Burnham Revolution Installation, Operating And Service Instructions page 11

5. Horizontal vent pipe must maintain a minimum ¼
inch per foot slope down towards boiler.
6. Use noncombustible ¾ inch pipe strap to support
horizontal runs and maintain vent location and slope
while preventing sags in pipe. Do not restrict
thermal expansion or movement of vent system.
Maximum support spacing is five (5) feet. Do not
penetrate any part of the vent system with fasteners.
7. Vent length restrictions are based on equivalent
length of vent/air pipe (total length of straight pipe
plus equivalent length of fittings). Maximum vent/
air lengths are listed in Table 4. Do not exceed
maximum vent/air intake lengths. Table 3 lists
equivalent lengths for fittings. Do not include vent/
air terminals in equivalent feet calculations.
8. Provide and maintain vent pipe minimum clearances
to combustible materials. Vent pipe minimum
clearance to combustible material is four (4) inches
when vent is installed in a fully enclosed (chase)
application or three (3) inches when vent is installed
with at least one side open, similar to a joist bay
application. Use double wall thimble (Burnham Part
No. 8116115) when penetrating a combustible wall.
Other wall thimble manufactures are American
Metal Products, Hart & Cooley, and Metal Fab.
9. Do not install venting system components on the
exterior of the building except as specifically
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 flue 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 unoccu-
pied spaces above the boiler with material having a
fire resistance rating of at least equal to the rating of
the adjoining floor or ceiling. Maintain minimum
clearances to combustible materials. See Figure 1.
Note: For one or two family dwellings, fire resis-
tance 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 first
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 sufficient a standard length pipe may be cut
using the procedure outlined below for the Gasket-
Less Vent System.
WARNING
Never exceed maximum installed length of 19¾
inches for adjustable length pipe.
Risk of flue gas leakage is possible.
Gasket-Less Vent System: Carefully cut pipe to
length using a hacksaw with minimum 32 teeth per
inch or circular saw with metal abrasive wheel.
Remove male (bead) end only – female (bell) end
accepts next fitting or pipe.
NOTICE
Cut must be square with pipe and filed or
sanded smooth before joining. Carefully ensure
roundness of cut pipe by hand with gloves before
installing. Seal joint with RTV specified in this
manual.
14. Seal all Burnham Gasket-Less vent, Burnham mixed
vent (Gasket-Less and Gasketed) and field cut joints
using Dow Corning Silastic 732 RTV, Dow Corning
Silastic 736 RTV, GE RTV106, Polybac #500 RTV,
Sil-bond RTV 4500 (Acetoxy) and Sil-bond RTV
6500. Do not use other adhesives or sealants.
11