13
Installation of the vent and combustion air pip-
ing must comply with local codes and require-
ments and with the National Fuel Gas Code
NFPA 54, ANSI Z223.1 for installations in the U.S.
or CSA B149.1 or B149.2 for installations in
Canada.
For direct vent installations in the
Commonwealth of Massachusetts, the installer
must comply with the additional requirement
outlined on pages 33 and 34.
A gas vent extending through a sidewall should
not terminate near an adjacent wall or below any
building extensions such as roof eaves, balconies
or decks. Failure to comply with the required
clearances could result in severe personal injury,
death or substantial property damage.
WARNING
NOTICE
NOTICE
Direct Vent -Horizontal
The installer has three options when direct venting hori-
zontally, Concentric, Wall Thimble or Two Pipe. The
three vent options are shown in Figs. 9 through 11A
pages 13 through 18. Both the Concentric and Wall
Thimble options are available in accessory kits through
Triangle Tube. See Figs. 10 & 11 for Wall Thimble and
Two Pipe installation details or the MODULATING
DELTA Concentric Vent Installation Manual for addition-
al Concentric details. Both the Concentric and Two Pipe
can snorkel up outside the building a maximum of 36”.
Direct Vent Installation of Vent/Air Piping
Hose
Clamps
Flexible
Air Hose
Combustion
Air Inlet
Appliance
Adapter
Spring
Clip
Flue
Outlet
Condensate
Drain Hose
3" Diameter
Trap Loop
Cable
Ties
To Drain According
to Local Codes
Horizontal Termination
Adapter With AIr
Holes Facing Down
12” Min. Above
Grade or Projected
Snow Line
Termination
Straight or Tee or Hood
with Bird Screen (s)
Thimble -
Seal Around
Thimble & Pipe
With Silcone
24” Max.
000
Direct Vent - Horizontal Concentric
See MODULATING DELTA Concentric Vent Installation Manual for Installation Details
Fig. 9:
