RETURN AIR LOUVER AND AIR FILTER.-Continued

TM5-4120-384-14

RETURN AIR LOUVER AND AIR FILTER.-Continued

4-13.

(2) Immerse filter in mild

detergent

solution

dry

cleaning

solvent (Fed Spec P-D-680).

(3) Agitate until dirt is removed,

using

soft

brush

necessary to loosen caked-on dirt.

(4)

Rinse

clear

water

clean

dry

cleaning

solvent.

(5) Drain, then hold filter horizontal

and

tap

each

edge

bench or floor to dislodge droplets.

(6)

sure

filter

totally

dry

prior

installation.

Inspect.

(1) Check the louver for general condition. Bent louvers can

usually be straightened with the fingers. Refer further repair or

replacement to direct support.

Perforations or punctures in

(2) Inspect filter for damage.

screen and aluminum foil mesh can permit passage of unfiltered air.

(3) Inspect

for packed

crushed

mesh

material

obstructing

airflow through

filter.

(4) Check for deformation of the frame.

Straighten

possible without crushing mesh material.

(5)

Replace

filter

crushed,

punctured,

badly

deformed,

broken.

Servicing.

Apply a few drops of light oil to all pivot

(1) Louvers.

Wipe or blot up all excess

points and bearing

surfaces of louvers.

oil with a cloth.

(2) Filter.

Apply coater (Item

1, Section II, Appendix E)

Let

dry and wipe off excess

the media in the filter element.

coater.

Installation.

(1)

Air

flow

arrows

should

point

away

from

louver.

(2)

Place

filter

retainer

clips.

(3)

Secure

louver

with

screws

and

lock

washers.

4-44