Delta Performance PG-25 Installation And Maintenance Manual page 37

Venting and Combustion Air Installation
- No closer than 5 feet below roof over-
hangs
- At least 7 feet above any public walk-
ways
- At least 3 feet above any forced air
intake (does not include the combustion
air inlet) within 10 feet.
- The vent termination must be at least 4
feet from any electric meters, gas
meter-regulators, relief valves or other
equipment. Never terminate the vent
above or below any of these items with-
in 4 feet.
- Vent must terminate at least 12 inches
above grade or common snow line.
NOTICE
In those applications in which the vent
termination is below the projected snow
line the installer has 2 options. In the
first option, the vent system can be rout-
ed vertically through an insulated chase
or "riser box" and then terminated hori-
zontally. The chase is to be constructed
and insulated by the contractor, main-
Fig.17: Termination of Vent system
taining clearances for vertical and hori-
zontal enclosures. In the second option
the installer can use the horizontal con-
centric snorkel kit see Fig. 22B page 36.
If the venting application is a horizontal
direct vent:
- Must maintain 12-inch clearances
below and horizontally from doors and
windows. See dimension A Fig. 17.
If the venting application is a horizontal
non-direct vent:
- Must maintain 4 feet of clearance
below and horizontally from doors and
windows. See dimension A Fig. 17.
If the venting application is a vertical direct
or non-direct vent application:
- The vent must terminate at least 3 feet
above the roof and at least 2 feet higher
than any portion of the building within
10 feet.
Direct Vent - 12 inches
Non-Direct Vent - 4 feet
30
Dimension A