Century Jefferson manual General Venting Information Termination Location

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.

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