Bradford White U-PDX-75S-55FR-3N - Manual (Page 25)

25
Venting continued-
PART II - Venting Specifications for:
40 Gallon (151.4L)
50 Gallon (189.2L)
TABLE 5 - VENT CONNECTOR LENGTHS
FOR 2” (5.1 cm) DIAMETER VENT PIPE
Terminating
# of Elbows
(excl. vent
term.)
Maximum
straight
Length ft (m)
Minimum
straight
Length
ft (m)
Through the Wall 1 30 (9.1) 2 (.6)
Through the Wall 2 25 (7.6) 2 (.6)
Through the Wall 3 20 (6.1) 2 (.6)
Through the Wall 4 15 (4.6) 2 (.6)
Through the Roof 0 35 (9.1) 7 (2.1)
Through the Roof 1 30 (9.1) 7 (2.1)
Through the Roof 2 25 (7.6) 7 (2.1)
Through the Roof 3 20 (6.1) 7 (2.1)
TABLE 6 -VENT CONNECTOR LENGTHS
FOR 3” (7.6 cm) DIAMETER VENT PIPE
Terminating
# of 90

Elbows
(excl. vent
term.)
Maximum
straight
Length ft (m)
Min straight
Length
ft (m)
Through the Wall 1 80 (24.4) 10 (3.1)
Through the Wall 2 75 (22.9) 10 (3.1)
Through the Wall 3 70 (21.3) 10 (3.1)
Through the Wall 4 65 (19.8) 10 (3.1)
Through the Wall 5 60 (18.3) 10 (3.1)
Through the Roof 0 85 (25.9) 15 (4.6)
Through the Roof 1 80 (24.4) 15 (4.6)
Through the Roof 2 75 (22.9) 15 (4.6)
Through the Roof 3 70 (21.3) 15 (4.6)
Through the Roof 4 65 (19.8) 15 (4.6)
IMPORTANT
The minimum equivalent length for the exhaust portion of the vent is 7
feet. The maximum equivalent vent length for the exhaust is 35 feet for
2” diameter pipe and 85 feet for 3” diameter pipe. The intake portion of
the vent must be equal to or less than the vent length of the exhaust.
The tables below are provided for your quick reference, some
installations may require a greater number of elbows. When
calculating equivalent vent length, one 90º elbow is equivalent to 5 feet.