background image

3. Grasp media pack with right hand, about six in. from closest

end, with cardboard strips on top. Fan pleats open with other
hand underneath and start one pleat in each slot of wire media
frame, working from right to left. There are 37 pleats and 37
slots.

4. When all pleats are started, slide media pack endwise into the

wire media frame until holes in carboard end seals line up with
holes in side frames. Make sure pleat ends are even. Press
pleated paper down gently on all areas of wire frame. (See Fig.
5.)

5. Install plastic pleat spacers, being careful to insert one support

finger between each pleat. Press the pleat spacers down firmly
to fully engage guide pin at each end. (See Fig. 6.)

6. Slide assembled media frame into air cleaner cabinet. Be sure

airflow arrow on media frame is in same direction as arrow in
cabinet. Plastic pleat spacers are always on downstream side
of filter media. Attach outer cover and tighten thumb screws.
(See Fig. 7.)

Fig. 4—Air Cleaner Filter Gage Assembly

A90296

CONDITION
INDICATOR
CARD

SPRING GAGE 
HOLDER
(MOUNTED)

MOUNTING STUD

ADJUSTMENT

PLUG

AIR CLEANER

FILTER GAGE

BALL

Fig. 5—Insertion of Pleated Media in Media Frame

A90319

Fig. 6—Placement of Plastic Pleat Spacers

A90320

Fig. 7—Media Frame Positioning

A90325

3

Summary of Contents for 31MF

Page 1: ...nd property damage INTRODUCTION The Model 31MF High Efficiency Mechanical Air Cleaner is designed for installation in the return air duct of any forced air heating and or cooling system It is designed for use in systems with airflow up to 2000 cfm For higher airflows additional units may be required The Model 31MF is a mechanical air cleaner incorporating 78 sq ft of glass microfiber filter media ...

Page 2: ...t airflow gage by rotating range adjustment plug until ball hovers at tip of lower arrow See Fig 4 When the air cleaner media begins to become clogged and dirty the ball will move up the gage When the ball is in the red range shown on the condition indicator card the air cleaner should be serviced Step 3 Install Filter Media in Air Cleaner Cabinet NOTE These instructions should also be followed wh...

Page 3: ...c pleat spacers being careful to insert one support finger between each pleat Press the pleat spacers down firmly to fully engage guide pin at each end See Fig 6 6 Slide assembled media frame into air cleaner cabinet Be sure airflow arrow on media frame is in same direction as arrow in cabinet Plastic pleat spacers are always on downstream side of filter media Attach outer cover and tighten thumb ...

Page 4: ...9011 Manufacturer reserves the right to discontinue or change at any time specifications or designs without notice and without incurring obligations Book 1 4 Tab 7a 9a PC 101 Catalog No 533 132 Printed in U S A Form 31MF 2SI Pg 4 12 91 Replaces 31MF 1SI ...

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