Item

Clearance Descriptions

AClearance above grade, veranda, porch, deck, balcony, or anticipated snow level

BClearance to a window or door that may be opened

CClearance to a permanently closed window

DVertical clearance to a ventilated soffit located above the

terminal within a horizontal distance of 2'(61cm) from the centedine of the terminal

EClearance to an unventilated soffit

FClearance to an outside corner

GClearance to an inside comer

HClearance to each side of the centedine extended above electrical meter or gas service regulator assembly

I

Clearance to service regulator vent outlet

Canadian Installation (1)

12" (30cm)#

6" (15 cm) for appliances _< 10,000 BTUH (3kW), 12" (30 cm) for appliances > 10,000 Btuh (3 kW) and _<100,000 Btuh (30 kW), 36" (01 cm) for appliances > 100,000 Btub (30 kW)

*

*

*

*

*

3'(91 cm) within 15' (4.5 m) above the meter/regulator assembly

3'(01 cm)

U.S. Installation (2)

12" (30 cm)

4'(1,2 m) below or to the side of the opening. 1'(30 cm) above the opening.

3'(91 cm) within 15' (4.fi m) above the meter/regulator assembly

J

Clearance to non-mechanical air supply inlet to building or

 

the combustion air inlet to any other appliance

6" (15cm)forappliances_<10,OOOBTUH(3kW),12" (30

4'(1.2 m) below or to the side of opening: 1'(30 cm) above

cm) for appliances> 10,000Btub(3kW) and _<100,000Btuh

opening.

(30 kW),36" (91 cm) for appliances> 100,000Btuh(30 kW)

 

K

Clearance

to a mechanical

 

air supply inlet

6'(1.83m)

3'(01 cm) above if within 10' (3m horizontally)

L

Clearance

under a veranda,

porch, deck,

or balcony

12" (30 cm)

+

M

Clearance

to each side of the centedine

extended above or

*

 

 

below vent terminal of the furnace to a dryer or water heater

 

 

vent, or other appliance's direct vent intake or exhaust.

 

 

N

Clearance

from a plumbing

vent stack

 

3'(91 cm)

3'(91 cm)

(1.)

In accordance with the currenl

CSA B149.1, Natural Gas and Propane Installation Code

(2,)

In accordance

with the current

ANSI Z223.1/NFPA fi4, Nafional

Fuel Gas Cede

 

#18" (46 cm) above roof surface

 

+

Permitted

only if veranda, porch, deck, or balcony is fully

open

on a minimum of two sides

beneath the

floor.

i

 

For clearances not specified in ANSI Z223.1/NFPA 54 or CSA B149.1, clearances shall be in accordance with local installation codes and the requirements of the gas supplier and the manufacture's

 

installation

instructions.

 

 

 

 

 

 

 

 

 

Notes:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1,

The

vent for this appliance shall

not terminate

 

 

 

 

 

 

 

 

 

a. Over public walkways; or

 

 

 

 

 

 

 

 

 

 

 

b.

Near soffit vents or crawl space vents

or other areas where condensate

or vapor could

create

a nusiance or hazard or property damage; or

 

 

c. Where condensate vapor could cause damage or could be detrimental to the operafion of regulators, relief valves, or other equipment.

 

2.

When

locating

vent terminations,

consideration

must

be given to prevailing

winds, location,

and other conditions which may cause recirculation of the combusfiob products of adjacent vents.

 

Recirculafion

can cause poor combustion,

inlet

condensate

problems, and

accelerated

corrosion

of the heat exchangers.

[_

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