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11
with at least one side open, similar to a joist bay
application. Use double wall thimble [Burnham
Part No. 8116115 (3”), 100185-01 (4”)] when
penetrating a combustible wall.
9. Do not install venting system components on
the exterior of the building except as specifi cally
required by these instructions. The vent termination
location is restricted as follows:
a. Minimum twelve (12) inches above grade plus
normally expected snow accumulation level, or
seven (7) feet above grade if located adjacent
to public walkway. Do not install over public
walkway where local experience indicates
appliance fl ue gas vapor or condensate creates a
nuisance or hazard.
b. Minimum three (3) feet above any forced air
inlet located within ten (10) feet.
c. Direct Vent - Minimum one (1) foot below, one
(1) foot horizontally from, or one (1) foot above
any door, window, or gravity air inlet.
Power Vent - Minimum four (4) feet below, four
(4) feet horizontally from, or four (4) feet above
any door, window, or gravity air inlet.
d. Minimum four (4) feet horizontally from electric
meters, gas meters, regulators, and relief valves.
This distance may be reduced if equipment is
protected from damage due to condensation or
vapor by enclosure, overhangs, etc.
e. Minimum twelve (12) inches from overhang or
corner of building.
10. Enclose vent passing through occupied or
unoccupied spaces above the boiler with material
having a fi re resistance rating of at least equal to the
rating of the adjoining fl oor or ceiling. Maintain
minimum clearances to combustible materials. See
Figure 1.
Note: For one or two family dwellings, fi re
resistance rating requirement may not need to be
met, but is recommended.
11. Plan venting system to avoid possible contact with
plumbing or electrical wires. Start at vent connector
on top of boiler and work towards vent terminal.
12. Once a vent pipe manufacturer and system is chosen
never mix and match vent systems.
13. If a non-standard length pipe is required:
Gasketed Vent System: The use of the adjustable
length pipe (P/N 8116319U) is recommended to
complete a non-standard pipe length. This pipe
requires a minimum installed length of 12¾ inch
and can adjust across a 7 inch gap up to a maximum
of 19¾ inch long. (Note for the adjustable pipe
the installed length should be measured from the
centerline of the bead on the male end of the fi rst
pipe to the end of the female pipe excluding the
locking band of the second pipe with a single
gasket.) Only in the event the adjustable length pipe
is not suffi cient a standard length pipe may be cut
using the procedure outlined below for the Gasket-
Less Vent System.
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C. Install Vent Pipe, Burnham Gasketed Vent System.
1. Procedure for Joining Burnham Gasketed Vent Pipe
and Fittings. See Figure 3.
Figure 3: Burnham Gasketed Vent Joint Detail