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 TM 55-1905-220-14-11
5-140. HVAC DUCTING - MAINTENANCE INSTRUCTIONS (Continued).
LOCATION
ITEM
ACTION
REMARKS
REPAIR OR REPLACE (Cont)
bn. 3 inch
Repair or replace.
spiral
duct (60)
bo. Hex head
Repair or replace.
cap screw
(61)
bp. 180" NPT
Repair or replace.
return
(62)
bq. 2 inch
Repair or replace.
pipe
(63)
br. 2 inch
Repair or replace.
elbow
(64)
bs. 2 inch
Repair or replace.
flame
arrestor
water-
tight
closure
(65)
bt. Flange
Repair or replace.
plate
(66)
bu. Reducer
Repair or replace.
(67)
bv. 6 inch
Repair or replace.
return
(68)
bw. 6 inch
Repair or replace.
wire mesh
watertight
cover (69)
Change 1
5-1468
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