Crown Boiler Phantom X series, Installation And Operating Instructions Manual, Page: 21 / 136

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Extend vent/combustion air piping to maintain minimum vertical (‘X’) and minimum horizontal (‘Y’) distance
of 12 in. (300 mm) [18 in. (460 mm) Canada] from roof surface. Allow additional vertical (‘X’) distance for
expected snow accumulation.
Figure 10: Direct Vent - Vertical Terminations
Figure 11: Direct Vent - Vertical Terminations
with Sloped Roof
f. Locate bottom of vent terminal at least 3 ft. (900
mm)above any forced air inlet located within 10
ft. (3.0 m).
g. If window and/or air inlet is within 4 ft. (1.2 m)
of an inside corner, maintain at least 6 ft. (1.8 m)
spacing between terminal and adjoining wall of
inside corner.
h. Locate bottom of vent terminal at least 7 ft.
(2.1 m) above a public walkway.
i. Maintain minimum clearance of at least 4 ft.
(1.2 m) [3 ft. (900 mm)in Canada] horizontally
between vent terminal and gas meters, electric
meters, regulators, and relief equipment. Do
not install vent terminal above or below this
equipment.
j. Do not locate the vent terminal under decks or
similar structures.
k. Top of terminal must be at least 24 in.
(600mm) below ventilated eves, soffits, and
other overhangs. In no case may the overhang
exceed 48 in. (1200 mm). Where permitted
by the authority having jurisdiction and local
experience, the terminal may be located closer
to unventilated soffits. The minimum vertical
separation depends upon the depth of the soffit.
See Figure 6 for details.
l. Maintain minimum 12 in. (300 mm) horizontal
spacing between vent terminal and a building
corner.
m. Under certain conditions, water in the flue gas
may condense, and possibly freeze, on objects
around the terminal including on the structure
itself. If these objects are subject to damage by
flue gas condensate, they should be moved or
protected.
n. If possible, install the vent and combustion air
terminals on a wall away from the prevailing
wind. Reliable operation of this boiler cannot be
guaranteed if terminals are subjected to winds in
excess of 40 mph (64 km/hr).
o. Do not locate combustion air terminal in areas
that might contain combustion air contaminates,
such as near swimming pools.
p. For multiple boiler installations with horizontal
wall terminals, maintain minimum 12 in.
(300 mm) horizontal distance between adjacent
boiler vent terminals. Maintaining greater
IV. Venting
A. General Guidelines (continued)