30
-
E
DGES
OF
SHEET
METAL
HOLES
MAY
BE
SHARP
. U
SE
GLOVES
AS
A
PRECAUTION
WHEN
REMOVING
SHEET
METAL
FROM
RETURN
AIR
OPENINGS
.
-
-
-
Upflow Models Minimum Recommended Filter Size
*M9C960303AN 1 - 16 X 25 Side or 1 - 14 X 24 Bottom Return
*M9C960403AN 1 - 16 X 25 Side or 1 - 14 X 24 Bottom Return
*M9C960603AN 1 - 16 X 25 Side or 14 X 24 Bottom Return
*M9C960603BN 1 - 16 X 25 Side or Bottom Return
*M9C960803BN 1 - 16 X 25 Side or Bottom Return
*M9C960804CN 1 - 16 X 25 Side or Bottom Return
*M9C961004CN 2 - 16 X 25 Side or 1 - 20 X 25 Bottom Return
*M9C961005CN 2 - 16 X 25 Side or 1 - 20 X 25 Bottom Return
*M9C961205DN 2 - 16 X 25 Side or 1 - 24 X 24 Bottom Return
*C9C960403BN 2 - 10 X 20 or 1 - 14 X 25 Top Return
*C9C960603BN 2 - 10 X 20 or 1 - 14 X 25 Top Return
*C9C960803BN 2 - 14 X 20 or 1 - 16 X 25 Top Return
*C9C961005CN 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
A combination of one side & bottom may be used instead of both sides
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