Direct-vent fireplace (natural/propane/lp), General venting, Continued – Desa BHDV37NC User Manual

Page 6

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6

106517

DIRECT-VENT FIREPLACE (NATURAL/PROPANE/LP)

®

Fixed

Closed

Openable Fixed

Closed

Openable

V

V

V

V

V

V

V

V

X

X

V

X

G

G

J

F

B

B

K

N

H

I

A

N

E

L

D

B

M

A

C

B

V

V

A

G

G

B

TERMINATION CAP

AIR SUPPLY INLET

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

A = 6" (152mm)

Inside Corner

V

B

E

V

B = 6" (152mm)

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)

Outside Corner

Recessed Location

G

H

G = Combustible 24" (610mm)

Noncombustible 18" (457mm)

Balcony with No Side Wall

V

J

Combustible &
Noncombustible
H = 24" (610mm)
J = 20" (508mm)

Balcony with Perpendicular Side Wall

C

D

C

Termination Clearances for Buildings with Combustible and Noncombustible Exteriors

Figure 8 - Minimum Clearances for Vent Terminations

GENERAL VENTING

Continued

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