28
differing filter arrangements can be applied. Filters can
be installed in the central return register or a side panel
external filter rack kit (upflows). As an alternative a media
air filter or electronic air cleaner can be used as the
requested filter. 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 standard 1” filter and
often has lower static pressure loss than a 1” filter. Also
a deep-pleated filter will typically require less frequent
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
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.
Model
Minimum Recommended Filter Size^
*MVC960403BN*
1 - 16 X 25 Side or Bottom
*MVC960603BN*
1 - 16 X 25 Side or Bottom
*MVC960803BN*
1 - 16 X 25 Side or Bottom
*MVC960804CN*
1 - 16 X 25 Side or Bottom
*MVC961005CN*
1 - 20 X 25 Bottom / 2 - 16 X 25 Side Return
*MVC961005DN* 1 - 20 X 25 Bottom / 2 - 16 X 25 Side Return
*MVC961205DN* 1 - 20 X 25 Bottom / 2 - 16 X 25 Side Return
*CVC960403BN*
2 - 10 X 20 or 1 - 16 X 25 Top Return
*CVC960603BN*
2 - 10 X 20 or 1 - 16 X 25 Top Return
*CVC960804CN*
2 - 10 X 20 or 1 - 16 X 25 Top Return
*CVC961005CN*
2 - 14 X 20 or 1 - 20 X 25 Top Return
*CVC961205DN*
2 - 14 X 20 or 1 - 20 X 25 Top Return
^
Larger filters may be used, filters may also be centrally located
WARNING
Edges of sheet metal holes may be sharp. Use
gloves as a precaution when removing sheet
metal from return air openings.
When the furnace is installed without a cooling coil, it is
recommended that a removable access panel be provided
in the outlet air duct. This opening shall be accessible
when the furnace is installed and shall be of such a size
that the heat exchanger can be viewed for visual light
inspection or such that a sampling probe can be inserted
into the airstream. The access panel must be made to
prevent air leaks when the furnace is in operation.
When the furnace is heating, the temperature of the return
air entering the furnace must be between 55°F and 100°F.
Filters - Read This Section Before Installing The
Return Air Duct
CUT USING TIN SNIPS
SCRIBE LINES OUTLINING
DUCT FLANGES
Dual Flange Cut Outs
Figure 38
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. Damage or repairs due to
the installation of the furnace without filters is not covered
under the warranty.
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.
Horizontal Installations
Filters must be installed in either the central return register
or in the return air duct work.
Upright Installations
Depending on the installation and/or customer preference,
