Use and Care Manual

507277-03C Page 17 of 53mrcool.com
Figure 22. Typical Exhaust Pipe Connections
TRANSITION
2”
2”
2”
3”
Pipe sizedeterminedin Table7.
2”
2”
or
DO NOT transition from smaller
to larger pipe size in horizontal
runs of exhaust pipe.
TOP VIEW
EXHAUST
INTAKE
* When transitioning up in pipe size, use the shortest length of 2” PVC pipe possible.
NOTE: Exhaust pipe and intake pipe must be the same diameter.
*2”
Maximum Allowable Exhaust Vent Lengths with Furnace Installed in a Closet or Basement Using Ventilated Attic or Crawl
Space for Intake Air in Feet
Number
of 90
Elbows
Used
Capacity Capacity Capacity Capacity
045 070 090 110 045 070 090 110 045 070 090 110 045 070 090 110
1 15 10
n/a n/a
61 46 24
n/a
100 80 43
n/a
127 127 108 108
2 10
n/a
56 41 19 95 75 38 122 122 103 103
3
n/a
51 36 14 90 70 33 117 117 98 98
4 46 31
n/a
85 65 28 112 112 93 93
5 41 26 80 60 23 107 107 88 88
6 36 21 75 55 18 102 102 83 83
7 31 16 70 50 13 97 97 78 78
8 26 11 65 45
n/a
92 92 73 73
9 21
n/a
60 40 87 87 68 68
10 16 55 35 82 82 63 63
NOTE
Table 8.