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D. General Termination
1. Use only listed vent/combustion air terminals.
2. Follow the termination configurations shown
in Table 14, and see Table 16 for acceptable
termination components.
3. Maintain correct clearance and orientation
between vent and combustion air terminals.
a. The required spacing between vent and
combustion air terminals is to prevent flue
gas recirculation. Recirculation of flue gas
products into the combustion air supply can
cause damage to property or the appliance.
b. When installed on the same wall, locate
vent terminal 4 vent pipe diameters above
the combustion air terminal. The snorkel
configuration can be used when penetrations
are at the same height.
4. Locate bottom of vent and combustion air
terminals at least 12 in. (300 mm) [18 in. (460
mm) in Canada] above the normal snow line
and at least 12 in. (300 mm) above grade level.
5. Do not install vent terminal directly above
windows or doors.
6. Locate bottom of vent terminal at least 3 ft.
(900 mm) above any forced air inlet located
within 10 ft. (3.0 m).
7. If window and/or air inlet is within 4 ft. (1.2 m)
of an inside corner, maintain at least 6 ft. (1.8
m) spacing between terminal and adjoining
wall of inside corner.
8. Locate bottom of vent terminal at least 7 ft.
(2.1 m) above a public walkway.
9. Maintain minimum clearance of at least 4 ft.
(1.2 m) [3 ft. (900 mm)in Canada] horizontally
between vent terminal and gas meters, electric
meters, regulators, and relief equipment. Do
not install vent terminal above or below this
equipment.
10. Do not locate the vent terminal under decks or
similar structures.
Thermal Solutions, 1175 Manheim Pike, Lancaster, PA 17601 Website: www.thermalsolutions.com
Phone: 717-239-7642 Fax: 877-501-5212 Email: sales@thermalsolutions.com
11. Top of terminal must be at least 24 in. (600
mm) below ventilated eaves, soffits, and
other overhangs. In no case may the overhang
exceed 48 in. (1200 mm). Where permitted
by the authority having jurisdiction and local
experience, the terminal may be located closer
to unventilated soffits. The minimum vertical
separation depends upon the depth of the
soffit.
12. For multiple appliance installations with
vertical roof terminals, separate vent pipes
may be piped through a common conduit or
chase so that one roof penetration may be
made. Maintain recommended separations of
terminations after penetration.
13. Maintain minimum 24 in. (610 mm) horizontal
spacing between vent terminal and a building
corner.
14. Under certain conditions, water in the flue gas
may condense, and possibly freeze, on objects
around the terminal including on the structure
itself. If these objects are subject to damage by
flue gas condensate, they should be moved or
protected.
15. If possible, install the vent and combustion air
terminals on a wall away from the prevailing
wind. Reliable operation of this product cannot
be guaranteed if terminals are subjected to
winds in excess of 40 mph (64 km/hr).
16. Do not locate combustion air terminal in
areas that might contain combustion air
contaminates, such as near swimming pools.
NOTICE
NOTICE
Use of cellular core PVC (ASTM F891), cellular core
CPVC, or Radel® (polyphenylsulfone) in non-metallic
venting systems is prohibited.
Covering non-metallic vent pipe and fittings with
thermal insulation is prohibited.
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