Enviro 50-927, C-10791 owner manual Vent Termination Restrictions

Initial Installation

QUALIFIED INSTALLERS ONLY

VENT TERMINATION RESTRICTIONS:
									N
									O
D	E						H
		B
	C
L	B	Fixed			B				G
	F	Closed	Openable		Fixed			G
		Openable			Closed
								M
	B		A		J				K
								I	A
	Termination Cap			Air Supply Inlet
						G	Gas Meter	Restriction Zone
								(Termination not allowed)

Figure 19. Vent Termination Restrictions, refer to Table 2.

Table 2: Vent termination clearances, refer to Figure 19.

Letter	Canadian Installation 1	US Installation2	Description
A	12 in (30 cm)		Clearance above grade, verandah, porch, deck, or balcony.
B	12 in (30 cm)	9 in (23 cm)	Clearance from window or door that may be opened.
C	12 in (30 cm)*		Clearance from permanently closed window (to prevent
			condensation).
D	24 in (60 cm)*		Vertical clearance to ventilated soffit located above the
			terminal, within a horizontal distance of 2 ft (60 cm) from
			center line of terminal.
E	18 in (45 cm)*		Clearance to unventilated soffit.
F	12 in (30 cm)*		Clearance to outside corner.
G	12 in (30 cm)*		Clearance to inside corner.
H	3 ft (91 cm) within a height of	3 ft (91 cm) within a height of	Clearance to each side of center line extended above
	15 ft (4.5 m) above the meter/	15 ft (4.5 m) above the meter/	meter/regulator assembly.
	regulator assembly	regulator assembly*
I	3 ft (91 cm)	3 ft (91 cm)*	Radial clearance around service regulator vent outlet.
J	12 in (30 cm)	9 in (23 cm)	Clearance to non-mechanical air supply inlet to building, or
			the combustion air inlet to any other appliance.
K	6 ft (1.83 m)	3 ft (91 cm) above if within 10	Clearance to mechanical air supply inlet.
		ft (3 m) horizontally
L	7 ft (2.13 m)t	7 ft (2.13 m)*t	Clearance above paved sidewalk or paved driveway located
			on public property.
M	12 in / 30 cm+	12 in / 30 cm*+	Clearance under verandah, porch, deck, or balcony.
N	12 in (30 cm)*		Clearance horizontally to any surface (such as an exterior
			wall) for vertical terminations.
O	12 in (30 cm)		Clearance above roof line for vertical terminations.

1In accordance with the current CSA B149, Natural Gas and Propane Installation Code.

2 In accordance with the current ANSI Z223.1 NFPA 54, National Fuel Gas Code.

* These numbers are only estimates. Clearance in accordance with installation codes and the requirements of the gas supplier.

t A vent shall not terminate directly above a side walk or paved driveway that is located between two single family dwellings and it serves both dwellings. + Permitted only if verandah, porch, deck, or balcony is fully open on a minimum of two sides beneath the floor.

NOTE: Venting terminals shall not be recessed into walls or siding.

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