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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
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
Table 6 – Filter Media Pressure Drop (Clean) Versus Face Velocity- - In. W.C. (Pa)
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
FILTER CABINET HEIGHT --- IN (MM)
14--- 3/16
(360)
{
16 (406)
20 (508)
24 (610)
* Recommended to maintain air filter face velocity. See Product Data for part number.
{ Not all families have these models.
Table 5 – 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)
Washable
(1-in. / 2.5 cm)
(10)
0.05
(14)
0.09
(17)
0.13
(21)
0.18
(23)
0.23
(26)
0.29
Table 7 – Air Filter Selection and Duct Sizing - - In. (mm)
FILTER SIZE --- IN (MM)
14 x 25 x 3/4 (356 x 635 x 19)
(1) 16 x 25 x 3/4* (406 x 635 x 19) or
(1) 16 x 25 x 4--- 5/16 (406 x 635 x 110)
(1) 20 x 25 x 3/4* (508 x 635 x 19) or
(1) 20 x 25 x 4--- 5/16 (508 x 635 x 110)
(1) 24 x 25 x 3/4*or (610 x 635 x 19) or
(1) 24 x 25 x 4--- 5/16 (610 x 635 x 110)
Representative After-Market Filter Media*
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)
Representative After-Market Filter Media*
Fiberglass*
(1-in. / 2.5 cm)
(2-in. / 5 cm)
0.06
(15)
0.09
(22)
0.08
(21)
0.13
(32)
0.11
(28)
0.17
(43)
0.14
(36)
0.22
(56)
0.18
(45)
0.28
(70)
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
(24)
0.08
(21)
0.13
(32)
0.11
(27)
0.16
(41)
0.13
(33)
0.20
(51)
0.16
(40)
0.24
(61)
0.18
(47)
0.29
(73)
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
(18)
0.06
(16)
0.09
(24)
0.08
(20)
0.12
(31)
0.10
(24)
0.15
(38)
0.11
(29)
0.18
(45)
0.13
(34)
0.21
(53)
0.16
(39)
0.24
(61)
0.18
(45)
0.28
(70)
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)
-
-
-
-
-
-
23
Pleated*
(1-in. / 2.5 cm)
(2-in. / 5 cm)
0.24
(60)
0.16
0.34
(85)
0.23
-
-
0.32
-
-
-
Pleated*
(1-in. / 2.5 cm)
(2-in. / 5 cm)
0.20
(51)
0.13
0.29
(72)
0.20
-
-
0.27
-
-
-
-
-
-
-
-
-
-
-
-
-
-
Pleated*
(1-in. / 2.5 cm)
(2-in. / 5 cm)
0.22
(55)
0.15
0.29
(72)
0.20
-
-
0.25
-
-
0.31
-
-
-
-
-
-
-
-
-
-
-
-
-
-
Pleated*
(1-in. / 2.5 cm)
(2-in. / 5 cm)
0.17
(43)
0.11
0.22
(55)
0.15
0.27
(68)
0.18
-
-
0.23
-
-
0.28
-
-
-
-
-
-
-
-
-
Pleated*
(1-in. / 2.5 cm)
(2-in. / 5 cm)
0.18
(47)
0.12
0.30
(75)
0.21
-
-
0.31
-
-
-
-
-
-
-
-
-
FILTER TYPE
Washable or Media*
Washable or Media*
Washable or Media*
Washable or Media*
(40)
(59)
(81)
-
(34)
(49)
(67)
-
-
-
-
(37)
(49)
(63)
(79)
-
-
-
-
(28)
(37)
(47)
(58)
(69)
-
-
-
(31)
(52)
(78)
-
-
-
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