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Page Title: RETURN AIR FILTER, RETURN (INLET) LOUVERS, AND OUTLET LOUVERS. (cont)
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TM 5-4120-369-14
4-19.
RETURN AIR FILTER, RETURN (INLET) LOUVERS, AND OUTLET LOUVERS. -
Continued
Service the return air filter as follows:
b.
WARNING
Cleaning solvent, Federal Specification P-i) -680, Type II,
used for cleaning electrical parts, is flammable and gives
off poisonous vapors.  Use only in a well ventilated area.
A void prolonged breathing of vapors. Keep solvent and
vapors away from open flame.  Do not use in excessive
amounts.
(1) Clean filter with cleaning solvent (Federal Specification P-D-680) if lubricating oil
is used as the dust collecting adhesive.  Clean filter with water if a water soluble filter coater
(Appendix D) is used as the duct collecting adhesive.  Flush the filter with sol vent or water in
opposite direction of air flow.  Be careful not to damage filter during cleaning. Replace filter if
the frame is bent or the filtering material is damaged.
(2) Shake excess solvent or water from filter and allOW to dry thoroughly. If available,
low pressure compressed air (15 psig) can be used to speed drying. When using compressed air
for drying filter, always direct the air stream in the opposite direction of the filter air flow. Hold
the air nozzle a safe distance away from the filter to prevent compressing or separating the filter-
ing material.
(3) Coat the filter with a dust collecting adhesive (see Appendix D) by immersion or
spraying.  Make sure that the total air filtering surface is thoroughly covered with the adhesive
when spraying the filter.  Allow excessive adhesive to drain before installing filter.
Installation.
c.
(1) Slide the air filter into four filter retaining clips.
(2) Install evaporator inlet louver.
(3) Replace the 8 screws and washers.
(4) Install evaporator outlet louver.
(5) Replace the 8 screws and the 4 washers.
4-14

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