Installation Guide

19
I&O manual
IMPORTANT
† 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” (30.5 cm) up from the bottom edge of the structure for Two- pipe (direct vent) applications per ANSI Z223.1 / NFPA 54, Nat ional 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 gr eater than 12” (30.5 cm) as specified in CSA B149.1-00.
A vent shall not terminate less than 12” (30.5 cm) above a grade level.
Any fresh air or make up inlet for dryer or fu rnace area is considered to be forced air inlet.
Avoid areas where condensate dri ppage 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 wit h the vent manufacturer’s installation instructions, or in acc ordance 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 p ositive pressure in the vicinity of the vent.
Fig 19: Home Layout
L
E
D
B
B
J
B
B
B
F
C
B
X
V
I
G
H
A
M
K
OPERABLE
FIXED
CLOSED
VENT TERMINAL
AIR SUPPLY
AREA WHERE TERMINAL IS NOT PERMITTED
FIXED
CLOSED
Direct Vent Terminal Clearances
Canadian Installations
1,3
US Installation
2,3
A. Clearance above grade, veranda, porch, deck, or
balcony
12” (30.5 cm) 12” (30.5 cm)
B. Clearance to window or door that may be opened
12” (30.5 cm) for models 100,000 BTUH (30 kW),
36” (91 cm) for models >100,000 BTUH (30 kW).
Two-pipe (direct vent) applications: 9” (23 cm) for
models 50,000 BTUH (15 kW), 12” (30.5 cm) for
models >50,000 BTUH (15 kW). ††
Single-pipe applications: 4 feet (1.2 m).
C. Clearance to permanently closed window 12” (30.5 cm) 12” (30.5 cm)
D. Vertical clearance to ventilated soffit located
above the terminal within a horizontal distance
of 2 feet (61 cm) from the center line of the terminal
12” (30.5 cm) or in accord ance with local installation
codes and the requirements of the gas supplier.
12” (30.5 cm) or in accordance with local installation
codes and the requirements of the gas supplier.
E. Clearance to unventilated soffit
12” (30.5 cm) or in accord ance with local installation
codes and the requirements of the gas supplier
12” (30.5 cm) or in accordance with local installation
codes and the requirements of the gas supplier.
F. Clearance to outside corner
12” (30.5 cm) or in accord ance with local installation
codes and the requirements of the gas supplier.
12” (30.5 cm) or in accordance with local installation
codes and the requirements of the gas supplier.
G. Clearance to inside corner 36” (91.4 cm) 36” (91.4 cm)
H. Clearance to each side of center line
extended above meter/regulator assembly
Above a meter/regulator assembly within 36” (91.4 cm)
horizontally of the vertical center-line of the regulator
vent outlet to a maximu m vertical distance of
15 feet (4.5 m) above the meter/regulator assembly.
Above a meter/regulator assembly within 36” (91.4 cm)
horizontally of the vertical center-line of the regulator
vent outlet to a maximum vertical distance of 15 feet
(4.5 m) above the meter/regulator assembly.
I. Clearance to service regulator vent outlet 36” (91.4 cm)
36” (91.4 cm) or in accordance with local installation
codes and the requirements of the gas supplier.
J. Clearance to nonmechanical air supply inlet to
building or the combustion air inlet to any other
appliance
12” (30.5 cm) for models 100,000 BTUH (30 kW),
36” (91.4 cm) for models >100,000 BTUH (30 kW).
Two-pipe (direct vent) applications: 9“ (23 cm) for
models 50,000 BTUH (15 kW), 12” (30.5 cm) for
models >50,000 BTUH (15 kW).
Single-pipe applications: 4 feet (1.2 m).
K. Clearance to a mechanical supply inlet 6 feet (1.83 m)
3 feet (91.4 cm) above if within 10 feet (3 m)
horizontally.
L. Clearance above paved sidewalk or paved
driveway located on public property
7 feet (2.13 m)†
7 feet (2.13 m) or in accordance with local installation
codes and the requirements of the gas supplier.
M. Clearance under veranda, porch, deck, or balcony 12” (30.5 cm)‡
12” (30.5 cm) or in accordance with local installation
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.
Consideration must be given for degradation of building materials by flue gases. Sidewall termination may require sealing or sh ielding of building surfaces with a cor-
rosion resistant material to protect agains t combustion product corrosion. Considerati on must be given to wind direction in ord er to prevent flue products and/or con-
densate from being blown against the building surfaces. If a metal shield is used it must be a stainless steel material at a mi nimum dimension of 20 inches (51 cm). It
is recommended that a retaining type collar be used that is atta ched to the building surface to prevent movement of the vent pi pe.
VENT CLEARANCES