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14 x 25 Filter
Factory-Accessory
(356 x 635 mm)
Washable
CFM
L/s
(1-in. / 2.5 cm)
600
(283)
0.04
800
(378)
0.06
1000
(472)
0.07
1200
(566)
0.08
16 x 25 Filter
Factory-Accessory
(406 x 635 mm)
Washable
CFM
L/s
(1-in. / 2.5 cm)
600
(283)
0.04
800
(378)
0.05
1000
(472)
0.06
1200
(566)
0.07
1400
(661)
0.08
1600
(755)
0.09
1800
(850)
0.10
20 x 25 Filter
Factory-Accessory
(508 x 635 mm)
Washable
CFM
(L/s)
(1-in. / 2.5 cm)
800
(378)
0.04
1000
(472)
0.05
1200
(566)
0.06
1400
(661)
0.07
1600
(755)
0.08
1800
(850)
0.08
2000
(944)
0.09
2200
(1038)
0.09
25 x 25 Filter
Factory-Accessory
(635 x 635 mm)
Washable
CFM
L/s
(1-in. / 2.5 cm)
800
(378)
0.03
1000
(472)
0.04
1200
(566)
0.05
1400
(661)
0.06
1600
(755)
0.06
1800
(850)
0.07
2000
(944)
0.08
2200
(1038)
0.08
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
Factory-Accessory
Face Velocity
FPM
(m/s)
(1-in. / 2.5 cm)
200
(1)
0.04
300
(1.5)
0.05
400
(2)
0.07
500
(2.5)
0.08
600
(3)
0.09
700
(3.6)
0.10
Table 5 – Filter Information
Filter Media Pressure Drop (Clean) Versus Airflow - - In. W.C. (Pa)
Factory-Accessory
Media*
(4-in. / 10 cm)
(12)
0.05
(12)
(15)
0.07
(19)
(18)
0.10
(27)
(20)
0.14
(36)
Factory-Accessory
Media*
(4-in. / 10 cm)
(10)
0.05
(13)
(13)
0.07
(18)
(16)
0.11
(28)
(18)
0.15
(37)
(21)
0.19
(48)
(23)
0.24
(60)
(25)
-
-
Factory-Accessory
Media*
(4-in. / 10 cm)
(11)
0.05
(12)
(13)
0.07
(18)
(15)
0.09
(22)
(17)
0.12
(31)
(19)
0.15
(38)
(21)
0.18
(47)
(23)
0.22
(56)
(24)
0.26
(66)
Factory-Accessory
Media*
(4-in. / 10 cm)
(9)
0.03
(8)
(11)
0.05
(12)
(13)
0.07
(17)
(15)
0.09
(23)
(16)
0.12
(31)
(18)
0.14
(35)
(19)
0.16
(41)
(21)
0.19
(49)
Filter Media Pressure Drop (Clean) Versus Face Velocity- - In. W.C. (Pa)
Washable
(1-in. / 2.5 cm)
(10)
0.05
(14)
0.09
(17)
0.13
(21)
0.18
(23)
0.23
(26)
0.29
Representative After-Market Filter Media*
Fiberglass*
(1-in. / 2.5 cm)
(2-in. / 5 cm)
0.07
(17)
0.10
0.10
(25)
0.15
0.13
(34)
0.21
0.17
(43)
0.27
Representative After-Market Filter Media*
Fiberglass*
(1-in. / 2.5 cm)
(2-in. / 5 cm)
0.06
(15)
0.09
0.08
(21)
0.13
0.11
(28)
0.17
0.14
(36)
0.22
0.18
(45)
0.28
0.21
(54)
-
0.26
(64)
-
Representative After-Market Filter Media*
Fiberglass*
(1-in. / 2.5 cm)
(2-in. / 5 cm)
0.06
(16)
0.09
0.08
(21)
0.13
0.11
(27)
0.16
0.13
(33)
0.20
0.16
(40)
0.24
0.18
(47)
0.29
0.21
(54)
-
0.25
(62)
-
Representative After-Market Filter Media*
Fiberglass*
(1-in. / 2.5 cm)
(2-in. / 5 cm)
0.05
(12)
0.07
0.06
(16)
0.09
0.08
(20)
0.12
0.10
(24)
0.15
0.11
(29)
0.18
0.13
(34)
0.21
0.16
(39)
0.24
0.18
(45)
0.28
Representative After-Market Filter Media*
Fiberglass*
(2-in. / 5 cm)
(13)
0.08
(20)
(22)
0.13
(34)
(32)
0.20
(50)
(44)
0.27
(69)
-
-
-
-
-
-
24
Pleated*
(1-in. / 2.5 cm)
(2-in. / 5 cm)
(26)
0.24
(60)
0.16
(39)
0.34
(85)
0.23
(52)
-
-
0.32
(68)
-
-
Pleated*
(1-in. / 2.5 cm)
(2-in. / 5 cm)
(22)
0.20
(51)
0.13
(32)
0.29
(72)
0.20
(43)
-
-
0.27
(56)
-
-
(70)
-
-
-
-
-
-
-
-
Pleated*
(1-in. / 2.5 cm)
(2-in. / 5 cm)
(24)
0.22
(55)
0.15
(32)
0.29
(72)
0.20
(41)
-
-
0.25
(51)
-
-
0.31
(61)
-
-
(73)
-
-
-
-
-
-
-
-
Pleated*
(1-in. / 2.5 cm)
(2-in. / 5 cm)
(18)
0.17
(43)
0.11
(24)
0.22
(55)
0.15
(31)
0.27
(68)
0.18
(38)
-
-
0.23
(45)
-
-
0.28
(53)
-
-
(61)
-
-
(70)
-
-
Pleated*
(1-in. / 2.5 cm)
(2-in. / 5 cm)
0.18
(47)
0.12
0.30
(75)
0.21
-
-
0.31
-
-
-
-
-
-
-
-
-
(40)
(59)
(81)
-
-
(34)
(49)
(67)
-
-
-
-
-
-
-
-
(37)
(49)
(63)
(79)
-
-
-
-
-
-
-
-
(28)
(37)
(47)
(58)
(69)
-
-
-
-
-
-
(31)
(52)
(78)
-
-
-
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