Name: Lennox Merit ML193UH
Brand: Lennox
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Page 23

TABLE 7

Maximum Allowable Exhaust Vent Pipe Length Without Insulation In Unconditioned Space For

Winter Design Temperatures Single − Stage High Efficiency Furnace

Winter Design

Temperatures

°F (°C)

Vent Pipe

Diameter

Unit Input Size

045 070 090 110 135

32 to 21

(0 to −6)

2 in. 26 44 44 24 N/A

2−1/2 in. 18 32 50 58 N/A

3 in. 14 26 38 55 60

20 to 1

(−7 to −17)

2 in 16 28 40 24 N/A

2−1/2 in. 12 20 30 44 N/A

3 in. 9 16 26 32 40

0 to −20

(−18 to −29)

2 in. 10 20 30 24 N/A

2−1/2 in. 8 14 20 32 N/A

3 in. 4 10 16 26 30

Refer to 99% Minimum Design Temperature table provided in the current edition of the ASHRAE Fundamentals Handbook.

NOTE − Maximum unisulated vent lengths listed cannot exceed the maximum allowable intake or exhaust vent length listed in table 5.

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