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Reference Clearance Description
US Install
Canada Install
A
Above grade, veranda, porch, deck, or balcony
12 inches (300 mm)
12 inches (300 mm)
B
To window or door that may be opened
12 inches (300 mm)
36 inches (910 mm)
C
Permanently closed window
*
*
D
Vertical to ventilated soffit, located above the
terminal within a horizontal distance of 2 feet (61 cm)
from the center line of the terminal
*
*
E
To unventilated soffit
*
*
F
To outside corner
*
*
G
To inside corner
*
*
H
To each side of center line extended above meter
regulator assembly
*
3 feet (910 mm) within a
height 15 feet (4.5 m)
above the meter/
regulator assembly
I
To service regulator vent outlet
*
36 inches (910 mm)
J
To non-mechanical air supply inlet to building or the
combustion air inlet to any other appliance
12 inches (300 mm)
36 inches (910 mm)
K
To a mechanical air supply inlet
3 feet (91 cm) above if
within 10 feet (3 m)
horizontally
6 feet (1.83 m)
L
Above paved sidewalk or paved driveway located on
public property
*
7 feet (2.13 m) **
M
Under veranda, porch, deck, or balcony
*
12 inches (300 mm)
THIS TABLE IS PROVIDED FOR REFERENCE ONLY. Please consult latest version of these standards to ensure installation is in
compliance with current guidelines.
* For clearances not specified in
ANS Z223.1/NFPA 54
or
CSA B149.1
, clearances are in accordance with local installation codes and
the requirements of the gas supplier.
** 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.
Figure 6 - ANS Z21.10.3 / CSA 4.3
Summary of Contents for AHG-T42-LP
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