Lennox Hearth G43UF EXHAUST PIPE VENTING TABLE , TERMINATION KITS EQUIVALENT VENT LENGTHS

G43UF / Page 7
EXHAUST PIPE VENTING TABLE
1 Maximum Equivalent Vent Length − One or Two Pipe Applications
Altitude Vent Size
(diameter) G43UF−24B−045 G43UF−24B−070
G43UF−36B−070
G43UF−36C−090
G43UF−48C−090
2 G43UF−48C−110
2 G43UF−60C−110 3 G43UF−60D−135
()
ft. mft.mft.mft.mft.m
0 − 2000 ft.
(0 609 )
2 in. 110 34 70 21 50 15 30 9 n/a n/a
(0 − 609 m) 2−1/2 in. 135 41 135 41 100 31 70 21 n/a n/a
3 in. 160 49 160 49 125 38 125 38 4 125 4 38
4 in. 250 76 250 76 225 69 200 61 180 55
2001 − 4500 ft.
(610 1371 )
2 in. 110 34 70 21 50 15 20 6 n/a n/a
(610 − 1371 m) 2−1/2 in. 135 41 135 41 100 31 70 21 n/a n/a
3 in. 160 49 160 49 125 38 125 38 4 90 4 27
4 in. 250 76 250 76 225 69 200 61 180 55
4501 − 7500 ft.
(1372 2286 )
2 in. 110 34 70 21 30 9 n/a n/a n/a n/a
(1372 − 2286 m) 2−1/2 in. 135 41 135 41 100 31 70 21 n/a n/a
3 in. 160 49 160 49 125 38 125 38 4 90 4 27
4 in. 250 76 250 76 225 69 200 61 180 55
7501 − 10,000 ft.
(2287 3048 )
2 in. 110 34 70 21 n/a n/a n/a n/a n/a n/a
,
(2287 − 3048 m) 2−1/2 in. 135 41 135 41 100 31 70 21 n/a n/a
3 in. 160 49 160 49 125 38 125 38 4 90 4 27
4 in. 250 76 250 76 225 69 200 61 180 55
NOTE − Minimum Equivalent Vent Pipe length is 15 feet (4.6 m).
1 Maximum Equivalent Vent Length" permitted is defined as Total Length (linear feet) of vent pipe, plus equivalent length (ft.) of fittings, plus equivalent length (ft.) of termination".
2 110 models must have the supplied 90° street ell installed directly into the unit flue collar. The street ell must be included in the elbow count.
3 135 models must have 3 in. to 2 in. reducing elbow (supplied) installed directly into the flue collar. Reducing ell must be included in elbow count.
4 90 elbows must be limited to 3 in. sweep type elbows.
VENTING NOTES  One 90elbow is equivalent to 5 feet (1.5 m) of straight vent pipe.
Two 45 elbows are equal to one 90 elbow.
One 45 elbow is equivalent to 2.5 feet (.75 m) of straight vent pipe.
Wall and roof termination (non−concentric) exhaust pipe must terminate with reducer to improve exhaust velocity away from intake piping.
045 and 070 − 2, 2−1/2, 3 or 4 in. − terminate with 1−1/2 in. pipe
090 − 2, 2−1/2, 3 or 4 in. − terminate with 2 in. pipe
110 − 2, 2−1/2, 3 or 4 in. − terminate with 2 in. pipe
135 − 3 or 4 in. − terminate with 2 in. pipe
TERMINATION KITS − EQUIVALENT VENT LENGTHS
Vent Pipe Equivalent Length − ft. (m)
Heat
Vent Pipe
Diameter
Concentric
Kits
Close Couple
Kits
Wall Ring
Kit
Outdoor Exhaust
Accelerator
(Diameter X Length)
Heat
Size 1−1/2 in.
(38 mm)
2 in.
(51 mm)
3 in.
(76 mm)
2 in.
(51 mm)
3 in.
(76 mm)
2 in.
(51 mm)
1−1/2 x 12 in.
(38 x 305 mm)
2 x 12 in.
(51 x 305 mm)
in. mm 71M80 69M29 60L46 22G44
30G28 (WTK)
44J40
81J20 (WTK) 15F74 − − − − − −
2 51 12 (3.6) not allowed not allowed 4 (1.2) 1 4 (1.2) 4 (1.2) 4 (1.2) not allowed
045
2−1/2 64 15 (4.6) not allowed not allowed 5 (1.5) 1 5 (1.5) 5 (1.5) 5 (1.5) not allowed
−045 376 21 (6.4) not allowed not allowed 7 (2.1) 1 7 (2.1) 7 (2.1) 7 (2.1) not allowed
4 102 42 (12.8) not allowed not allowed 14 (4.3) 1 14 (4.3) 14 (4.3) 14 (4.3) not allowed
2 51 12 (3.6) not allowed not allowed 4 (1.2) 1 4 (1.2) 4 (1.2) 4 (1.2) not allowed
070
2−1/2 64 15 (4.6) not allowed not allowed 5 (1.5) 1 5 (1.5) 5 (1.5) 5 (1.5) not allowed
−070 376 24 (7.3) not allowed not allowed 8 (2.4) 1 8 (2.4) 8 (2.4) 8 (2.4) not allowed
4 102 42 (12.8) not allowed not allowed 14 (4.3) 1 14 (4.3) 14 (4.3) 14 (4.3) not allowed
2 51 not allowed 3 (1) 3 (1) not allowed 1 (0.3) 2 1 (0.3) not allowed 1 (0.3)
090
2−1/2 64 not allowed 6 (1.8) 6 (1.8) not allowed 2 (0.6) 2 2 (0.6) not allowed 2 (0.6)
−090 376 not allowed 6 (1.8) 6 (1.8) not allowed 2 (0.6) 2 2 (0.6) not allowed 2 (0.6)
4 102 not allowed 12 (3.7) 12 (3.7) not allowed 4 (1.2) 2 4 (1.2) not allowed 4 (1.2)
2 51 not allowed 3 (1) 3 (1) not allowed 1 (0.3) 2 1 (0.3) not allowed 1 (0.3)
110
2−1/2 64 not allowed 6 (1.8) 6 (1.8) not allowed 2 (0.6) 3 2 (0.6) not allowed 2 (0.6)
−110 376 not allowed 6 (1.8) 6 (1.8) not allowed 2 (0.6) 3 2 (0.6) not allowed 2 (0.6)
4 102 not allowed 12 (3.7) 12 (3.7) not allowed 4 (1.2) 3 4 (1.2) not allowed 4 (1.2)
135
3 76 not allowed not allowed 15 (4.6) not allowed 6 (1.8) 3 6 (1.8) not allowed 6 (1.8)
−135 4 102 not allowed not allowed 25 (7.6) not allowed 10 (3.0) 3 10 (3.0) not allowed 10 (3.0)
1Requires field provided 1−1/2 in. (38 mm) outdoor exhaust accelerator.
2Requires field provided 2 in. (51 mm) outdoor exhaust accelerator.
3For use only in non−direct vent applications, when snow riser is not required. Requires field provided 2 in. (51 mm) outdoor exhaust accelerator.