D DedicatedDownflow N NaturalGas
H HighAirflow X LowNOx
K DedicatedUpflow
M Upflow/Horizontal
A14”
B17½”
V TwoStage/Variablespeed C21”
H TwoStage/Mul.speed D24½”
S SingleStage/Mul.speed
E TwoStage/HighEfficiency
31200
41600
C ComfortNet™Communica.ngSystem 52000
M Modula.ngFurnace
045:45,000
060:60,000
96 96% 9