0" clearance for 4" PVC, ABS, or CPVC Schedule
40 piping from combustibel surfaces.
18" minimum in all directions from any obstruction,
such as a wall, that may interfere.
12" minimum from the ground and corners, 9" ceil-
ing overhang, see below Figure.
Combustion Air and Exhaust
Venting Through an Outside Wall - Clerances
The power direct vent outlet terminal shall terminate
at least 36" above any forced air inlet located within
10 feet.
18" minimum from other natural draft(gravity) direct
vent, power vent or power direct vent appliance inlet
and outlet vent.
24" minimum from any appliance inlet and/or outlet
vents when directly below or 45 degree to either side
of center line.
VENTING CONNECTION
The vent system must be gas tight. All seams and joint
must be sealed with silicone sealant or adhesive tape
having a minimum temperature rating of 400 F.
For each elbow added, deduct 5 feet from maximum vent
length. For example, 25 ft. is the maximum total distance
if two elbows are used.
Ÿ
INLET / OUTLET VENT TERMINATION
Install a 4 inch coupling at the outside wall on both the
inlet and exhaust to prevent the terminations from being
pushed inward.
VENTING LENGTH
Diameter
4 inches
Max. No. of Elbow
3 ea
Max. Vertical or Horizontal run in Length 40 ft
.
Power Direct Venting Rule
18
When determining the installation location for a
power direct vent water heater, snow accumulation
and drifting should be considered in areas where
applicable.
WARNING
!
!
2.
1.
3.
When installing the vent system, all applicable national
and local codes must be followed. If thimbles, fire stops
or other protective devices are going to be installed
which will penetrate any combustible or noncombus-
tible construction, be sure to follow all applicable na-
tional and local codes.
Fan assisted appliances : Follow the requirement as
indicated in the latest edition of ANSI Z233.1/NFPA
54.
Horizontal exhaust vent connectors must pitched down-
ward to the chimney at least 1/4" per foot of length.
Single wall vent connectors must be at least 6" from
adjacent unprotected combustible surfaces. Joint of vent
connectors should be securely fastened by sheet metal
screws or other approved method.
The entire vent system must not exceed the size specified
in table.
Pitch down the vent run toward the vent terminal at a
rate of 1/4 inch per foot.
When the horizontal vent run exceeds 5 feet the following
criteria must be observed:
Support the vent run at 3 feet intervals with overhead
hanger.
Ÿ
Install a drain tee assembly and trap in the exhaust
vent as close to the water heater as possible. Con-
nect the trap drain lin to a suibable drain for
downstream.
Ÿ
Ÿ
