INSTALLATION INSTRUCTIONS
Gas Furnace: N9MSE
26
440 01 4103 03
Specifications subject to change without notice.
Table 7
Filter Media Pressure Drop (Clean) Versus Airflow - in. w.c. (Pa)
14 x 25 Filter
Factory-Accy
Washable
Representative After-Market Filter Media*
Fiberglass*
Pleated*
CFM
L/s
(1-in. / 2.5 cm)
(1-in. / 2.5 cm)
(2-in. / 5 cm)
(1-in. / 2.5 cm)
(2-in. / 5 cm)
600
(283)
0.04
(12)
0.07
(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. / 2.5 cm)
(2-in. / 5 cm)
(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)
-
-
-
-
-
-
20 x 25 Filter
Factory-Accy
Washable
Representative After-Market Filter Media*
Fiberglass*
Pleated*
CFM
(L/s)
(1-in. / 2.5 cm)
(1-in. / 2.5 cm)
(2-in. / 5 cm)
(1-in. / 2.5 cm)
(2-in. / 5 cm)
800
(378)
0.04
(11)
0.06
(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)
-
-
-
-
-
-
25 x 25 Filter
Factory-Accy
Washable
Representative After-Market Filter Media*
Fiberglass*
Pleated*
CFM
L/s
(1-in. / 2.5 cm)
(1-in. / 2.5 cm)
(2-in. / 5 cm)
(1-in. / 2.5 cm)
(2-in. / 5 cm)
800
(378)
0.03
(9)
0.05
(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 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
FactoryAccy
Washable
Representative AfterMarket Filter Media*
Fiberglass*
Pleated*
FPM
(m/s)
(1in. / 2.5 cm)
(1in. / 2.5 cm)
(2in. / 5 cm)
(1in. / 2.5 cm)
(2in. / 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
*
Representative estimates from filter manufacturer data sheets.
See manufacturers’ specifications for pressure drop versus airflow data for specific filter media.
