Desa CDVBNC, CDVBPC installation manual General Venting

10

GENERAL VENTING

Location Of Vent Termination (Cont.)

GENERAL VENTING Continued

D

E V

B L

C

H

N

N

	Fixed	V
	Closed
F	Openable
	V

B

Openable Fixed

Closed

V

B

I

G

B

B

V J X G

A

M

V

K X

V

G V A

V TERMINATION CAP X AIR SUPPLY INLET G GAS METER

RESTRICTED AREA (TERMINATION PROHIBITED)

A= clearance above grade, veranda, porch, deck, or balcony [*12 inches (305mm) minimum]

B= clearance to window or door that may be opened

[12 inches (305mm) minimum]

C = clearance to permanently closed window [minimum 12 inches (305mm) recommended to prevent condensation on window]

D = vertical clearance to ventilated soffit located above the terminal within a horizontal distance of 24 inches (610mm) from the center-line of the terminal [18 inches (457mm) minimum]

E= clearance to unventilated soffit [12 inches (305mm) 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 (914mm) horizontally from the center-line of the regulator

I= clearance to service regulator vent outlet [*72 inches (1829mm) minimum]

J= clearance to non-mechanical air supply inlet to building or the combustion air inlet to any other fireplace [*12 inches (305mm) minimum]

K= clearance to a mechanical air supply inlet [*72 inches (1829mm) minimum]

L= † clearance above paved side-walk or a paved driveway located on public property [*84 inches (2133mm) minimum]

M= clearance under veranda, porch, deck [*12 inches (305mm) minimum ‡ ]

N= clearance above a roof shall extend a minimum of 24 inches (610mm) above the highest point when it passes through the roof surface and any other obstruction within a horizontal distance of 18 inches (457mm)

†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/SGA B149 (.1 or .2) Installation Codes (1991) for Canada or for U.S.A. installation follow the current National Fuel Gas Code, ANS Z223.1

Note: Local codes or regulations may require different clearances

Termination Clearances for Buildings with Combustible and Noncombustible Exteriors

Inside Corner

A A = 6" (152mm)

V

Outside Corner

V

B B = 6" (152mm)

Recessed Location

D

C C

E

V

Balcony with No Side Wall

G

V

G = Combustible 24" (610mm) Noncombustible 18" (457mm)

Balcony with Perpendicular Side Wall

H

V

J

Combustible &

Noncombustible

H = 24" (610mm)

J = 20" (508mm)

C = Maximum depth of 48" (1219mm) for recessed location

D = Minimum width for back wall of recessed location - Combustible - 38" (965mm) Noncombustible - 24" (610mm)

E = Clearance from corner in recessed location- Combustible - 6" (152mm) Noncombustible - 2" (51mm)

Figure 18 - Minimum Clearances for Vent Terminations

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105501-01F