INSTALLATION OF VENT SYSTEM, SIDEWALL
With the route of the venting system and selection of materials completed, as discussed in the 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 19.
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, see Figure17.
The vent system piping should be supported every 5 feet (1.5 m) of vertical run and every 3 feet (91 cm) 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
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 equivalent feet of pipe as listed in Table 1.
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 (1.5 m) of vertical run and every 3 feet (91 cm) of horizontal run. All piping and fittings must be joined by the proper procedures as described under: VENT PIPE PREPARATION.
FIGURE 20.
IMPORTANT
The vent system must terminate so that proper clearances are maintained as cited in local codes or the current edition of the National Fuel Gas Code (ANSI Z223.1) and as listed below:
1.Vent Termination must extend a minimum of 18 inches (46 cm) above roof or 18 inches (46 cm) above the anticipated snow level to prevent blockage of the vent termination, as shown in Figures 19 and 20.
2.The venting system should terminate at least four (4) feet (1.2 m) from or one (1) foot (30 cm) above any gable, dormer or other roof structure with building interior access; i.e., vent, window, etc.
3.The venting system should terminate three (3) feet (91 cm) above any forced air inlet located within ten feet (3.0 m).
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