JULY 2005
SOLICITATION FOR OFFERS
OUTPATIENT CLINIC
SFO NO. V101-183R-xxx-xxx-xx
[INSERT LOCATION OF FACILITY]
Exhaust fans shall be located close to the discharge air to maintain a negative air pressure in the exhaust
ductwork inside the building.
The fume hoods and biological safety cabinets for Laboratory //and Pharmacy// Service require dedicated
exhaust systems. Design exhaust systems based on the hood characteristics. The ventilation system for
the fume hood exhaust shall conform to the OSHA (Occupational Safety and Health Act), Regulation 29
CFR, Part 1910. The exhaust shall be continuously monitored and an alarm system (local audible and
visible alarm, and an alarm at the central engineering control center (ECC), if any, shall be provided for
each fume hood and biological safety cabinet.
The exhaust fans shall be selected to operate at low tip speed (approximately at half the maximum
permissible tip speed) and maximum static efficiency. Provide fan selection data on a performance curve.
Ensure that the fan discharge is directed vertically upward and the discharge velocity of 4,000 fpm is
maintained. Keep air velocity through the exhaust ducts within the ASHRAE recommended range of 1000
to 1200 fpm. Select backward inclined or forward curved blade fans. Perform sound analysis for each
exhaust fan and provide sound attenuation, if required. Use prefabricated sound attenuators or lined
ductwork. To ensure design airflow, a pressure independent, factory-set, field-adjustable, automatic airflow
control shall be provided for each fume hood and a biological safety cabinet.
Editing Note: Review and edit for type(s) of hoods and
safety cabinets necessary to meet program
requirements.
Hood types shall be as defined in VA Master Construction Specification//s 11604 Biohazard Safety
Cabinets and// 11610 Laboratory Fume Hoods.
//Provide a dedicated exhaust system for each Radioisotope hood. Provide a HEPA filter in exhaust air
duct prior to discharge at or above the highest point of the building.//
Provide a dedicated exhaust system to serve not more than four general purpose fume hoods.
"Conventional" or "by-pass" type hoods use all room air as the make-up air for exhaust. "Auxiliary air" type
hoods use 60 percent auxiliary make-up air directly ducted to the hoods and remaining 40 percent air
comes from the room for their exhaust needs.
Provide a dedicated exhaust system for each Type B1, B2 & B3 safety cabinets. A biological safety
cabinet protects the researcher, and in some configurations, the research materials as well. Biological
safety cabinets are sometimes called safety cabinets, ventilated safety cabinets, and glove boxes. These
safety cabinets are categorized into three classes and six groups. The National Sanitation Foundation
(NSF), Standard 49, has divided the Biological Safety Cabinets (BSCs) into Class I, II, and III Cabinets.
Class II Cabinets are of four different types, namely A, B1, B2, and B3. These hoods are available in two
sizes (nominal): 4 ft and 6 ft. Class II offers personal, product, and environmental protection compared to
the limited protection offered by Class I and are, therefore, more in use. Class III Cabinets are rarely used.
All Class II Cabinets require HEPA filters for the downflow and exhaust air system.
Provide a dedicated exhaust system for each B1 or B2 hood, i.e. each hood must have its own
independent exhaust fan and duct work. The ductwork shall be stainless steel or optional PVC coated
galvanized steel.
Provide a dedicated exhaust system for each Type B1, B2 & B3 safety cabinets.
//Perchloric Acid Hoods require dedicated exhaust systems with the following specific requirements:
Ductwork shall be stainless steel (type 316) welded construction. Fan shall be acid resistant metallic or
metallic covered with inorganic (polyurethane) coating, and explosion proof motor. Ductwork shall be short,
straight, with minimum horizontal runs, manifolds, and sharp turns. The exhaust duct shall terminate by
Part I: Basic Solicitation Requirements Page 99 of 169
Lessor __________ Gov't. __________
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