11
Installation Clearances
Chapter 3. – Safety Requirements
Description
US Direct Vent
Installations
1
Canadian Direct Vent
Installations
2
A
Clearance above grade, veranda, porch, deck, or balcony
12 in (30 cm)
12 in (30 cm)
B
Clearance to window or door that may be opened
12 in (30 cm)
36 in (91 cm)
C
Clearance to permanently closed window
*
*
D
Vertical clearance to ventilated soffit located above the terminal within
a horizontal distance of 2 feet from the center line of the terminal
*
*
E
Clearance to unventilated soffit
*
*
F
Clearance to outside corner
*
*
G
Clearance to inside corner
*
*
H
Clearance to each side of center line extended above meter/regulator
assembly
*
3 ft (91 cm) within a
height 15 ft above the
meter/regulator assembly
I
Clearance to service regulator vent outlet
*
3 ft (91 cm)
J
Clearance to non-mechanical air supply inlet to building or the combus-
tion air inlet to any other appliance
12 in (30 cm)
36 in (91 cm)
K
Clearance to a mechanical air supply inlet
3 ft (91 cm) above if
within 10 ft (3 m) hori-
zontally
6 ft (1.83 m)
L
Clearance above paved sidewalk or paved driveway located on public
property
*
7 ft (2.13 m)
†
M
Clearance under veranda, porch, deck, or balcony
*
12 in (30 cm)
‡
Clearance Requirements from Vent Terminations to Building Openings
<When supplying combustion air from the outdoors (Direct Vent)>
1 In accordance with the current ANSI Z223.1 / NFPA 54 National Fuel Gas Code.
2 In accordance with the current CSA B149.1 Natural Gas and Propane Installation Code.
† A vent shall not terminate directly above a sidewalk or paved driveway that is located between two single family dwellings and serves
both dwellings.
‡ Permitted only if veranda, porch, deck, or balcony is fully open on a minimum of two sides beneath the floor.
* Clearance in accordance with local installation codes and the requirements of the gas supplier. Clearance to opposite wall is 24 inches (60 cm).
Summary of Contents for Eco TOUGH NRCP111-DV-LP
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