Venting Continued
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CDN Installation
12in (30cm)
3ft (91cm)
12in (30cm)
6ft (1.83m)
7ft (2.13m)t
12in/30cm+
US Installation
9in (23cm)
3ft (91cm)*
9in (23cm)
7ft (2.13m)*t
12in/30cm*+
Description
Clearance above grade, verandah, porch, deck, or balcony.
Clearance from window or door that may be opened.
Clearance from permanently closed window
(to prevent condensation).
Vertical clearance to ventilated soffit located above the
terminated within a horizontal distance of 2feet (60cm)
from the center line of terminal.
Clearance to unventilated soffit.
Clearance to outside corner.
Clearance to inside corner.
Clearance to each side of center line extended above
meter/regulator assembly.
Radially clearance around service regulator vent outlet.
Clearance to non-mechanical air supply inlet to building,
or the combustion air inlet to any other appliance.
Clearance to mechanical air supply inlet.
Clearance above paved sidewalk or paved driveway
located on public property.
Clearance under verandah, porch, deck, or balcony.
12in (30cm)
12in (30cm)*
24in (60cm)*
18in (45cm)*
2in (5cm)
2in (5cm)*
3ft (91cm) within a height of
15ft (4.5m) above the meter/
regulator assembly.
3ft (91cm) within a height of
15ft (4.5m) above the meter/
regulator assembly.*
3ft (91cm) above if within 10ft
(3m) horizontally.
1 In accordance with the current CSA B149.1, Natural Gas and Propane Installation Code.
2 In accordance with the current ANSI 2223.1 NFPA S4, National Fuel Gas Code.
* These Numbers are only estimates. Clearance in with installation codes and the requirements of the gas supplier.
f A vent shall not terminate directly above a sidewalk or paved driveway that is located between two single
family dwellings and it serves both dwellings.
+ Permitted only if verandah, porch, deck, or balcony is fully open on a minimum of two sides beneath the floor.
NOTE: Venting terminals shall not be recessed into walls or siding.
QUALIFIED INSTALLERS ONLY
When planning an installation it will be necessary to select to proper
length of vent pipe for the particular requirements. It is important to note that, when passing Simpson Duravent
pipe through a wall thimble (p/n 942) maybe required in Canada. Check local codes. Flex pipe installations
require Mill-Pac sealant on exhaust joints. Flex pipe joints must be secured with screw fasteners in addition
to sealant adhesives.
