Jefferson Direct Vent /Natural Vent Gas Heater

General Venting Information - Termination Location

D

E

V

L

B

CFM145a

C

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F

V

Operable

 

B

 

INSIDE

 

 

 

 

CORNER DETAIL

 

 

 

 

G

 

 

 

 

 

V

 

 

 

N

A

 

 

H

N

 

 

 

 

 

 

 

B

 

 

 

 

 

V

 

B

V

 

 

Operable

Fixed

 

 

 

 

Closed

 

 

 

 

 

 

 

 

 

V J

B

M

 

B

X

 

 

V K X

 

A

 

I

 

 

 

 

 

 

V VENT TERMINATION X AIR SUPPLY INLET AREA WHERE TERMINAL IS NOT PERMITTED

 

 

 

Canadian Installations1

US Installations2

 

A =

Clearance above grade, veranda, porch,

12” (30cm)

12” (30cm)

 

 

deck, or balcony

 

 

 

B = Clearance to window or door that may be

6” (15cm) for appliances

6” (15cm) for appliances

 

 

opened

< 10,000Btuh (3kW), 12” (30cm)

< 10,000 Btuh (3kW), 9”

 

 

 

for appliances > 10,000 Btuh (3kW) and

(23cm) for appliances > 10,000

 

 

 

< 100,000 Btuh (30kW), 36” (91cm)

Btuh (3kW) and < 50,000 Btuh

 

 

 

for appliances > 100,000 Btuh (30kW)

(15kW), 12” (30cm) for

 

 

 

 

appliances > 50,000 Btuh (15kW)

 

C = Clearance to permanently closed window

12” (305mm) recommended to

12” (305mm) recommended to

 

 

 

prevent window condensation

prevent window condensation

 

D = Vertical clearance to ventilated soffit located

 

 

 

 

above the terminal within a horizontal

18” (458mm)

18” (458mm)

 

 

distance of 2’ (610mm) from the center

 

 

 

 

line of the terminal

 

 

 

E = Clearance to unventilated soffit

12” (305mm)

12” (305mm)

 

F =

Clearance to outside corner

see next page

see next page

 

G = Clearance to inside corner (see next page)

see next page

see next page

 

H = Clearance to each inside of center line

3’ (91cm) within a height of 15’ (5m)

3’ (91cm) within a height of 15’

 

 

extended above meter/regulator assembly

above the meter/regulator assembly

(5m) above the meter/regulator

 

 

 

 

assy

 

I =

Clearance to service regulator vent outlet

3’ (91cm)

3’ (91cm)

 

J =

Clearance to nonmechanical air supply inlet

6” (15cm) for appliances < 10,000

6” (15cm) for appliances

 

 

to building or the combustion air inlet to any

Btuh (3kW), 12” (30cm) for

< 10,000 Btuh (3kW), 9”

 

 

other appliances

appliances > 10,000 Btuh (3kW) and <

(23cm) for appliances > 10,000

 

 

 

100,000 Btuh (30kW), 36” (91cm)

Btuh (3kW) and < 50,000 Btuh

 

 

 

for appliances > 100,000 Btuh (30kW)

(15kW), 12” (30cm) for

 

 

 

 

appliances > 50,000 Btuh (15kW)

 

K =

Clearance to a mechanical air supply inlet

6’ (1.83m)

3’ (91cm) above if within 10’

 

 

 

 

(3m) horizontally

 

L =

Clearance above paved sidewalk or paved

7’ (2.13m)†

7’ (2.13m)†

 

 

driveway located on public property

 

 

 

M = Clearance under veranda, porch, deck or

12” (30cm)‡

12” (30cm)‡

 

 

balcony

 

 

N = Clearance above a roof shall extend a minimum of 24” (610mm) above the highest point when it passes through the roof surface, and any other obstruction within a horizontal distance of 18” (450mm).

1 In accordance with the current CSA-B149 Installation Codes

2 In accordance with the current ANSI Z223.1/NFPA 54 National Fuel Gas Codes

A vent shall not terminate directly above a sidewalk or paved driveway which is located between two single family dwellings and serves both dwellings

‡ only permitted if veranda, porch, deck or balcony is fully open on a minimum 2 sides beneath the floor: NOTE: 1. Local codes or regulations may require different clearances.

2.The special venting system used on Direct Vent Stoves are certified as part of the appliance, with clearances tested and approved by the list- ing agency.

3.CFM Corporation assumes no responsibility for the improper performance of the appliance when the venting system does not meet these requirements.

Fig. 9 Vent termination clearances.

30004177

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Century Jefferson manual General Venting Information Termination Location, Canadian Installations1 US Installations2