25Table 5 – Filter Media Pressure Drop (Clean) Versus Airflow -- In. W.C. (Pa)14 x 25 Filter(356 x 635 mm)Factory-AccessoryWashableFactory-AccessoryMedia*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-AccessoryWashableFactory-AccessoryMedia*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-AccessoryWashableFactory-AccessoryMedia*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-AccessoryWashableFactory-AccessoryMedia*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 resistanceto 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 AreaMinimum Filter Area = Rated System Airflow / Maximum Filter Face VelocityTable 6 – Filter Media Pressure Drop (Clean) Versus Face Velocity-- In. W.C. (Pa)Face Velocity Factory-AccessoryWashableRepresentative 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 - - - - - - -59SC2C