Instruction manual

Refer to Minimum Filter Requirement charts to determine filter area requirements.

*Minimum filter area dictated by heating airflow requirement.

Upright Installations

Depending on the installation and/or customer preference, filters

can be installed in the central return register or a side panel

external filter rack kit (upflows). As an alternative, a media air filter

or electronic air cleaner can be used as the requested filter.

The following illustrations show possible filter locations.

Filter Locations—Possible Upright Upflow

Filter Locations—Possible Upright Counterflow

Horizontal Installations

Filters must be installed in either the central return register or in

the return air ductwork.

Minimum Filter Requirements Chart

Cooling Airflow Requirement (CFM)—Permanent Minimum Filter Area (sq. in.) Based On 600 ft (182.9 m)

Per Minute Filter Face Velocity

Input Airflow 600 800 1,000 1,200 1,400 1,600 2,000

0453BXA 194* 194 240 288 - - -

0703BXA - 324* 324* 324* 336 - -

0704CXA - - 291* 291* 336 384 -

0904CXA - - 432* 432* 432* 432* -

0905DXA - - - 388* 388* 388* 480

1155DXA - - - 486* 486* 486* 486*

Cooling Airflow Requirement (CFM)—Permanent Minimum Filter Area (sq. in.) Based On 300 ft (91.4 m) Per

Minute Filter Face Velocity

0453BXA 388* 388* 480 576 - - -

0703BXA - 647* 647* 647* 672 - -

0704CXA - - 583* 583* 672 768 -

0904CXA - - 863* 863* 863* 863* -

0905DXA - - - 777* 777* 777* 960

1155DXA - - - 971* 971* 971* 971*

A. Central return grille

B. Filter

C. Airflow

D. Side return external filter rack kit (either side)

A. Filter access door

B. Filter

C. Central return grille

D. Airflow

E. Filter support bracket (provided)

F. R e t u r n d uc t