23
Table 6 – Filter Media Pressure Drop (Clean) Versus Face Velocity-- In. W.C. (Pa)
Face Velocity
Factory- Accessory
Washable
Representative After-Market Filter Media*
Fiberglass* Pleated*
FPM (m/s) (1-in. / 2.5 cm) (1-in. / 2.5 cm) (2-in. / 5 cm) (1-in. / 2.5 cm) (2-in. / 5 cm)
200 (1) 0.04 (10) 0.05 (13) 0.08 (20) 0.18 (47) 0.12 (31)
300 (1.5) 0.05 (14) 0.09 (22) 0.13 (34) 0.30 (75) 0.21 (52)
400 (2) 0.07 (17) 0.13 (32) 0.20 (50) - - 0.31 (78)
500 (2.5) 0.08 (21) 0.18 (44) 0.27 (69) - - - -
600 (3) 0.09 (23) 0.23 - - - - - - -
700 (3.6) 0.10 (26) 0.29 - - - - - - -
Table 7 – Air Filter Selection and Duct Sizing -- In. (mm)
FURNACE C ASING WIDTH
FILTER SIZE
FILTER TYPE
SIDE RETURN BOT TOM RETURN
17---1/2 (445)
16 x 25 x 3/4
(406 x 635 x 19)
16 x 25 x 3/4
(406 x 635 x 19)
Washable*
21 (533)
16 x 25 x 3/4
(406 x 635 x 19)
20 x 25 x 3/4
(508 x 635 x 19)
Washable*
24---1/2 (622)
16 x 25 x 3/4
(406 x 635 x 19)
24 x 25 x 3/4
(610 x 635 x 19)
Washable*
* Recommended to maintain air filter face velocity. See Product Data for part number .
Air Filter Located in Filter Cabinet
FILTER CABINET HEIGHT --- IN (MM) F I LT E R S I Z E --- I N ( M M ) FILTER TYPE
16 (406)
(1) 16 x 25 x 3/4*
(406 x 635 x 19) or
(1) 16 x 25 x 4---5/16
(406 x 635 x 110)
Washable or Media*
20 (508)
(1) 20 x 25 x 3/4*
(508 x 635 x 19) or
(1) 20 x 25 x 4---5/16
(508 x 635 x 110)
Washable or Media*
24 (610)
(1) 24 x 25 x 3/4*or
(610 x 635 x 19) or
(1) 24 x 25 x 4---5/16
(610 x 635 x 110)
Washable or Media*
* Filters with a side return---air may have a different filter size. Measure the filter to obtain the correct size.
* Recommended to maintain air filter face velocity. See Product Data for part number .
987MA
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