5.0 Installation Instructions
5.1 Location
Within the laboratory, pharmacy, etc., the ideal location of the biological safety cabinet is away from personnel traffic lanes, air vents (in or out), doors and/or any other source of disruptive air currents.
If drafts or other disruptive air currents exceed the inflow velocity of the cabinet through the access opening, the potential exists for contaminated air to exit or enter the work zone area of the cabinet. It depends on the severity of the air current. REMEMBER: A BIOLOGICAL SAFETY CABINET IS NO SUBSTITUTE FOR GOOD LABORATORY TECHNIQUE.
Where space permits, a clear 12" (305mm) area should be permitted on each side of the cabinet for maintenance purposes. The electrical outlet into which the cabinet is connected should be readily accessible for maintenance purposes. A MINIMUM CLEARANCE OF 6" (152MM) IS REQUIRED FROM THE TOP OF THE CABINET TO THE CEILING FOR PROPER VENTILATION OF THE EXHAUST EFFLUX.
If this cabinet is used in a pharmacy application, Per OSHA, NIOSH, and ASHP, it is strongly recommended that the cabinet be exhausted to the outside. In addition, if this cabinet is used in microbiological application with minute quantities of volatile toxic chemicals and tracer amounts of radionuclides, Per CDC/NIH and NSF it is strongly recommended that the cabinet be exhausted to the outside. NuAire offers a canopy type of exhaust transition, which will capture the exhaust efflux from the cabinet.
Canopy, Thimble or Air Gap Exhaust Transitions (with and without integral fan)
5.2 Set-Up Instructions
Remove outer shipping protection (carton or crating). The cabinet is fastened to the base skid and it is usually the best procedure to leave the skid in place until the cabinet is located in its approximate position to facilitate ease in handling. It can then be removed from the skid by removing the banding, bolts and screws holding the cabinet to the skid. It may be necessary to remove the Control Center in order to gain passage through a doorway. It may easily be removed by following the instructions on drawing BCD-05145.
5.2.2 Leveling
Using a level placed on the work tray, adjust the leg levelers, first, end to end, then, front to back. The NSF approved leg levelers provide a ± 3/4" (20mm) adjustment.
5.2.3 Bench Installation (BCD-05154)
Place the cabinet on the bench with approximately a 2" (50mm) overhang clearance for installation of the drain valve. If the drain valve is not desired, place the cabinet in its desired location and using RTV sealant seal all around the base of the cabinet and the bench. This provides a tight seal to prevent bench spills from migrating under the cabinet.
If a drain valve is desired, remove the handle from the valve stem to gain clearance for valve body rotation. Add Loctite 242 (furnished) to the threads and rotate valve body until secure, with the valve stem (for handle) on the left side. Re-install handle to valve stem. Adjust the cabinet on bench to provide a 1-1/2" (38mm) overhang and seal the interface of the bench and cabinet, using RTV sealant as above.
5.2.4 Gas Service
NuAire doesn't recommend the use of natural gas within the BSC, but if gas service is determined to be necessary for the application, appropriate safety measures must take place. All NuAire BSC's have precautionary warning labels that say the following:
CAUTION
Use of explosive or flammable substances in this cabinet
should be evaluated by your appropriate safety personnel.
Once the determination has been made by the appropriate safety personnel, the application of natural gas must be performed in accordance to national, state and local codes. IT IS ALSO STRONGLY RECOMMENDED THAT AN EMERGENCY GAS SHUTOFF VALVE BE PLACED JUST OUTSIDE THE BSC ON THE GAS SUPPLY LINE.
All NuAire BSC's meet the safety requirements of UL and CSA for Laboratory Equipment. To comply with these safety requirements, NuAire uses only certified gas valves. In addition, if external piping is required, only black pipe is used for this application.
As previously stated NuAire doesn't recommend the use of natural gas within the BSC and ASSUMES NO RESPONSIBILITY FOR ITS USE. USE AT YOUR OWN RISK. The Bunsen burner flame within the BSC not only contributes to heat build-up; is also disrupts the laminar air stream, which must be maintained for maximum efficiency. IF THE PROCEDURE DEMANDS USE OF A FLAME, A BUNSEN BURNER WITH ON DEMAND IGNITION IS STRONGLY RECOMMENDED. DO NOT USE CONSTANT FLAME GAS BURNERS. During use, the Bunsen burner should be placed to the rear of the workspace where resulting air turbulence will have a minimal effect.
5.2.5 Plumbing Services
Service ball valves with the type of service specified by the removable button on the handle are located
in the work zone. The service ball valves are not recommended for pressure over 75 p.s.i. (5.2 BAR). Reducing valves should be installed external to the cabinet if necessary. Service ball valves should never
be used for flammable gasses or oxygen service. A special needle valve for oxygen service or certified
valve is required and available upon request.
External connection is to 3/8 inch NPT coupling in the inner sidewalls. Connection to plant utilities
should be made with proper materials for the individual service and according to National and/or Local codes. Observe all labels pertaining to the type of service and operating pressure