Majestic • MER36MN, MER42MN Installation Manual • 2599-980 Rev. B • 5/23
28
Figure 4.5 Minimum Clearances for Termination
Electrical
Service
V
K
V
K
V
L
C
V
X
= AIR SUPPLY INLET
V
= VENT TERMINAL
= AREA WHERE TERMINAL IS NOT PERMITTED
U.S.A.
CANADA
A Clearance above grade,veranda, porch, deck, balcony or roof.
12 in. (305 mm)
12 in. (305 mm)
B Clearance to window or door that may be opened, or to permanently closed window
9 in. min.
(229 mm min.)
12 in. min.
(305 mm min.)
C
clearance below unventilated soffit
With TRAP-VSS: 14 in. (356 mm)
18 in. (457 mm)
18 in. (457 mm)
clearance below ventilated soffit
With TRAP-VSS: 14 in. (356 mm)
18 in. (457 mm)
18 in. (457 mm)
clearance below any vinyl soffits and electrical service
With TRAP-VSS: 26 in. (660 mm)
30 in. (762 mm)
30 in. (762 mm)
D
clearance to outside corner
6 in. (152 mm)
6 in. (152 mm)
E clearance to inside corner
6 in. (152 mm)
6 in. (152 mm)
F clearance to each side of center line extended above gas meter/regulator assembly
Clearance in accor
-
dance with local in
-
stallation codes and
the requirements of
the gas supplier.
3 ft (914 mm)
within a height 15
ft (4.5 m) above
the meter/regula
-
tor assembly
G
clearance to gas service regulator vent outlet
3 ft (914 mm)
3 ft (914 mm)
H clearance to non-mechanical air supply inlet to building or the combustion air inlet to any other
appliance termination (mechanical or non-mechanical)
9 in. min.
(229 mm min.)
12 in. min.
(305 mm min.)
I
clearance to a mechanical (powered) air supply inlet
***(All mechanical air intakes within 10 feet of a horizontal termination cap must be a minimum
of 3 feet below termination.)
3 ft (914 mm)***
6 ft (1.8 m)
J
On
public
property: clearance above paved sidewalk or a paved driveway.
7 ft (2.1 m)
7 ft (2.1 m)**
**(A vent shall not terminate directly above a sidewalk or paved driveway which is located between two single family dwellings and
serves both dwellings.)
K
clearance from sides of electrical service
6 in. (152 mm)
6 in. (152 mm)
Location of the vent termination must not interfere with access to the electrical service.
L
clearance above electrical service
12 in. (305 mm)
12 in. (305 mm)
Location of the vent termination must not interfere with access to the electrical service.
M
clearance under veranda, porch, deck, balcony or overhang
*(Permitted only if veranda, porch, deck, or balcony is
fully open on a minimum of two sides beneath the floor.)
With TRAP-VSS: 14 in. (356 mm)
18 in.
(457 mm)
18 in.*
(457 mm)*
vinyl or composite overhang
42 in. (1067 mm)
42 in. (1067 mm)
U.S.A. Installations:
In accordance with the current ANSI Z223.1/NFPA 54, National Fuel Gas Code.
Canadian Installations:
In accordance with the current CSA B149.1, Natural Gas and Propane Installation Code.
C. Vent Terminal Clearances
C
J
B
D
B
F
B
A
E
V
V
V
V
V
V
M
H or i
V
G
X
V
H
A
V
V
H
