Item 2,
FLOW SAFE VORTEX II MODELS

LIST PRICE OF ORDER

% DISCOUNT
EQUIPMENT

% DISCOUNT
ACCESSORIES

SETTING
IN PLACE

FOB

$0 to $24,999.99

35%

35%

$25,000 to $50,999.99

40%

40%

$51,000 to any amount

45%

42%

Add'l costs per hood

$1,500.00

D

Manufacturer's published price list used (by name or date): Flow Safe Fume Hood Price List 03/2013

B.11.1

Sash frame shall be metal construction with chemical resistant finish, enclosed in an upper metal sash pocket. The metal sash pocket assembly shall be bolted to the hood structure.  

B.11.2

Vertical sash movement shall allow hood loading and horizontal movement to provide a safety body shield when needed.  Air gap between sash and sash pocket shall be no more than 1/8 inch.  Horizontal sliding sashes shall be mounted on two tracks supported from top rail by rollers.

B.11.3

All glass panels shall have finger pulls on each horizontal panel and shall have edge guards on all vertical edges of each horizontal panel.  Bottom edge of vertical sash frame shall have full length finger pull with dynamic turning vane airfoil design.

B.11.4

Back single counterweight system shall include weights, stainless steel cables (with minimum  safety factor of 10, and not exposed to exhaust vapors) and sash guides, steel pulleys with cable retaining device.  Counterweight system shall be balanced to provide smooth operation of the sash at any point along the full width of the bottom sash pull.

B.11.5

Sash height limiting hardware shall be provided, mounted on exterior of the hood, to prevent raising the vertical sash unintentionally above setpoint.

B.11.6

Work surface shall be a modified epoxy resin 1"- thick surface, dished at least 1/4” to contain spills, default color: black. A secured corrosion resistent  screen should be provided to prevent debris (tissue, lab gloves) from entering the lower exhaust slot and to prevent the lower exhaust slot from material storage. The screen should be 18-16 gauge and rest on the work surface and positioned with corrosion resistent stays.

B.11.7

The bi-stable vortex control system shall be factory installed and wired on the Vortex II fume hood. Sensor should be mounted on the inside sidewall and be accessible for inspection and  repair.

B.11.8

The vortex control system shall include:

• Dedicated VFV vortex pressure transducer controller
• VFV electronic actuator
• Dedicated VFV hood alarm module
• Linear Trunnion damper

B.11.9

The baffle control system shall correct for fume hood loading, downdrafts, sash movements  and activity in front of the hood to maximize fume hood containment.

B.11.10

Contractor's representative shall set up and calibrate baffle control system upon completion  of installation.

B.11.11

The lower airfoil shall have a 1-inch diameter stainless steel safety bar offset from the  upstream edge of the airfoil by 4-inches to the upstream edge of the safety bar. The safety bar shall be secured from rotation and lateral movement with tamper proof stainless  fasteners.

B.11.12

The fume hood should have a stainless steel rectangular catch basin and ¼” ID tygon drain  tube to catch small water leaks associated with the exterior mounted atmospheric (ATM)  vacuum breakers. The drain tube shall be directed to the fume hood cup sink. The catch sink is installed to protect fume hood operators and electrical circuits from water spills from opening and closing the sidewall hot and cold water outlets.

B.11.13

Optional Vacuum Pump Cabinet (VPC0. If the fume hood is provided with an optional  vacuum pump cabinet, the cabinet shall have the following construction. The cabinet frame shall be all steel painted construction per fume hood steel panels as detailed in this specification.. The space directly above the VPC shall also be steel construction. The access door shall have an interior 110-cfm fan pushing air into the cabinet (supply air) to cool the  vacuum pump. A stainless relief louver 12” by 18” shall be installed in the access door to  direct heated cabinet air back into the laboratory.  The fan shall be mounted on the interior  face of the relief louver lower edge centerline with a two pole cord to the duplex outlet for the vacuum pump. The flexible cord shall be secured to the cabinet sidewall and shall not contact the door thresholds.  The switch to energize the pump motor and cooling fan shall be  mounted in the space directly above the VPC. The switch shall be rated for 20-Amperage  and will have a red pilot light with a warning  label VACUUM  PUMP & COOLING  FAN  (white letters/black background; Letters ½ in height) and located on the exterior front of the  vacuum cabinet door.  The VPC shall be acoustically insulated from the lab space and provided with a service cart and plastic drip pan designed for the pump and motor. All wheels  shall be full swivel, minimum 2” diameter soft rubber. The door kick plate should be painted  metal with exhaust holes. The kick plate should be removable in case additional heat removal is required. The penetration from the VPC to the fume hood work zone shall be at  least a three inch diameter vertical plastic pipe with a flanged plastic collar with two inch rise, sealed with silicone adhesive and removable rubber cap.

B.11.14

Optional Iris Port(s): A sidewall Iris pipe port with flexible septum in the work zone. The Iris  port shall be used to convey laboratory tubes and cord sets. The exterior portion of the Iris  port shall be located on the front left or right fume hood side post. Left or right sidewall location is only acceptable if there is at least 6-inch clear space between the fume hood sidewall and non-moveable objects. The interior section of the Iris port shall have a threaded plastic pipe end cap. The minimum inside diameter for the Iris tube should be 2” diameter  plastic pipe.

Item 1,
HAMILTON PIONEER

List price of order

% Discount
Equipment

% Discount
Accessories

Setting
in place

FOB

$0 to $200,000.00

38%

21%

$200,001.00 to $500,000.00

43%

27%

$500,001.00 and greater

Negotiable

Negotiable

Add'l costs per hood

$1,400.00

D

Manufacturer's published price list used (by name or date): Hamilton Scientific Price Deck 2011WI and is dated February 28, 2013 and numbered:  Hamilton Scientific – 2011WI Listing pricing – 13 List price (Hoods).pdf; Hamilton Scientific – 2011WI Listing pricing – 13 List price (Casework).pdf; Hamilton Scientific – 2011WI Listing pricing – 13 List price (Systems).pdf; and Hamilton Scientific – 2011WI Listing pricing – 13 List price (Entities).pdf;

B.10.1

Superstructure shall be a rigid, self-supporting assembly of double wall construction, maximum 4-7/8” (+/- ½”) wide.  Walls shall consist of a sheet steel exterior shell and a corrosion resistant inner liner, and shall house and conceal steel framing members, attaching brackets and remote operating service fixture mechanisms and services.

B.10.2

Exterior shell shall be high quality, cold rolled, mild steel meeting requirements of ASTM A366; gauges U.S. Standard and galvanized, finished with electro-statically applied reagent resistant urethane powder coat, minimum thickness 1.2 mils.  Panels must be attached to a full frame construction, with minimum 14 gauge galvanized members.  Panels and brackets shall be attached to eliminate screw heads and metallic bracketry from hood interior.

B.10.3

Overall depth of fume hood superstructure, not including directed airflow chamber, shall be 37-1/4 inches. For less than 37-1/4 inches application, the manufacturer shall offer an optional fume hood design that complies with paragraph B10.24. For fume hood depths greater than 37-1/4-inches the manufacturer shall comply with this specification.   

B.10.4

Inner liner shall be poly-resin reinforced polyester panel, with smooth finish and white color in final appearance.  Flexural strength shall be 14,000 psi.  Flame spread shall be 15 or less per U.L. 723 and ASTM E84-80.  All interior seams shall be sealed and caulked.

B.10.5

Access to fixture valves concealed in wall shall be provided by exterior removable access panels, gasket access interior panels on the inside liner walls, or through removable front posts. Gaskets shall be White 70 durometer PVC for interior access panels.  Interior access panels shall have gaskets to eliminate air leakage and to retain liquids inside hood.

B.10.6

Baffles providing controlled air vectors into and through the fume hood shall be fabricated of the same material as the liner.   Supports and brackets shall be non-metallic.  Minimal exhaust slots full height on vertical sides of the baffle shall be provided.  High performance 2-piece baffle shall be used.  Baffle shall incorporate exhaust slots located to purge the upper and lower area of the hood.  Baffle shall be non-adjustable, but removable for periodic cleaning and retrieval of debris. A corrosion resistant 16-18 gauge stainless screen ½” by ½” should be placed directly in front of the lower slot and attached with corrosion resistant fasteners secured to the lower fixed baffle. Screen should be highly visible to fume hood operators who will remove screen debris.  The screen will also exclude research materials from being stored inside the lower slot. Screen edges should be in at least a 1/2 inch frame finished with no sharp edges and corners rounded (1/4-inch radius).

B.10.7

Access opening perimeter shall have air foil or streamlined shape with all right angle corners radiused or angled.

B.10.8.

Bottom horizontal air foil shall be a triple vane design to minimize reverse flows and eddy currents at the work surface. Bottom air foil shall be steel with urethane powder coating to increase acid and abrasion resistance.  Air foil and sill shall be no more than ½” above the height of the work surface.  The air foil shall provide a nominal two inch bypass when sash is in the closed position with area between vanes sufficient in size to pass through electrical plugs.  Air foil shall not be removable without use of special tools and the airfoil shall be sealed to the fume hood countertop with 100% silicone sealant.

B.10.9

A steel safety bar with urethane powder coating shall be provided across the full width of the bottom air flow positioned to prevent users from directly blocking the air foil with their body.  The safety bar shall be located approximately 4 inches from the front edge of the bottom air foil and should not be removable without special tools. The safety bar shall be secured from rotation by recessed tamper proof corrosion resistant screws drilled into the safety bar and left and right bar holders. 

B.10.10

Exterior structural members attachments shall use sheet metal screws, zinc plated, blunt nose, with no sharp edges on the screw points.  Interior fastening devices shall be concealed.  Exposed screws shall not be acceptable. Exterior side access panel member fastening devices shall be exposed corrosion resistant, non-metallic material, creating a positive mechanical latch.  Latch must be flush type.  Exposed screws or Velcro type fasteners shall not be acceptable.

B.10.11

Work surface shall be a modified epoxy resin 1-1/4” thick surface, dished at least 1/4” to contain liquid spills, color: black.

B.10.12

Vertical sash and Combination (vertical and horizontal) sashes shall have a 27.5 inch high access opening along with a fixed top viewing panel to provide a 35” high overall sight line. The lower horizontal edge of the Vertical sash and Combination vertical sash shall have a metal airfoil to reduce turbulence.  The vertical and combination sash designs shall be restricted bypass. Sash frame on bottom and sides shall be no more than 1.5” wide, corrosion resistant steel with chemical resistant powder coating. The horizontal sash frame shall ride in extruded, chemically resistant sash guides.  Bottom edge of sash frame shall be formed to minimize air flow turbulence into the hood.  Horizontal sliding panels shall be 1/4” laminated safety glass, top hung on nylon tired stainless steel ball bearing wheels and sash edges provided with stainless rails (clines) to act as finger pulls and to prevent exposure to glass edges.  Horizontal sash panels shall be mounted to prevent removal.  Fixed top viewing panel shall be minimum 3/8” thick laminated safety glass.  Exposed glass edges of viewing panels and sash panes shall have stainless steel push on trim (clines) to protect operators from injury and prevent glass edges from chipping. All vertical sash and combination horizontal sashes shall be ¼-inch safety plate glass. Combination sashes shall have stainless steel clines on all vertical glass edges to protect against glass damaged. Provide chemically resistant flexible bumpers to protect the glass against breakage.
Sash Stop is required on all new vertical sash Pioneer fume hoods at 18 and 27.5 inches from the countertop in the work zone. The sash stop shall automatically release by raising the sash off the stop. The stop shall have a plastic knob mounted on a pivoting steel shaft. The 18 inch sash stop shall be by definition a plastic laminated label affixed by the manufacturer and called: SASH STOP  

B.10.13

Sash counter balance system shall be sprocket and chain drive with single weight, shall be self-leveling, prevent sash tilting, and permit ease of operation at any point along full width pull.  Pull required raising or lowering sash throughout its full length of opening shall be a maximum of seven pounds.  Sash and weight shall be life cycle tested. Sash shall open and close against rubber bumper stops that can be replaced without disassembly of the sash.

B.10.14

Sash chain and pulley assembly: Sash chain shall be ANSI #35 steel, single strand with an average tensile strength of 2,400 pounds, and maximum working load of 480 pounds.  Pulley assembly for sash chain shall be finished bored steel drive sprockets and keyed drive, 1/2” diameter, with front connector shaft, rear idler sprockets; and double sealed lubricated type ball bearings.  All sprockets shall be steel with zinc dichromate finish.

B.10.15

Auto-mechanism shall be designed to promote usage of sash as an upper body and face shield.  Sash operating position shall be based on the combination sash fully lowered with horizontal panels opened to the desired configuration of the user.  Combination sash shall have the capability to be raised to full 27.5” vertical opening for loading, unloading and setup of large apparatus.  A lock-open lever with a smooth plastic handle and painted metal rod 1/4-inch diameter shall be provided.  When lock-open is not engaged, the combination sash shall lower automatically to a nominal 18” position when released.  Auto-sash function shall be life cycle tested and not incorporate the need for motor drives.

B.10.16

An integrated visual sash alarm light, separate from the safety monitor and alarm specified in Section B6, shall illuminate when the vertical sash is raised above 1 inch from the fully closed position.

B.10.17

An integrated audible sash alarm, separate from the safety monitor and alarm specified in Section B6, shall annunciate identical to an automobile seat belt warning, in sound level and periodicity, when the vertical sash position is raised above the 18 inch open position.

B.10.18

When the vertical sash is raised an airflow chamber shall assist fume hood containment by vertically directing room air between the operator and the hood from above the vertical sash opening.  Chamber shall be low resistance, 18 gauge steel with integral distribution media and polycarbonate honeycomb flow straightener at outlet.  Blower shall be an integral part of the chamber with dual forward curved wheels.  Motor shall be shaded pole, low horsepower rated for a 30,000 hour duty cycle.  Housing shall be powder-coat finished and vibration isolated.  The blower shall activate automatically when the vertical sash is raised above the 18 inch open position. The upper vertical sash assembly shall be totally enclosed in a removable sash pocket, painted and secured with fasteners. The total height of the fume hood and sash pocket shall be no less than 110 inches (+/- 1 inch). There shall be no ceiling attachments to the sash pocket. It is understood that if the fume hood is installed in a low ceiling location the fume hood can be provided with an optional blank off plate and the hood will have no operable vertical sash and all work shall be confined to the horizontal sashes which shall be fully functional and pass an As Installed ASHRAE 110-95r gas containment test.

B.10.18.1

The sash pocket shall have a front removable access panel for maintenance that extends the full length of the sash pocket minus three inches on the left and right sides, top and bottom. On the rear wall of the sash pocket provide a removable 24 inch square panel to access the sash position alarm and sprocket drive. A removable 24 inch panel to access the electrical box and (DAT) transducer alarm. Sash pocket panels shall be painted and secured with stainless sheet metal screws.  

B.10.19

The fume hood shall be provided with an independent face velocity monitor   mounted on the left or right exposed upper side post face. The monitor shall have a cleanable velocity  sensor which shall also be mounted on the front side post and shielded in a plastic  protective housing. Access to the sensor via the interior sidewall access panel is unacceptable.

B.10.20

The fume hood should have a small stainless steel rectangular catch basin and ¼” ID clear tygon drain tube to catch small water leaks associated with the exterior mounted atmospheric (ATM) vacuum breakers used for water supply to the fume hood interior.  The drain tube shall be directed to the fume hood cup sink or work surface. The catch basin  is required to protect fume hood operators and side post electrical circuits from water spills. The discharge end of the drain tube shall terminate in a ½” plastic pipe 45 degree  elbow secured to the fume hood sidewall. There shall be no exposed tygon drain tube.  The clear flexible drain tube shall be ½” outside diameter with 1/8” sidewall.

B.10.21

Optional Vacuum Pump Cabinet (VPC): If the fume hood is provided with an optional VPC,  the cabinet shall have the following construction. The cabinet frame shall be all steel painted  construction per fume hood steel panels as detailed in this specification. The space directly  above the VPC shall also be steel construction. The access door shall have a 110-cfm heat  resistant fan designed to push tempered air into the cabinet (supply air) to cool the vacuum pump. A stainless relief louver 12” by 18” shall be installed in the access door to direct  heated cabinet air back into the laboratory.  The fan and fan plenum shall be mounted on the interior face of the cabinet door lower edge centerline with a two pole cord to the interior duplex outlet for the vacuum pump. The flexible cooling fan cord shall be secured to the  cabinet sidewall and shall not contact the door thresholds. 

B.10.21.1

The switch to energize the vacuum pump motor and cooling fan shall be mounted in the space directly above the VPC door. The switch shall be rated for 20-Amps and will have a red pilot light on the switch rocker.

B.10.21.2

VPC Operator Label: The motor and fan switch shall be provided with an operator warning label: VACUUM PUMP & COOLING FAN (Black letters/yellow background; Letters ½-inch height) and located on the exterior front of the vacuum cabinet door. The sign shall be  laminated plastic to protect the face from liquids. 

B.10.21.3

Insulation: The VPC shall be acoustically insulated from the lab space. The acoustical foam shall be fire retardant media.

B.10.21.4

Service Cart: The VPC shall be provided with a service cart and drip pan and curb designed for the pump and motor. Cart wheels shall be full swivel, minimum 2” diameter and soft rubber.

B.10.21.5

Kick Plate: The door kick plate shall be painted metal with four one inch diameter exhaust holes. The kick plate shall be removable in case additional heat removal is required. Kick plates for VPCs shall have an intake slot of at least 17” length by 1.5” width.

B.10.21.6

Counter Top Penetration: The penetration from the VPC to the fume hood work zone countertop shall be at least 3-inch inside diameter (ID) pipe sleeve that is directly connected from the VPC to the fume hood work zone with a sealed collar and removable flexible cap. The collar shall terminate at least ½” above the work zone counter top to contain spills.  The sleeve shall be secured to the work zone with chemically resistant threaded plastic rings and (100% Silicone) sealant and shall be liquid tight.

B.10.21.7

The under counter VPC is designed for motor heat removal. Therefore the vacuum pump and  pump exhaust tubing shall be routed into the fume hood work zone via the counter top  penetration as described in specification B10.21.6 or by the optional sidewall iris port if the  VPC is located adjacent to, but not under, the fume hood. The VPC is not designed to  contain particles, vapors or gases. WARNING: Direct these contaminants to the fume hood  work zone via the dedicated 3 inch pipe sleeve.  

B.10.22

Iris Port(s) Optional: A sidewall Iris pipe port with flexible septum in the work zone shall be optional. The Iris port(s) shall be used to convey laboratory tubes and electrical cords. The exterior portion of the Iris port shall be located on the front left or right fume hood side post. Left or right sidewall location is acceptable if there is at least 6-inch clear space between the fume hood sidewall and non-moveable objects. The exterior section of the  Iris shall have a threaded plastic pipe end cap, which is sealed when not in use. The minimum inside diameter for the Iris tube should be 2–¾-inch inside diameter  plastic pipe.

B.10.23

Optional chemical storage cabinets: For those fume hoods provided with VENTED under counter chemical storage cabinets to reduce odor, each cabinet shall be connected to a 1.5-inch diameter vent tube which penetrates and is sealed to the fume hood countertop. The tube shall also be sealed to the chemical storage cabinet in the rear side wall and terminate behind the fume hood baffle.

B.10.23.1

The sidewall vent tube shall have an exposed flame arrestor located in the cabinet rear  sidewall. The tube shall be connected to a plastic elbow connected to a straight section of 1.5–inch diameter plastic pipe that penetrates the counter top and terminates 47 inches vertically behind the rear baffle in the entry section of the exhaust transition. The flame  arrestor shall be exposed for periodic cleaning and replacement

B.10.23.2

Warning Label: The storage cabinet shall be labeled CHEMICAL STORAGE CABINET.  If two chemical storage cabinets are provided under the fume hood work zone, label one  cabinet CHEMICAL STOARGE CABINET-ORGANICS and the second cabinet CHEMICAL  STORAGE CABINET NON-ORGANICS.

B.10.23.3

The chemical storage cabinet shall have a chemically resistant drip tray with a 1  inch perimeter lip to contain accidental spills.   

B.10.23.4

Chemical storage cabinet(s) located under a fume hood shall not to be referred to  as Flammable storage cabinet(s), however in is understood that the installed cabinet  is designed to meet applicable NFPA standards.

B.10.24

The fume hood described in this specification is supplied in depths of 37-1/4-inches or greater. If a depth less than 37-1/4-inches is required because of limited isle space, an alternate model fume hood shall be offered by the manufacturer designed to pass containment at no less than 60-feet per minute full open sash and meet applicable paragraphs in this specification as determined by plan review by the university agent in charge of this specification.

B.10.24.1

The university agent shall be a Wisconsin licensed professional engineer with at least 10 years’ experience in the field of fume hood management and containment testing.

B.10.25

The fume hood manufacturer shall provide replacement parts for the fume hood for ten year from the initial purchase date.           

Item 3,
LAB CRAFTERS AIR SENTRY MODELS

List price of order

% Discount
Equipment

% Discount
Accessories

Setting
in place

FOB

$0 to any amount

40%

40%

Add'l costs per hood

$1,550

D

Manufacturer's published price list used (by name or date): AIR SENTRY PRICE SHEETS_UW 13 5763_JAN 2013

B.12.1

Superstructure shall be double wall construction cold rolled steel that will house and conceal structural interior steel walls and service mechanisms.  Inner steel wall, outer steel shell and inner liner shall be factory assembled as a rigid, self-supporting component.  Fume hood front section shall be removable to facilitate the hood’s access into its final location.

B.12.2

Overall depth of fume hood superstructure shall be 39 inches. The overall height of the fume hood and sash enclosure should be 110 inches (+1,-1 inch) which includes the MFG base cabinet height of 35 inches.

B.12.3

Exterior shell shall be 18 gauge reagent resistant polyurethane coated steel.  Color shall be selected from manufacturer's standard color chart by Architect/Engineer.

B.12.4

Inner liner and baffles shall be galvanized steel wall covered with 1/4" thick chemically resistant fiberglass reinforced polyester with smooth finish, color: white.  Liner shall be held in place with concealed fasteners, protected from corrosion. A self-supported 16-18 gauge corrosion resistant screen should be placed directly in front of the lower slot to remove accumulated debris.  The screen will also exclude research materials from being placed inside the lower slot and will facilitate lower exhaust baffle travel. Screen edges should be finished with no sharp edges or burrs and corners rounded (1/4” radius). For proper positioning of the screen, provide corrosion resistant stays to maintain the front to rear position.

B.12.5

Flush mounted removable access panels shall be provided on inside walls of liner and on outside side panels to allow ease of maintenance on valves and baffle actuator.

B.12.6

Hood front shall include posts, tracks, and sash with weight, pulleys, cable, foil, pre-piped plumbing fixtures and pre-wired electrical fixtures.  Hood front with sash and pre-wired electrical components shall be removable from hood body as a complete assembled one piece unit without disconnecting electrical components. If hot or cold water fixtures are called for, each fixture shall be provided with a face mounted atmospheric (ATM) vacuum breaker. The vacuum breaker(s) shall be mounted on the upper section of the left and/or right side post with a stainless catch basin and drain tube to the fume hood cup sink. The flexible drain tube shall drain by gravity and run inside the fume hood double sidewall, exit the interior sidewall via a tube fitting and into the cup sink. The drain tube shall not run across the fume hood air foils, cross the open sash opening or restrict sash travel.

B.12.7

The superstructure perimeter surrounding the sash opening shall have an airfoil design for optimal airflow entry and containment at hood face.  Hood post shall have airfoil design and not exceed 4-1/2 inches in width.

B.12.8

A multi-vector bottom airfoil mounted behind the sash and above the work surface shall be steel with a chemically resistant coating and shall have multi-channel slots. For ADA compliant fume hoods, a 2 inch deep trough below the airfoil shall be included to collect spills.  The slotted airfoil shall be capable of swinging up to pass line cords underneath and to clear spillage from trough.

B.12.9

A 316 stainless steel safety bar shall be provided across the full width of the bottom air flow positioned to prevent users from directly blocking the air foil with their body.  The safety bar shall be located approximately 4 inches from the front edge of the bottom air foil and be attached with tamper proof fasteners to prevent rotation.

B.12.10

Sash shall be a combination horizontal/vertical sash withlaminated safety glass.

B.12.11

Overall vertical sash viewing height shall be 34 inches with a 7 inch high clear fixed panel along the top of the opening.  Overall vertical sash opening height shall be 27 1/2".

B.12.12

Vertical sash shall be narrow 1-1/2” design and have built in horizontal sliding sashes that ride on rollers supported from the top rail in two tracks.  Bottom edge of vertical sash shall have full length stainless steel pull with turning vane design. Clear fixed viewing panel and horizontal sash panels shall have stainless steel or plastic trim on all exposed edges to protect operators from injury and prevent glass edges from chipping.

B.12.13

Sash frame shall be aerodynamic radius design, reinforced to support added weight and shall have a mechanism to allow it to move below the counter top.  Sash frame shall be steel construction with chemically resistant coating.

B.12.14

Counterweight system shall include single weight, non-coated military spec 1/8-inch stainless steel cables and sash guides, ball bearing type nylon pulleys with cable retaining device.  System shall be designed to prevent sash drop in the event of cable failure.  Counterweight system shall be balanced to provide smooth operation of the sash at any point along the full width of the bottom pull and prevent sash creep at any position.  Sash assembly shall be enclosed in the front 12 inches of the hood assembly and shall be easily removed with less than ten fasteners for service and transport into the lab.

B.12.15

Work surface shall be a modified epoxy resin 1" thick surface, dished at least 1/4” to contain spills, color: black.

B.12.16

The vortex control system shall be factory installed and wired on the fume hood.

B.12.17

The vortex control system shall include:

• One (1) Controller/Monitor with Vortex Sensor
• One (1) Baffle Actuator

B.12.18

The vortex sensor component shall be surface mounted in the fume hood sidewall and shall detect pressure difference between a stable and unstable vortex which is the direct indication of the fume hood performance.

B.12.19

The baffle controller shall be mounted on the fume hood post and shall control the electric servo motor that actuates automatic back wall baffles to maintain a stable vortex in the fume hood.

B.12.20

The electric servo actuator motor shall be 24VAC, 0-10 VDC input, 90 degree angle of rotation, current limited.

B.12.21

The fume hood shall be provided with an independent face velocity monitor   mounted on the left or right exposed upper side post. The monitor shall have a cleanable velocity sensor which shall be mounted on the front side post or sidewall and shielded. Access to the sensor via the interior sidewall access panel is unacceptable.

B.12.22

Optional Vacuum Pump Cabinet (VPC) with sensible cooling. If the fume hood is provided  with an optional VPC, the cabinet shall have the following construction. The cabinet frame  shall be all steel painted construction per fume hood steel panels as detailed in this  specification. The space directly above the VPC shall also be steel construction. The access door shall have an interior mounted 110-cfm fan pushing tempered air into the  cabinet (supply air) to provide sensible cooling to the vacuum pump space. A stainless  relief louver shall be installed in the access door to direct heated cabinet air back into the  laboratory.  The fan shall be mounted on the interior face of the relief louver lower edge  centerline with a two pole cord to the duplex outlet for the vacuum pump. The flexible cord  shall be secured to the cabinet sidewall and shall not contact the door thresholds.  The  switch to energize the pump motor and cooling fan shall be mounted in the space directly  above the VPC. The switch shall be rated for 20-Amperage and will have a red pilot light  with a warning  label VACUUM  PUMP & COOLING  FAN (Black letters/Yellow background;  Letters ½ in height) and located on the exterior front of the vacuum cabinet door.  The VPC  shall be acoustically insulated from the lab space and provided with a service cart and drip  pan designed for the pump and motor. All wheels shall be full swivel, minimum 2” diameter  and soft rubber. The door kick plate shall be painted metal with a 17” by 1.5” entry slot into  the fan plenum. The kick plate can be removable in case additional heat removal is required  for larger vacuum pumps. The penetration from the VPC to the fume hood work zone for  hoses shall be at least a three inch diameter tube/sleeve. The sleeve shall be secured to  the work zone with sealant and fasteners and removable plastic cap.

B.12.23

Iris Port(s) Optional: A sidewall Iris pipe port with flexible septum in the work zone shall be  optional. The Iris port shall be used to convey laboratory tubes and electrical cords. The  exterior portion of the Iris port shall be located on the front left or right fume hood side post.  Left or right sidewall location is acceptable if there is at least 6-inch clear space between the  fume hood sidewall and non-moveable objects. The exterior section of the Iris shall have a   threaded plastic pipe end cap. The minimum inside diameter for the Iris tube should be 2” diameter plastic pipe.