Crown Boiler PHNTM399, Installation And Operating Instructions Manual

Page: 17 / 120

17
e. Do not install vent terminal directly above
windows or doors.
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” below
ventilated eves, soffits, and other overhangs. In
no case may the overhang exceed 48”. 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 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.
IV. Venting
A. General Guidelines (continued)
Figure 6B: Direct Vent - Optional Vent and
Combustion Air Sidewall Snorkel Terminations
Figure 6A: Direct Vent - Optional Vent Sidewall
Snorkel Termination
iii.
When installed on the same wall, locate
vent terminal at same height or higher than
combustion air terminal.
iv. When using tee terminals, do not locate vent
terminal directly above air intake as dripping
condensate may freeze on and block intake.
c. Locate bottom of vent and combustion air
terminals at least 12 in. (300 mm) [18 in.
(460 mm) in Canada] above the normal snow line
and at least 12 in. (300 mm) above grade level.
d. Locate vent and combustion air terminals at
least 12 in. (300 mm) from any door, window, or
gravity inlet into the building.
Figure 7: Direct Vent - Vertical Terminations