MrCool Signature Series - Exhaust Pipe Connections

507276-05C Page 21 of 57mrcool.com
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
045 070 090 110 135 045 070 090 110 135 045 070 090 110 135 045 070 090 110 135
1 25 20
66 51 29 9 95 95 73 38 113 112 93 93 89
2 20 15 61
90 90 68 33 108 107 88 88
3 15 10 56 19 85 85 63 28 103 102 83 83 79
10 51 36 80 80 58 23 98 97 78 78
5 31 9 85 75 53 18 93 92 73 73 69
6
26 70 70 13 88 87 68 68
7 36 21 65 65 8 83 82 63 63 59
8 31 16 60 60 38 3 78 77 58 58
9 26 11 55 55 33 73 72 53 53
10 21 6 50 50 28 68 67
Number
of 90°
Elbows
Used
Capacity Capacity Capacity Capacity
045 070 090 110 135 045 070 090 110 135 045 070 090 110 135 045 070 090 110 135
1 25 20
66 51 29 95 95 73 38 113 112 93 93 89
2 20 15 61
90 90 68 33 108 107 88 88
3 15 10 56 19 85 85 63 28 103 102 83 83 79
10 51 36 80 80 58 23 98 97 78 78
5 31 9 85 85 53 18 93 92 73 73 69
6
26 70 70 13 88 87 68 68
7 36 21 65 65 8 83 82 63 63 59
8 31 16 60 60 38 3 78 77 58 58
9 26 11 55 55 33 73 72 53 53
10 21 6 50 50 28 68 67
Table 5C.