Install Instructions

Combustion air filter

This unit has a standard air filter located at the combustion air inlet. This filter helps ensure clean air is used for the

combustion process. Check this filter every month and replace when it becomes dirty. The filter size on Models 497 - 747 is

12" x 12" x 1" (30.5cm x 30.5cm x 2.5cm) and 16" x 16" x 1" (40.6cm x 40.6cm x 2.5 cm) on Models 987 - 2067. You can find

these commercially available filters at any home center or HVAC supply store.

Figure 1-3_Combustion air filter_ Models 497 - 747

Figure 1-4_Combustion air filter_ Models 987 - 2067

1 Determine unit location (continued)

CAUTION

During construction the air filter should be checked more frequently to ensure it does not become clogged

with construction dirt and debris.

NOTICE

Sustained operation of an appliance with a clogged burner may result in nuisance operational problems,

bad combustion, and non-warrantable component failures.

Installation & Service Manual