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|  MIL-T-81527B(AS)
(c) Distribution Ducts
(d) Plenum Chamber
3.4.1.6.2.7.7.1 Centrifugal Fan. The Fan shall be designed to operate
continuously and shall deliver sufficient air to comply with performance
requirement specified in 3.4.1.6.2.7.6. The unit shall be 16-1/2
inches by 25-5/6 inches by 20 inches including the air inlet and exhause unit.
The air inlet and exhaust shall be a nominal 4-1/2 inches in diameter.
Weight shall not exceed 275 pounds.
3.4.1.6.2.7.7.2 Transition Unit.
The Transition Unit shall contain an
acoustical baffle and air filter.
This unit shall mate the air inlet of the fan
through a 9-1/2 inch long duct to an 18-inch by 12-inch air inlet.
The air
acoustical foam baffle shall reduce the fan acoustical noise to or below the
level specified in 3.4. 1.6.2.7, 5.
3.4.1.6.2.7.7.3 Distribution Ducts.
The air exhaust of the Centrifugal
Fan shall mate with a series of ducts which shall divide the air supply into
One part shall supply the RF Section Support Assembly and the
two parts.
other part shall supply the Plenum Chamber.
The Plenum Chamber shall be installed
3.4. 1. 6.2.7.7.4 Plenum Chamber.
below the Bench Top directly underneath the Pallet Shaft Assembly. The
Chamber shall not exceed 12-1/4 inches by 6 inches by 5 inches and shall
distribute air from the Blower Assembly to the AN/APG-59, Radar Set
Unregulated Power Supply, PP455l/APG-59, and to the Pallet Shaft
Assembly through an appropriate duct. A differential pressure switch shall
mount to one end of the Plenum Chamber to sense static pressure differential
between the Plenum Chamber and outside ambient air. The switch shall
activate when the air pressure decreases to 5.50 + O. 25, -0.00 inches of
water and shall be electrically connected to the CMPTR AIR, indicator in
series with a sensing element installed in the Plenum chamber of the
Computer Support Structure.
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