Table 7 Filter Media Pressure Drop (Clean) Versus Airflow - in. w.c. (Pa)
14x 25 Filter
Representative After-Market Filter Media*
CFM L/s (2-in. / 5 cm)
600 (283) 0,16 (40)
800 (378) 0,23 (59)
1000 (472) 0,32 (81)
1200 (566)
25 Filter
Fiberglass*
(1-in, / 2,5 cm) (2-in, / 5 cm)
0,07 (17) 0,10 (26)
0,10 (25) 0,15 (39)
0,13 (34) 0,21 (52)
0,17 (43) 0,27 (68)
16x
CFM
6OO
8OO
1000
1200
1400
1600
1800
Pleated*
(1-in. / 2.5 cm)
0.24 (60)
0.34 (85)
L/s (1-in. / 2.5 cm) (1-in. / 2.5 cm) (2-in. / 5 cm)
(283) 0,06 (15) 0,20 (51) 0,13 (34)
(378) 0.08 (21) 0.29 (72) 0.20 (49)
(472) 0.11 (28) 0.27 (67)
(566) 0,14 (36)
(661) 0,18 (45)
(755) 0,21 (54)
(850) 0,26 (64)
Representative After-Market Filter Media*
Fiberglass* Pleated*
(2-in, / 5 cm)
0,09 (22)
0,13 (32)
0,17 (43)
0,22 (56)
O.28 (7O)
20 x 25 Filter
(L!s)
(378)
(472)
(566)
(661)
(755)
(850)
(944)
(1038)
Factory-Accy
Washable
(1-in. / 2.5 cm)
0.04 (12)
0,06 (15)
0.07 (18)
0.08 (20)
Factory-Accy
Washable
(1-in, / 2,5 cm)
0,04 (10)
0.05 (13)
0,06 (16)
0.07 (18)
0.08 (21)
0,09 (23)
0.10 (25)
Factory-Accy
Washable
(1-in. / 2.5 cm)
0.04 (11)
0.05 (13)
0.06 (15)
0.07 (17)
0,08 (19)
0.08 (21)
0,09 (23)
0,09 (24)
Factory-Accy
Washable
(1-in, / 2,5 cm)
0,03 (9)
0.04 (11)
0.05 (13)
0.06 (15)
0.06 (16)
0.07 (18)
0.08 (19)
0.08 (21)
Fiberglass*
cm) (2-in. / 5 cm)
Representative After-Market Filter Media*
Pleated*
(1-in. / 2.5 cm)
0,22 (55)
0.29 (72)
CFM (1-in, / 2,5 (2-in, / 5 cm)
800 0,06 (16) 0,09 (24) 0,15 (37)
1000 0,08 (21) 0,13 (32) 0,20 (49)
1200 0,11 (27) 0,16 (41) 0,25 (63)
1400 0,13 (33) 0,20 (51) 0.31 (79)
1600 0,16 (40) 0,24 (61)
1800 0,18 (47) 0,29 (73)
2000 0.21 (54)
2200 0,25 (62)
25 x 25 Filter
L/s
(378)
(472)
(566)
(661)
(755)
(850)
(944)
(1038)
Representative After-Market Filter Media*
Fiberglass* Pleated*
CFM (1-in, / 2,5 cm) (2-in, / 5 cm) (1-in, / 2,5 cm) (2-in, / 5 cm)
800 0,05 (12) 0,07 (18) 0,17 (43) 0,11 (28)
1000 0,06 (16) 0,09 (24) 0,22 (55) 0,15 (37)
1200 0,08 (20) 0,12 (31) 0,27 (68) 0,18 (47)
1400 0,10 (24) 0,15 (38) 0,23 (58)
1600 0,11 (29) 0,18 (45) 0,28 (69)
1800 0,13 (34) 0,21 (53)
2000 0,16 (39) 0,24 (61)
2200 0,18 (45) 0,28 (70)
Representative estimates from filter manufacturer data sheets.
See manufacturers' specifications for pressure drop versus airflow data for specific filter media.
If the filter size that you are looking for is not contained in Table 7, refer to Table 8 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
Table 8 Filter Media Pressure Drop (Clean) Versus Velocity - in. w.c. (Pa)
Face Velocity
FPM (m/s)
200 (1)
300 (1.5)
400 (2)
500 (2,5)
600 (3)
700 (3,6)
Factory-Accy
Washable
(1-in. / 2.5 cm)
0.04 (10)
0.05 (14)
0.07 (17)
0,08 (21)
0,09 (23)
0,10 (26)
Fiberglass*
(1-in. / 2.5 cm)
0.05 (13)
0,09 (22)
0,13 (32)
0,18 (44)
0,23
0,29
Representative After-Market Filter Media*
Pleated*
(2-in, / 5 cm)
0,08 (20)
0,13 (34)
0,20 (5O)
0,27 (69)
(1-in. / 2.5 cm) (2-in. / 5 cm)
0,18 (47) 0,12 (31)
0.30 (75) 0.21 (52)
0.31 (78)
Representative estimates from filter manufacturer data sheets.
See manufacturers' specifications for pressure drop versus airflow data for specific filter media.
440 01 4001 08 Specifications subject to change without notice. 25
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