Reagent Grade Water Treatment Rooms

return room air back to the air-handling unit when the hood is not in

operation.

4.3 ELEVATOR MACHINE ROOMS

See Article 2.10.5

4.4 EMERGENCY GENERATOR ROOMS

See Article 2.10.6

4.5 FLAMMABLE AND COMBUSTIBLE LIQUID STORAGE SPACES

4.5.1 GENERAL

The mechanical ventilation system shall be designed in accordance with

NFPA-30.

4.5.2 HVAC REQUIREMENTS

(a) Each flammable and combustible liquids storage space shall have its

own dedicated exhaust system. The exhaust fan shall discharge at a safe

distance above the highest point of the building to prevent

recirculation.

(b) Exhaust air at the rate of 0.27 Cu M/Sq M (1.0 CFM/Sq. Ft) with a

minimum of 4.5 Cu M/Min (150 CFM).

(c) Exhaust fan shall be on emergency power.

(d) Locate the exhaust and make-up air inlets 300 mm (12 inches) above

the finished floor on the opposite side of room to avoid short-

circuiting of air.

(e) Provide an explosion proof motor and spark-proof fan. The fan

bearings should not come in contact with the exhaust air stream.

(f) Provide an airflow switch to detect interruption in airflow with

audible and visible alarms, local as well as at the Engineering Central

Center.

4.6 REAGENT GRADE WATER TREATMENT ROOMS

4.6.1 GENERAL

These rooms, generally located near Supply-Processing and Distribution

(SPD) or Laboratories, contain equipment that produces de-ionized

water. The room should be well ventilated because of corrosive

chemicals used in the process to produce deionized water.

4.6.2 EXHAUST AIR SYSTEMS

The exhaust system shall have the following specific features:

(a) Maintain a minimum of exhaust at the rate of 8 air changes per

hour.

(b) Exhaust fan shall be on emergency power.

(c) The exhaust systems shall have corrosion-resistant all welded

stainless steel ductwork spark-proof construction fans and explosion

proof motors.

HVAC DESIGN MANUAL

4-2

HVAC REQUIREMENTS FOR UNOCCUPIED AREAS