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2 Unitary Products Group
036-21560-002 Rev. A (1204)
Three elbows (two in vent pipe and one in the air intake pipe) are already accounted for and need not be included in the elbow count
from the Table above.
28-1/2
26-1/2
24-5/8
40
A
26-1/2
25-3/8
C
19-1/4
1-1/4
1-1/4
21-5/8
29
21-7/8
11-11/16
18-1/2
7-1/2
29
21-15/16
21-9/16
18-1/2
9-1/8
8-1/2
5/8
5/8
23-5/8
D
2-1/4
23-1/4
20
B
T’STATWIRING
7/8” K.O.
HORIZONTAL
CONDENSATE
DRAIN 2” K.O.
7/8” JUNCTION
BOX HOLE
1-1/2” GAS
PIPE ENTRY
CONDENSATE
DRAIN 7/8” K.O.
T’STATWIRING
7/8” K.O.
HORIZONTAL
CONDENSATE
DRAIN 2” K.O.
7/8” JUNCTION
BOX HOLE
1-1/2” GAS
PIPE ENTRY
CONDENSATE
DRAIN 7/8” K.O.
BOTTOM IMAGE
SUPPLY END
TOP IMAGE
RETURN END
Model Number CFM
Cabinet
Size
Cabinet Dimension
A (in.) B (in.) C (in.) D (in.)
GY9S040A12DH11 1200 A 14-1/2 13-1/4 12 1-3/4
GY9S060B12DH11 1200 B 17-1/2 16-1/4 15 1-3/4
GY9S080B12DH11 1200 B 17-1/2 16-1/4 15 1-3/4
GY9S080C16DH11 1600 C 21 19-3/4 18-1/2 2-1/8
GY9S100C16DH11 1600 C 21 19-3/4 18-1/2 2-1/8
GY9S100C20DH11 2000 C 21 19-3/4 18-1/2 2-1/8
GY9S120D20DH11 2000 D 24-1/2 23-1/4 22 2-1/2
COMBUSTION AIR SUPPLY AND VENT PIPING
MAXIMUM ELBOWS AND VENT LENGTHS
Models Input
BTUH
Pipe Size
Inches
Maximum Number of Elbows*
Minimum
Length
1 2 3 4 5 6 7 8
40,000 1-1/2 25 20 15 10 N/A N/A N/A N/A 5
40,000 2 60555045403020N/A 5
40,000 3 8580757065605040 20
60,000 1-1/2 15 10 N/A N/A N/A N/A N/A N/A 5
60,000 2 6055504540352515 5
60,000 3 8580757065605040 20
80,000/1200 2 60 55 50 45 40 35 25 15 5
80,000/1200 3 85 80 75 70 65 60 50 40 20
80,000/1600 2 60 55 50 45 40 35 25 15 5
80,000/1600 3 85 80 75 70 65 60 50 40 20
100,000 2 25 20 15 10 N/A N/A N/A N/A 5
100,000 3 80 75 70 65 60 55 45 35 5
120,000 3 55 50 45 40 35 25 15 N/A 5