A-A-50032B
Type II- Hazardous location
Class 1- Direct drive
Style A- Wall or window mounting
Sizes- 12 and 18 inch (nominal propeller diameter)
Style B- Roof or ceiling mounting
Sizes- 16 and 24 inch (nominal propeller diameter)
1.2 CID based part identification number (PIN). A document based PIN to identify types, classes, styles, and sizes of fans is included in section 5. This identification numbering procedure is for Government purposes and does not constitute a requirement for the contractor.
2. SALIENT CHARACTERISTICS.
2.1 Standards compliance. All cords, wire, plugs, receptacles, fittings, and controls shall conform to the following UL Standards, as applicable:
No. 62- Flexible Cord and Fixture Wire
No. 498- Attachment Plugs and Receptacles
No. 507- Electric Fans
No. 508- Industrial Control Equipment
No. 698- Industrial Control Equipment for use in Hazardous (Classified) Locations
2.2 Motor. The motor for the type I fans shall be totally enclosed of the fan duty type, and shall conform to NEMA MG 1. The motor for the type II fans shall be of the explosion proof type for operation in hazardous locations as defined by NFPA No. 70. The motor shall be for continuous operation for the voltage, frequency, and phase characteristics specified (see 5.2).
2.3 Fan characteristics. The fans shall have the characteristics listed below:
|
Class |
Nominal propeller diameter (inches) |
Nominal capacity- C.F.M. at zero inches water |
|
1 (direct drive) |
12 16 18 20 24 |
1000 1600 2500 3200 4700 |
|
2 (belt drive) |
24 48 |
6800 22000 |
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