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Venting
5. Any run of single wall vent pipe passing through an
unheated space must be insulated with an insulation
suitable to 550°F (288°C).
6. The vent system must be installed to prevent collection
of condensate. Pitch horizontal pipes downward 1/4-
inch per ft. (21mm/m) toward the vent cap to facilitate
drainage. Vertical vent pipes should be piped as
depicted in
Figure
14,
7. The equivalent length of the vent system must not be
less than 5-ft. (1.5m) and must not exceed 50-ft.
(15.2m). Equivalent length equals the total length of
straight pipe plus 10' (3.05m) for each 90° elbow and 4-
ft. (1.22m) for each 45° elbow.
8. Each slip joint must be secured with at least three
corrosion resistant screws. Two full turns of 3m #425
Aluminum Foil tape or its equivalent must then be
used to seal each joint. General Electric RTV-108, Dow-
Corning RTV-732 or an equivalent may be used instead
of the tape.
9. For horizontal vent systems longer than 5-ft. (1.5m),
the system must be supported from over-head
building structures at 3-ft. (1m) intervals.
10. The exhaust vent system must remain at a minimum
distance of 6-inch (152mm) from all combustible
materials. Any part of the vent system that passes
through a combustible material must be properly
insulated.
NOTICE
Increasing the clearance distances may be necessary if
there is a possibility of distortion or discoloration of
adjacent materials.
For a VERTICAL vent pipe section that passes through a
floor or roof, an opening 4-inch (102mm) greater in
diameter is required (see
insulated and flashed in accordance with applicable
installation codes. See
Figure
A HORIZONTAL section of an exhaust vent system that
passes through a combustible wall must be constructed
and insulated as shown in
26
Figure
15.
Table
1). The opening must be
15.
Figure
16,
Figure
17.
Figure 14. Vertical intake/Vent installation
* 2 FT. Min plus max snow depth for area.
** If excessive condensation develops, a drip leg with a
condensate drain may be required. Insulating the pipes may
eliminate the problem.
CAT-2764C
GKNE-SVX001B-EN
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