Bradford White PDX1-40S6FBN Installation And Operating Instruction Manual page 20

Venting continued-
It is acceptable to install a 90 degree elbow on IPEX concentric vent
terminations use with this power direct vent water heater (see Figure 12b). A
short length of appropriate diameter vent pipe should be used to transition from
the vent terminal to the 90 degree elbow. Approved venting materials along
with primers and cements are listed at the beginning of this venting section.
When the 90 degree elbow is used the equivalent length of the elbow and short
length of vent pipe must be factored into the total vent/air intake pipe
determinations (see Tables 1 and 2 for appropriate vent connector lengths).
(B) DIMENSION
MIN MAX
12" (30.5 CM) 44" (111.8 CM)
Figure 5b
THROUGH THE ROOF VENTING: (VERTICAL VENTING STANDARD
TERMINALS).
Cut the necessary holes through the roof and ceiling and install the vent
connector as shown in Figure 6. Make sure that the installation meets the local
codes and/or The National Fuel Gas Code ANSI Z223.1 (Latest Edition) or
CGA/CAN B149 Installation Code (latest edition).
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