24
Table 7 – Air Filter Selection and Duct Sizing -- In. (mm)
FURNACE CASING WIDTH
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*
20 (508)
(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 (610)
(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.
14-3/16 and 17-1/2-in.
Furnace
16-in. Media Cabinet
21-in. Furnace
4-Ton or less, AC
capacity airflow
20-in. Media Cabinet
4-in.
Block Off
Plate
1/2-in.
Screws
20- or 24-in. Media
Cabinet
Bottom Return Plenum
21- or 24-1/2-in.
Furnace
Up to 5-Ton AC
capacity airflow
45
°
Transition
20- or 24-in. Media Cabinet
Screw
14-3/16-in. Furnace
Filler plates
Screw
14--3/16-in. Furnace with Filler Plates, Centered
14-3/16-in. Furnace
Filler plate
Screws
14--3/16-in. Furnace with Filler Plates, Off--Set to Right
Media Cabinet Installation Option for
4-Ton or Less A/C Capacity
20- or -24-in. Media Cabinet Installation
with Angled Transition
20- or -24-in. Media Cabinet Installation
for Combination Side and Bottom Return
Media Cabinet Installation
Side Return
21-in. Furnace
up to 5-Ton AC
Capacity
24-1/2-in. Furnace
up to 4-Ton AC
Capacity
A11437
Fig. 29 -- Media Filter
