Installation Manual

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Specifications subject to change without notice.
Table 5 – Filter Media Pressure Drop (Clean) Versus Airflow -- In. W.C. (Pa)
14x25Filter
Factory-Accy
Washable
Representative After-Market Filter Media*
Fiberglass* Pleated*
CFM L/s (1-in. / 2.5 cm) (1-in./2.5cm) (2-in./5cm) (1-in. / 2.5 cm) (2-in. / 5 cm)
600 (283) 0.04 (12) 0.07 (17) 0.10 (26) 0.24 (60) 0.16 (40)
800 (378) 0.06 (15) 0.10 (25) 0.15 (39) 0.34 (85) 0.23 (59)
1000 (472) 0.07 (18) 0.13 (34) 0.21 (52) - - 0.32 (81)
1200 (566) 0.08 (20) 0.17 (43) 0.27 (68) - - - -
16x 25 Filter
Factory-Accy
Washable
Representative After-Market Filter Media*
Fiberglass* Pleated*
CFM L/s (1-in. / 2.5 cm) (1-in./2.5cm) (2-in./5cm) (1-in. / 2.5 cm) (2-in. / 5 cm)
600 (283) 0.04 (10) 0.06 (15) 0.09 (22) 0.20 (51) 0.13 (34)
800 (378) 0.05 (13) 0.08 (21) 0.13 (32) 0.29 (72) 0.20 (49)
1000 (472) 0.06 (16) 0.11 (28) 0.17 (43) - - 0.27 (67)
1200 (566) 0.07 (18) 0.14 (36) 0.22 (56) - - - -
1400 (661) 0.08 (21) 0.18 (45) 0.28 (70) - - - -
1600 (755) 0.09 (23) 0.21 (54) - - - - - -
1800 (850) 0.10 (25) 0.26 (64) - - - - - -
20x25Filter
Factory-Accy
Washable
Representative After-Market Filter Media*
Fiberglass* Pleated*
CFM (L/s) (1-in. / 2.5 cm) (1-in./2.5cm) (2-in./5cm) (1-in. / 2.5 cm) (2-in. / 5 cm)
800 (378) 0.04 (11) 0.06 (16) 0.09 (24) 0.22 (55) 0.15 (37)
1000 (472) 0.05 (13) 0.08 (21) 0.13 (32) 0.29 (72) 0.20 (49)
1200 (566) 0.06 (15) 0.11 (27) 0.16 (41) - - 0.25 (63)
1400 (661) 0.07 (17) 0.13 (33) 0.20 (51) - - 0.31 (79)
1600 (755) 0.08 (19) 0.16 (40) 0.24 (61) - - - -
1800 (850) 0.08 (21) 0.18 (47) 0.29 (73) - - - -
2000 (944) 0.09 (23) 0.21 (54) - - - - - -
2200 (1038) 0.09 (24) 0.25 (62) - - - - - -
25x25Filter
Factory-Accy
Washable
Representative After-Market Filter Media*
Fiberglass* Pleated*
CFM L/s (1-in. / 2.5 cm) (1-in./2.5cm) (2-in./5cm) (1-in. / 2.5 cm) (2-in. / 5 cm)
800 (378) 0.03 (9) 0.05 (12) 0.07 (18) 0.17 (43) 0.11 (28)
1000 (472) 0.04 (11) 0.06 (16) 0.09 (24) 0.22 (55) 0.15 (37)
1200 (566) 0.05 (13) 0.08 (20) 0.12 (31) 0.27 (68) 0.18 (47)
1400 (661) 0.06 (15) 0.10 (24) 0.15 (38) - - 0.23 (58)
1600 (755) 0.06 (16) 0.11 (29) 0.18 (45) - - 0.28 (69)
1800 (850) 0.07 (18) 0.13 (34) 0.21 (53) - - - -
2000 (944) 0.08 (19) 0.16 (39) 0.24 (61) - - - -
2200 (1038) 0.08 (21) 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 5 , refer to 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
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 - - - - - - -
* Represen tative estimates from filter man u f acturer data sheets.
See manufacturers’ specifications for pressu re drop versus airflow data for specific filter media.
See Table 7 for filter size details.