be installed in the central return register or a side panel
One of the most common causes of a problem in a forced
Upflow Models
Minimum Recommended Filter Size
*0403A* 1 - 16 X 25 Side or 1 - 14 X 24 Bottom Return
*0603A* 1 - 16 X 25 Side or 14 X 24 Bottom Return
*0603B*
1 - 16 X 25 Side or Bottom Return
*0604B* 1 - 16 X 25 Side or Bottom Return
*0803B* 1 - 16 X 25 Side or Bottom Return
*0804B* 1 - 16 X 25 Side or Bottom Return
*0804C* 1 - 16 X 25 Side or Bottom Return
*0805C*
1 - 16 X 25 Side or Bottom Return¹
*1005C* 2 - 16 X 25 Side or 1 - 20 X 25 Bottom Return¹
*1205D* 2 - 16 X 25 Side or 1 - 24 X 24 Bottom Return¹
*0403A* 2 - 10 X 20 or 1 - 14 X 25 Top Return
*0603A* 2 - 10 X 20 or 1 - 14 X 25 Top Return
*0804B* 2 - 14 X 20 or 1 - 16 X 25 Top Return
*0805C* 2 - 14 X 20 or 1 - 20 X 25 Top Return
*1005C* 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
Y
C
Y
C
G
R
W
Y2
Y/Y1
C
G
R
W
ROOM THERMOSTAT
INTEGRATED FURNACE
CONTROL MODULE
REMOTE COOLING UNIT
(SINGLE STAGE)
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