GC9C96 Installation Manual
31
EDGES OF SHEET METAL HOLES MAY BE SHARP. USE GLOVES AS A PRECAU-
TION WHEN REMOVING SHEET METAL FROM RETURN AIR OPENINGS.
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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
Downflow Models
*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