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CIRCULATION A IR F ILTERS
One of the most common causes of a problem in a forced air
heating system is a blocked or dirty filter. Circulating air filters
must be inspected monthly for dirt accumulation and replaced
if necessary. Failure to maintain clean filters can cause prema-
ture 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^
DM80VC0603B* 1 - 16 X 25 Side or 1 - 14 X 24 Bottom Return
DM80VC0604B* 1 - 16 X 25 Side or 14 X 24 Bottom Return
DM80VC0803B* 1 - 16 X 25 Side or Bottom Return
DM80VC0804C* 1 - 16 X 25 Side or Bottom Return
DM80VC0805C*¹ 1 - 16 X 25 Side or Bottom Return¹
DM80VC0805D*¹ 1 - 16 X 25 Side or Bottom Return¹
DM80VC1005C* 2 - 16 X 25 Side or 1 - 20 X 25 Bottom Return
Downflow / Horizontal
Mode l s
DC80VC0603B* 2 - 10 X 20 or 1 - 16 X 25 Top Return
DC80VC0803B* 2 - 10 X 20 or 1 - 16 X 25 Top Return
DC80VC0805C* 2 - 14 X 20 or 1 - 20 X 25 Top Return
DC80VC1005C* 2 - 14 X 20 or 1 - 20 X 25 Top Return
^ Larger filters may be used, filters may also be centrally located
1 = use 2 - 16 X 25 fi lters and two si de returns or 20 X 25 filter
on bottom return if furnace is connected to a cooling unit
over 4 tons nominal capacity
Consider installing an air cleaner with deep-pleated media filter
at the time of furnace installation. A deep-pleated filter with a
MERV rating of 8 (minimum) will often provide better filtration to
protect equipment and the air distribution system than a stan-
dard 1" filter and often has lower static pressure loss than a 1"
filter. Also a deep-pleated filter will typically require less fre-
quent replacement intervals. Avoid using highly restrictive 1"
filters which produce static pressure loss greater than .25" W.C.
In some installations the minimum filter size required (consult
filter sizing chart ) will not lend itself to a filter installation on the
side of the furnace. The installation of a centrally installed air
cleaner cabinet or a return duct filter installation may offer more
practicality.
Clean Comfort™ brand MERV 11 air cleaners have 5¼” media
filters and are available in the following configurations. Consult
your distributor for information on our complete line of IAQ Clean
Comfort™ products.
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