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10
INSTALLATION OF VENT SYSTEM, SIDEWALL
With the route of the venting system and selection of materials
completed, as discussed in section of this manual titled
PLANNING THE VENT SYSTEM, the through the wall vent terminal
in place and the first section of piping, up to first elbow, installed
at the blower it is time to complete the installation of the venting
system for the sidewall installation.
FIGURE 8
Before completing the installation of the venting system be sure
to read the sections of this manual discussing the proper method
of cutting and cementing PVC pipe and fittings: VENT PIPE
PREPARATION.
It is recommended that the completion of the venting system
start at the blower assembly and run to the coupling on the
inside wall of the vent terminal, Figure 5.
The vent system piping should be supported every 5 feet of
vertical run and every 3 feet of horizontal run. All piping and
fittings must be joined by the proper procedures as described
under: VENT PIPE PREPARATION.
INSTALLATION OF VERTICAL VENT SYSTEM
This unit is approved for venting through the roof with only the
vent terminal that is included with the unit, see Figure 9. A proper
flashing or "BOOT" should be used to seal the pipe where it
exits the roof. The total vent system should not exceed the thirty
(30) equivalent feet of 3 inch pipe or eighty five (85) equivalent
feet of 4 inch pipe as listed in Table 1.
NOTE: The equivalent feet of pipe listed above are exclusive of
the "45° Elbow" termination with installed screen.
Provide support for all pipe protruding through the roof. All piping
should be properly secured. The vent system piping should be
supported every 5 feet of vertical run and every 3 feet of horizontal
run. All piping and fittings must be joined by the proper
procedures as described under: VENT PIPE PREPARATION.
FIGURE 9
IMPORTANT
The vent system must terminate so that proper clearances are
maintained as cited in local codes or the latest edition of the
National Fuel Gas Code, ANSI Z223.1 and as listed below:
1. Vent Termination must extend a minimum of 12 inches above
roof or 12 inches above the anticipated snow level to prevent
blockage of the vent termination.
2. The venting system shall terminate at least four (4) feet from
or one (1) foot above any gable, dormer or other roof structure
with building interior access; i.e., vent, window, etc.
3. The venting system shall terminate three (3) feet above any
forced air inlet located within ten feet.
VENT PIPE PREPARATION
1. INITIAL PREPARATION
A. Make sure the solvent cement you are planning to use is
designed for the specific application you are attempting.
B. Know the physical and chemical characteristics and limitations
of the PVC and CPVC piping materials that you are about to
use.
C. Know the reputation of your manufacturer and their products.
D. Know your own qualifications or those of your contractor. The
solvent welding technique of joining PVC and CPVC pipe is a
specialized skill just as any other pipe fitting technique.
E. Closely supervise the installation and inspect the finished
job before start-up.
F. Contact the manufacturer, supplier, or competent consulting
agency if you have any questions about the application or
installation of PVC and CPVC pipe.
G. Take the time and effort to do a professional job. Shortcuts
will only cause you problems and delays in start-up. By far,
the majority of failures in PVC and CPVC systems are the
result of shortcuts and/or improper joining techniques.