Thermal Solutions APEX APX425C Installation, Operating And Service Instructions page 20

4
Venting
(continued)
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.
(600 mm) below ventilated eves, soffits,
and other overhangs. In no case may the
overhang exceed 48 in. (1,200 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 4-5 for
details.
Figure 4-9: Direct Vent - Vertical Terminations
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.
20
APEX Installation, Operating, & Service Instructions
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 spacing is recommended to avoid
frost damage to building surfaces where
vent terminations are placed.
q. For multiple boiler installations with vertical
roof terminals, maintain minimum 12 in.
(300 mm) horizontal distance between
adjacent boiler vent terminals.
Figure 4-10: Direct Vent - Vertical
Terminations with Sloped Roof
106308-05 - 3/23