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Venting
A.
Clearance above grade, veranda, porch, deck, or balcony 12in [30cm] min.
B.
Clearance to window or door that may be opened. 12in [30cm] min. for appliances 100,000BTUh [30kW] and lower, in Canada.
[2]
9in
[23cm] for appliances 50,000 BTUh and lower, in USA.
C. Clearance to permanently closed window min. 12in [30cm] recommended to prevent condensation on window, in Canada. 9in
[23cm] for appliances 50,000 BTUh and lower, in USA.
D. Vertical clearance to ventilated soffit located above the termination within a horizontal distance of 2ft [60cm] from the center line of
the termination. 4436MQRB / 5143MQRB-18in [46cm] min, 6961MQRB- 24in [61cm] min.
E.
Clearance to unventilated soffit 4436MQRB / 5143MQRB-12in [30cm] min, 6961MQRB-24in [61cm] min.
F.
Clearance under veranda, porch, deck or balcony 12in [30cm] min.
G. Clearance from a perpendicular inside wall or outer corner to the edge of the vent terminal plate is 3in [7.6cm] min.
H. Clearance to each side of center line extended above meter/regulator assembly 3ft [91cm] within a height 15ft [4.5m] above the
meter/regulator assembly.
I.
Clearance to service regulator vent outlet 3ft [91cm] min.
J.
Clearance to non-mechanical air supply inlet to building or the combustion air inlet to any other appliance: In Canada, 6in [15cm]
for appliances ≤10,000 BTUh [3kW], 12in
[91cm] for appliances >100,000 BTUh [30kW]. In the USA, 6in
appliances >10,000 BTUh [3kW] and ≤50,000 BTUh [15kW], 12in [30cm] for appliances >50,000 BTUh [15kW].
K.
Clearance to a mechanical air supply inlet 6ft [1.8m] min.
L.
Clearance above paved sidewalk or a paved driveway located on public property 7ft [2.1m] min.
M. Clearance above highest point of exit on roof 18in [45cm].
N. Clearance to perpendicular wall 24in [60cm].
1
In accordance with the current CSA B149.1, Natural Gas and Propane Code.
2
In accordance with the current ANSI Z223.1/NFPA 54, National Fuel Gas Code.
3
Permitted only if veranda, porch, deck, or balcony is fully open on a minimum of two sides beneath the floor.
4
Clearance in accordance with local installation codes and the requirements of the gas supplier.
5
A vent shall not terminate directly above a sidewalk or paved driveway that is located between two single family dwellings and serves both dwellings.
Notes:
1) Clearances are to the edge of the terminal plate. Add 6-3/4" for
MQRB4436 & MQRB5143, and 8-1/8" for MQRB6961 to arrive
at centerline.
2)Local codes or regulations may require different clearances.
[3]
[1]
[4]
(US
)
[
]
[30cm] minimum for appliances >10,000 BTUh [3kW] and ≤100,000 BTUh [30kW], 36in
1
[2]
[15cm] for appliances ≤10,000 BTUh [3kW], 9in [23cm] for
[1]
in Canada. In USA, 3ft [91cm] above if within 10ft
(Recommended to prevent re-circulation of exhaust products. For additional requirements check local codes.)
WARNING: WHEN THE
HORIZONTAL VENT TERMINATION
IS ACCESSIBLE A CERTIFIED
GUARD (SAFETY CAGE) SHALL BE
[1,2]
[4]
[4]
(US
),24in for 6961MQRB if combustible.
[5]
INSTALLED.
[2]
[2]
[3m] horizontally.
78
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