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CirCulAtion Air filterS
Figure 11 Figure 12
Figure 13
Figure 15
One of the most common causes of a problem in a forced
air heating system is a blocked or dirty lter. Circulating air
lters must be inspected monthly for dirt accumulation and
replaced if necessary. Failure to maintain clean lters can
cause premature heat exchanger failure.
A new home may require more frequent replacement until all
construction dust and dirt is removed.
Upflow / Horizontal
Model s
Minimum Recommended Filter Size^
*MVC800603B* 1 - 16 X 25 Side or 1 - 14 X 24 Bottom Return
*MVC800604B* 1 - 16 X 25 Side or 14 X 24 Bottom Return
*MVC800803B* 1 - 16 X 25 Side or Bottom Return
*MVC800804C* 1 - 16 X 25 Side or Bottom Return
*MVC800805C*¹ 1 - 16 X 25 Side or Bottom Return¹
*MVC800805D*¹ 1 - 16 X 25 Side or Bottom Return¹
*MVC801005C* 2 - 16 X 25 Side or 1 - 20 X 25 Bottom Return
Downflow / Horizontal
Model s
*CVC800603B* 2 - 10 X 20 or 1 - 16 X 25 Top Return
*CVC800803B* 2 - 10 X 20 or 1 - 16 X 25 Top Return
*CVC800805C* 2 - 14 X 20 or 1 - 20 X 25 Top Return
*CVC801005C* 2 - 14 X 20 or 1 - 20 X 25 Top Return
¹ = use 2 - 16 X 25 filters and two side returns or 20 X 25
filter on bottom return if furnace is connected
to a cooling unit over 4 tons nominal capacity
^ Larger filters may be used, filters may also be centrally located
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