Bradford White TW4-75S-76B-3N - Manual (Page 13)

13
Venting (Part I) continued-
sure the vent pipe terminal elbow fitting is at least 1” (2.5 cm) away from the
edge of the wall.
TABLE 1 - VENT CONNECTOR LENGTHS
FOR 3” (7.6 cm) DIAMETER VENT PIPE
Terminating # of Elbows Maximum straight
Length ft (m)
Minimum
straight
Length
ft (m)
48, 65 gal.
Through the Wall 1 55 (16.8) 2 (.6)
Through the Wall 2 50 (15.2) 2 (.6)
Through the Wall 3 45 (13.7) 2 (.6)
Through the Wall 4 40 (12.2) 2 (.6)
Through the Roof 0 60 (18.3) 7 (2.1)
Through the Roof 1 55 (16.8) 7 (2.1)
Through the Roof 2 50 (15.2) 7 (2.1)
Through the Roof 3 45 (13.7) 7 (2.1)
TABLE 2 -VENT CONNECTOR LENGTHS
FOR 4” (10.2 cm) DIAMETER VENT PIPE
Terminating # of 90 
Elbows (excl.
vent term.)
Maximum straight
Length ft (m)
Min
straight
Length
ft (m)
48, 65 gal.
Through the Wall 1 175 (53.3) 10 (3.1)
Through the Wall 2 170 (51.8) 10 (3.1)
Through the Wall 3 165 (50.3) 10 (3.1)
Through the Wall 4 160 (48.8) 10 (3.1)
Through the Wall 5 155 (47.2) 10 (3.1)
Through the Roof 0 180 (54.9) 15 (4.6)
Through the Roof 1 175 (53.3) 15 (4.6)
Through the Roof 2 170 (51.8) 15 (4.6)
Through the Roof 3 165 (50.3) 15 (4.6)
Through the Roof 4 160 (48.8) 15 (4.6)
NOTE: When using 4” (10.2 cm) vent pipe, use a 4” (10.1 cm) to 3” (7.6
cm) reducer and exit the building wall with 3” (7.6 cm) vent pipe using the