24
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
-
-
-
-
-
-
-
Table 7 – Air Filter Selection and Duct Sizing -- In. (mm)
FURNACE CASING WIDTH
IN (MM)
FILTER SIZE
FILTER TYPE
SIDE RETURN
BOTTOM
RETURN
14---3/16
{
(360)
16 x 25 x 3/4
(406 x 635 x 19)
14 x 25 x 3/4
(356 x 635 x 19)
Washable*
17---1/2 (445)
16 x 25 x 3/4
(406 x 635 x 19)
16 x 25 x 3/4
(406 x 635 x 19)
Washable*
21
(533)
16 x 25 x 3/4
(406 x 635 x 19)
20 x 25 x 3/4
(508 x 635 x 19)
Washable*
24---1/2 (622)
16 x 25 x 3/4
(406 x 635 x 19)
24 x 25 x 3/4
(610 x 635 x 19)
Washable*
* Recommended to maintain air filter face velocity. See Product Data for part number.
{
Not all families have these models.
Air Filter Located in Filter Cabinet
FILTER CABINET HEIGHT
IN (MM)
FILTER SIZE --- IN (MM)
FILTER TYPE
14---3/16
{
(360)
14 x 25 x 3/4
(356 x 635 x 19)
Washable
or Media*
16 (406)
(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)
Washable
or Media*
21 (533)
(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)
Washable
or Media*
24 ½ (622)
(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)
Washable
or Media*
* Filters with a side return---air may have a different filter size. Measure the filter to obtain the correct size.
* Recommended to maintain air filter face velocity. See Product Data for part number.
{
Not all families have these models.
