22
Table 5 – Filter Media Pressure Drop (Clean) Versus Airflow -- In. W.C. (Pa)
14 x 25 Filter
(356 x 635 mm)
Factory- Accessory
Washable
Factory- Accessory
Media*
Representative After-Market Filter Media*
Fiberglass* Pleated*
CFM L/s (1-in. / 2.5 cm) (4-in. / 10 cm) (1-in. / 2.5 cm) (2-in. / 5 cm) (1-in. / 2.5 cm) (2-in. / 5 cm)
600 (283) 0.04 (12) 0.05 (12) 0.07 (17) 0.10 (26) 0.24 (60) 0.16 (40)
800 (378) 0.06 (15) 0.07 (19) 0.10 (25) 0.15 (39) 0.34 (85) 0.23 (59)
1000 (472) 0.07 (18) 0.10 (27) 0.13 (34) 0.21 (52) - - 0.32 (81)
1200 (566) 0.08 (20) 0.14 (36) 0.17 (43) 0.27 (68) - - - -
16 x 25 Filter
(406 x 635 mm)
Factory- Accessory
Washable
Factory- Accessory
Media*
Representative After-Market Filter Media*
Fiberglass* Pleated*
CFM L/s (1-in. / 2.5 cm) (4-in. / 10 cm) (1-in. / 2.5 cm) (2-in. / 5 cm) (1-in. / 2.5 cm) (2-in. / 5 cm)
600 (283) 0.04 (10) 0.05 (13) 0.06 (15) 0.09 (22) 0.20 (51) 0.13 (34)
800 (378) 0.05 (13) 0.07 (18) 0.08 (21) 0.13 (32) 0.29 (72) 0.20 (49)
1000 (472) 0.06 (16) 0.11 (28) 0.11 (28) 0.17 (43) - - 0.27 (67)
1200 (566) 0.07 (18) 0.15 (37) 0.14 (36) 0.22 (56) - - - -
1400 (661) 0.08 (21) 0.19 (48) 0.18 (45) 0.28 (70) - - - -
1600 (755) 0.09 (23) 0.24 (60) 0.21 (54) - - - - - -
1800 (850) 0.10 (25) - - 0.26 (64) - - - - - -
20 x 25 Filter
(508 x 635 mm)
Factory- Accessory
Washable
Factory- Accessory
Media*
Representative After-Market Filter Media*
Fiberglass* Pleated*
CFM (L/s) (1-in. / 2.5 cm) (4-in. / 10 cm) (1-in. / 2.5 cm) (2-in. / 5 cm) (1-in. / 2.5 cm) (2-in. / 5 cm)
800 (378) 0.04 (11) 0.05 (12) 0.06 (16) 0.09 (24) 0.22 (55) 0.15 (37)
1000 (472) 0.05 (13) 0.07 (18) 0.08 (21) 0.13 (32) 0.29 (72) 0.20 (49)
1200 (566) 0.06 (15) 0.09 (22) 0.11 (27) 0.16 (41) - - 0.25 (63)
1400 (661) 0.07 (17) 0.12 (31) 0.13 (33) 0.20 (51) - - 0.31 (79)
1600 (755) 0.08 (19) 0.15 (38) 0.16 (40) 0.24 (61) - - - -
1800 (850) 0.08 (21) 0.18 (47) 0.18 (47) 0.29 (73) - - - -
2000 (944) 0.09 (23) 0.22 (56) 0.21 (54) - - - - - -
2200 (1038) 0.09 (24) 0.26 (66) 0.25 (62) - - - - - -
25 x 25 Filter
(635 x 635 mm)
Factory- Accessory
Washable
Factory- Accessory
Media*
Representative After-Market Filter Media*
Fiberglass* Pleated*
CFM L/s (1-in. / 2.5 cm) (4-in. / 10 cm) (1-in. / 2.5 cm) (2-in. / 5 cm) (1-in. / 2.5 cm) (2-in. / 5 cm)
800 (378) 0.03 (9) 0.03 (8) 0.05 (12) 0.07 (18) 0.17 (43) 0.11 (28)
1000 (472) 0.04 (11) 0.05 (12) 0.06 (16) 0.09 (24) 0.22 (55) 0.15 (37)
1200 (566) 0.05 (13) 0.07 (17) 0.08 (20) 0.12 (31) 0.27 (68) 0.18 (47)
1400 (661) 0.06 (15) 0.09 (23) 0.10 (24) 0.15 (38) - - 0.23 (58)
1600 (755) 0.06 (16) 0.12 (31) 0.11 (29) 0.18 (45) - - 0.28 (69)
1800 (850) 0.07 (18) 0.14 (35) 0.13 (34) 0.21 (53) - - - -
2000 (944) 0.08 (19) 0.16 (41) 0.16 (39) 0.24 (61) - - - -
2200 (1038) 0.08 (21) 0.19 (49) 0.18 (45) 0.28 (70) - - - -
If the filter size that you are looking for is not contained in Table 5, refer to Table 6 for a comparison of Pressure Drop (initial/clean resistance
to airflow) versus Face Velocity for a variety of filter media types.
The following equations relate Face Velocity (FPM), Filter Area and Airflow (CFM):
Filter Face Velocity = Airflow / Filter Area
Minimum Filter Area = Rated System Airflow / Maximum Filter Face Velocity
987MA
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