M3
CONDENSING WATER BOILER
19
34-1115 12/15
7.6 Optional Filter Box for Dusty or Dirty Combustion Air
The field installed optional air inlet filter box must be attached to the combustion air inlet on any appliance located
where it is exposed to dusty, dirty or lint filled combustion air. Replace the filter on a 3 to 6 month schedule, or more
often, based on severity of contamination. Inadequate combustion air or non-combustible particulate matter such as
dust, dirt, dryer lint, concrete dust, dry wall dust or the like can be drawn in with combustion air and block burner
ports. This can cause unreliable operation and non-warrantable failures. When the optional field installed filter box is
required, do not operate the appliance without a suitable filter. See the following illustration for filter and filter box kit
part numbers and installation instructions.
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