Whirlpool WGFD293 Instruction Manual download pdf (Page 32)

Filters—Read This Section Before Installing the Return Air Ductwork

■ Filters must be used with this furnace. Discuss filter

maintenance with the building owner.

■ Filters do not ship with this furnace, but must be provided,

sized and installed externally by the installer.

■ Filters must comply with UL900 or CAN/ULCS111 standards.

If the furnace is installed without filters, the warranty will be

voided.

■ On upflow units, guide dimples locate the side return cutout

locations. Use a straight edge to scribe lines connecting the

dimples. Cut out the opening on these lines.

NOTE: An undersized opening will cause reduced airflow.

Refer to Minimum Filter Requirement charts to determine filter

area requirements.

*Minimum filter area dictated by heating airflow requirement.

Minimum Filter Requirements Chart

Upflow—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

0453_XA 376* 384 480 576 - - -

0704_XA - - 627* 627* 672 768 -

0905_XA - - - 836* 836* 836* 960

1155_XA - - - 940* 940* 940* 960

Counterflow—Cooling Airflow Requirement (CFM)—Permanent Minimum Filter Area (sq. in.) Based On

600 ft (182.9 m) Per Minute Filter Face Velocity

0704_XA - - 320* 320* 336 384 -

0905_XA - - - 427* 427* 427* 480

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

(91.4 m) Per Minute Filter Face Velocity

0453_XA 376* 384 480 576 - - -

0704_XA - - 564* 564* 672 768 -

0905_XA - - - 752* 752* 768 960

1155_XA - - - 940* 940* 940* 960

Counterflow—Cooling Airflow Requirement (CFM)—Permanent Minimum Filter Area (sq. in.) Based On

300 ft (91.4 m) Per Minute Filter Face Velocity

0704_XA - - 641* 641* 672 768 -

0905_XA - - - 854* 854* 854* 960

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Whirlpool WGFD293 Instruction Manual Page 32