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Clearance Requirements from Vent Terminations to Building Openings
* All clearance requirements are in accordance with ANSI Z21.13 and the National Fuel Gas Code,
ANSI Z223.1 and in Canada, in accordance with NSCNGPIC.
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*Maintain clearances 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.
Clearance
Above grade, veranda, porch, deck,
or balcony
Window or door that may be opened
Permanently closed window
Vertical clearance to ventilated soffit
located above the terminal within a
horizontal distance of 2 feet from the
center of the terminal
Unventilated soffit
Outside corner
Inside corner
Each side of center line extended
above meter/regulator assembly
Service regulator vent outlet
Nonmechanical air supply inlet or
combustion air inlet to any other
appliance
Mechanical air supply inlet
Above paved sidewalk or paved
driveway located on public property
Under veranda, porch, deck, or
balcony
Vent Terminal
Air Supply Inlet
12" (12")
12" (36")
*
*
*
*
*
3' within a height 15' above
meter/regulator assembly
3'
12" (36")
3' above if within 10' (6')
(7' ***)
* (12"- Canada Only****)
Area Where Terminal
is Not Permitted
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