Crown Boiler PHNTM080 - Page 22

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FIGURE 7.6: HORIZONTAL CPVC/PVC VENTING, (VENT OPTIONS #1 & 2, TERMINAL OPTION A)
2. Horizontal Vent and Air Intake Terminal Location - Observe the following limitations on the vent terminal location (also see
Figure 7.11). When locating a concentric terminal, observe the limitations outlined below for “vent terminals”.
• Vent terminal must be at least 1 foot from any door, window, or gravity inlet into the building.
• WhenTerminalOptionA(ttings)areused,maintainthecorrectclearanceandorientationbetweentheintakeand
exhaust terminals. The recommended horizontal spacing between inlet and exhaust terminals is 36”, however this
spacing may be reduced to 12” (center-to-center) if necessary. The elevation of the exhaust terminal must be at,
or above, that of the intake terminal. The 12” minimum horizontal spacing must be maintained regardless of the
vertical separation between the intake and exhaust terminals. Both terminals must be located on the same wall.
• The bottom of all terminals must be at least 12” above the normal snow line. In no case should they be less than 12”
above grade level.
• The bottom of the vent terminal must be at least 7 feet above a public walkway.
• Do not install the vent terminal directly over windows or doors.
• The bottom of the vent terminal must be at least 3 feet above any forced air inlet located within 10 feet.
• USA Only: A clearance of at least 4 feet horizontally must be maintained between the vent terminal and gas meters,
electric meters, regulators, and relief equipment. Do not install vent terminal over this equipment. In Canada, refer
to B149.1 Installation Code for clearance to meters, regulators and relief equipment.
• Do not locate the vent terminal under decks or similar structures.
• Topofterminalmustbeatleast60”belowventilatedeves,softsandotheroverhangs.Innocasemaytheoverhang
depth exceed 36”. Where permitted by the authority having jurisdiction and local experience, the terminal may be
located closer to unventilatedsofts.Theminimumverticalseparationdependsuponthedepthofthesoft.See
Figure 7.10c for details.
• Vent terminal must be at least 6 feet from an inside corner.
• Undercertainconditions,waterintheuegasmaycondense,andpossiblyfreeze,onobjectsaroundthevent
terminalincludingonthestructureitself.Iftheseobjectsaresubjecttodamagebyuegascondensate,theyshould
be moved or protected.
• Install the vent and air intake terminals on a wall away from the prevailing wind. Reliable operation of this boiler
cannot be guaranteed if these terminals are subjected to winds in excess of 40 mph.
• Air intake terminal must not terminate in areas that might contain combustion air contaminates, such as near
swimming pools. See WARNING on page 12.