depend upon the size and function of the equipment used in the laboratory.
The following systems are to be provided:
(a) GENERAL EXHAUST: Provide an exhaust air duct connection from the Infra
Red Curing Oven. The oven is equipped with an integral blower. The blower
picks environmental air to discharge into the general exhaust duct.
Provide an air gap between the blower discharge duct and the general
exhaust duct. This oven is a VA furnished and VA installed item.
(b) SPECIAL EXHAUST
(1) Provide a dedicated exhaust system to remove toxic chemical fumes,
generated by plastics and resins, over the plastics work area table.
(2) The work area table shall be provided with a canopy hood (Type A, B,
or C). The exhaust air quantity shall be based on 0.26 to 0.51 m/s (50 to
100 fpm) face velocity over the hood area.
(3) The ductwork shall be of corrosion resistant material or stainless
steel. The fan shall be of spark-proof construction material with
explosion proof motor.
(4) The exhaust air shall be discharged at the highest point above the
building.
(5) Special exhaust fans shall be on emergency power. See Article 2.16.
(c) WELDING EXHAUST: For welding area, provide a pre-fabricated,
engineered exhaust system complete with special air inlets, flexible
ductwork, solid sheet metal ductwork, exhaust fan, etc., to make a
complete system. The size and capacity of the welding system depends upon
the extent of welding activity, the number and locations of the special
air inlets and special requirements, if any, of the medical center.
3.13.6 DRY LABORATORIES
Some of the total laboratory unit space may be designated as "Dry
Laboratories" on a project-to-project basis. Although dry laboratories
contain standard laboratory casework, they do not require any fume hoods
or any special HVAC requirements such as 100 percent outdoor system or
negative pressure etc. These labs are used only for research and may
contain some electronic equipment. HVAC systems for these labs shall be
similar to that of conference rooms.
3.14
LAUNDRY (CENTRAL) FACILITY
3.14.1 GENERAL
3.14.1.1 Provide ventilation, evaporative cooling or mechanical cooling to
in the Laundry to maintain following temperatures and pressure.
Summer: 28 degrees C (84 degrees F) Db, 60 percent RH
Winter: 19 degrees C (68 degrees F) Db, uncontrolled humidity
Pressure: Negative
degrees F). Unit heaters may be used for this propose.
HVAC DESIGN MANUAL
3-11
HVAC REQUIREMENTS FOR OCCUPIED AREAS
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