General Venting | Desa SDVBPD, SDVBND instruction

GENERAL VENTING

GENERAL VENTING Continued

E V

B L

		Fixed	V
		Closed	V
		Closed
F	V	Openable

Openable

Fixed

Closed

V J X

K X

G V A

V TERMINATION CAP

X AIR SUPPLY INLET

GAS METER

RESTRICTED AREA (TERMINATION PROHIBITED)

A= clearance above grade, veranda, porch, deck, or balcony [*12 inches (30.5mc) minimum]

B= clearance to window or door that may be opened

[12 inches (30.5cm) minimum]

C = clearance to permanently closed window [minimum 12 inches (30.5cm) recommended to prevent condensation on window]

D = vertical clearance to ventilated soffit located above the terminal within a horizontal distance of 24 inches (61cm) from the center-line of the terminal [18 inches (45.7cm) minimum]

E= clearance to unventilated soffit [12 inches (30.5cm) minimum]

F= clearance to outside corner (see below)

G= clearance to inside corner (see below)

H= *not to be installed above a meter/regulator assembly within

36 inches (91.4cm) horizontally from the center-line of the regulator

I= clearance to service regulator vent outlet [*72 inches (182.9cm) minimum]

J= clearance to non-mechanical air supply inlet to building or the combustion air inlet to any other fireplace [*12 inches (30.5cm) minimum]

K= clearance to a mechanical air supply inlet [*72 inches (182.9cm) minimum]

L= clearance above paved side-walk or a paved driveway located on public property [*84 inches (213.3cm) minimum]

M= clearance under veranda, porch, deck [*12 inches (30.5cm) minimum ]

N= clearance above a roof shall extend a minimum of 24 inches (61cm) above the highest point when it passes through the roof surface and any other obstruction within a horizontal distance of 18 inches (45.7cm)

vent shall not terminate directly above a side-walk or paved driveway which is located between two single family dwellings and serves both dwellings*

only permitted if veranda, porch, deck or balconey is fully open on a minimum of 2 sides beneath the floor*

*as specified in CAN/CSA B149 (.1 or .2) Installation Codes (1991) for Canada and U.S.A. Note: Local codes or regulations may require different clearances

Termination Clearances for Buildings with Combustible and Noncombustible Exteriors

Inside Corner

A		A = 6" (15.2cm)

Outside Corner

B B = 6" (15.2cm)

Recessed Location

Balcony with No Side Wall

G = 12" (30.5cm) minimum clearance

Balcony with Perpendicular Side Wall

Combustible &

Noncombustible

H = 24" (61cm)

J = 20" (50.8cm)

C = Maximum depth of 48" (121.9cm) for recessed location

D = Minimum width for back wall of recessed location - Combustible - 38" (965mm) Noncombustible - 24" (61cm)

E = Clearance from corner in recessed location- Combustible - 6" (15.2cm) Noncombustible - 2" (5.1cm)

Figure 20 - Minimum Clearances for Vent Terminations

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112126-01B

SDVBPD, SDVBND specifications

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