Johnson Controls GG9S*MP Vent Clearances, Home Layout, Direct Vent Terminal Clearances, Fixed

364861-UIM-B-0708

VENT CLEARANCES

D		FIXED
	E	CLOSED
V
L	V	B
		C
			V
		F	V

B

FIGURE 28: Home Layout

G

V

A

H

B B

BI

V

V	X
	V
	J

B

OPERABLE

M	X
	V
	K

FIXED

CLOSED

VVENT TERMINAL

XAIR SUPPLY

AREA WHERE TERMINAL IS NOT PERMITTED

Direct Vent Terminal Clearances		Canadian Installations1,3	US Installation2,3
A. Clearance above grade, veranda, porch, deck, or		12 inches (30 cm)	12 inches (30 cm)
	balcony
			Two-pipe (direct vent) applications: 9 inches (23 cm)
B. Clearance to window or door that may be opened		12 inches (30 cm) for models ≤100,000 BTUH (30 kW),	for models ≤50,000 BTUH (15 kW), 12 inches (30 cm)
		36 inches (91 cm) for models >100,000 BTUH (30 kW)	for models >50,000 BTUH (15 kW). ††
			Single-pipe applications: 4 feet
C. Clearance to permanently closed window		12 inches (30 cm)	12 inches (30 cm)
D. Vertical clearance to ventilated soffit located		12 inches (30 cm) or in accordance with local	12 inches (30 cm) or in accordance with local
	above the terminal within a horizontal distance	installation codes and the requirements of the gas	installation codes and the requirements of the gas sup-
	of 2 feet (61 cm) from the center line of the terminal	supplier.	plier
		12 inches (30 cm) or in accordance with local	12 inches (30 cm) or in accordance with local
E. Clearance to unventilated soffit		installation codes and the requirements of the gas	installation codes and the requirements of the gas
		supplier	supplier
		12 inches (30 cm) or in accordance with local	12 inches (30 cm) or in accordance with local
F.	Clearance to outside corner	installation codes and the requirements of the gas	installation codes and the requirements of the gas
		supplier	supplier
G. Clearance to inside corner		3 feet (91 cm)	3 feet (91 cm)
		Above a meter/regulator assembly within 3 feet (91 cm)	Above a meter/regulator assembly within 3 feet (91
H. Clearance to each side of center line		horizontally of the vertical center-line of the regulator	cm) horizontally of the vertical center-line of the regula-
	extended above meter/regulator assembly	vent outlet to a maximum vertical distance of 15 feet	tor vent outlet to a maximum vertical distance of 15
		(4.5 cm) above the meter/regulator assembly.	feet (4.5 cm) above the meter/regulator assembly.
I.	Clearance to service regulator vent outlet	3 feet (91 cm)	3 feet (91 cm) or in accordance with local installation
			codes and the requirements of the gas supplier.
J. Clearance to nonmechanical air supply inlet to			Two-pipe (direct vent) applications: 9 inches (23 cm)
		12 inches (30 cm) for models ≤100,000 BTUH (30 kW),	for models ≤50,000 BTUH (15 kW), 12 inches (30 cm)
	building or the combustion air inlet to any other
	appliance	36 inches (91 cm) for models >100,000 BTUH (30 kW)	for models >50,000 BTUH (15 kW).
			Single-pipe applications: 4 feet
K. Clearance to a mechanical supply inlet		6 feet (1.83 m)	3 feet (91 cm) above if within 10 feet (3 cm)
			horizontally
L.	Clearance above paved sidewalk or paved	7 feet (2.13 m)†	7 feet (2.13 m) or in accordance with local installation
	driveway located on public property		codes and the requirements of the gas supplier.
M. Clearance under veranda, porch, deck, or balcony		12 inches (30 cm)‡	12 inches (30 cm) or in accordance with local installa-
			tion codes and the requirements of the gas supplier.

1.In accordance with the current CSA B149.1-00, Natural Gas and Propane Installation Code.

2.In accordance with the current ANSI Z223.1 / NFPA 54, National Gas Code.

3.In accordance with the current ANSI Z21.47 * CSA 2.3 American National Standard.

†A vent shall not terminate directly above a sidewalk or paved driveway that is located between two single family dwellings and serves both dwellings. †† 12 inches (30 cm) up from the bottom edge of the structure for Two-pipe (direct vent) applications per ANSI Z223.1 / NFPA 54, National Gas Code.

‡ Permitted only if veranda, porch, deck, or balcony is fully open on a minimum of two sides beneath the floor and the distance between the top of the vent termina- tion and the underside of the veranda, porch, or deck is greater than 1 foot (30 cm) as specified in CSA B149.1-00.

A vent shall not terminate less than 1 foot (30 cm) above a grade level.

Any fresh air or make up inlet for dryer or furnace area is considered to be forced air inlet.

Avoid areas where condensate drippage may cause problems such as above planters, patios, or adjacent to windows where steam may cause fogging.

A terminus of a vent shall be fitted with a cap in accordance with the vent manufacturer’s installation instructions, or in accordance with the installation instructions for a special venting system.

Responsibility for the provision of proper adequate venting and air supply for application shall rest with the installer.

Vent shall extend high enough above building, or a neighboring obstruction, so that wind from any direction will not create a positive pressure in the vicinity of the vent.

Consideration must be given for degradation of building materials by flue gases. Sidewall termination may require sealing or shielding of building surfaces with a corro- sion resistant material to protect against combustion product corrosion. Consideration must be given to wind direction in order to prevent flue products and/or conden- sate from being blown against the building surfaces. If a metal shield is used it must be a stainless steel material at a minimum dimension of 20 inches. It is recommended that a retaining type collar be used that is attached to the building surface to prevent movement of the vent pipe.

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