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16
For Horizontal Termination
Figure 16: Horizontal Vent Termination Location
# A=12 inches Clearance above the grade, a veranda, porch, deck, or balcony
# B=12 inches Clearance to window or door that may be opened.
C=12 inches Clearance to permanently closed window.
D*=18 inches Vertical clearance to ventilated soffit located above the terminal within a horizontal
distance of 2 feet from the centerline of the terminal.
E*=18 inches Clearance to unventilated soffits.
F=9 inches Clearance to an outside corner.
G=6 inches Clearance to an inside corner.
# H=3 feet Not to be installed above a gas meter/regulator assembly within 3 feet horizontally from
the centerline of the regulator.
# I=6 feet Clearance to service regulator vent outlet.
# J=12 inches Clearance to non-mechanical air supply inlet to building or the combustion air inlet to
any other appliance.
# K=6 feet Clearance to a mechanical air supply inlet
# L**=7 feet Clearance above a paved sidewalk paved driveway located on public property.
# M***=12 inches Clearance under veranda, porch, deck, or balcony.
# As specified in CGA B149 Installation Codes. Note: Local codes or regulations may
require different clearances.
* 30” minimum for vinyl clad soffits
** A vent must not terminate directly above a sidewalk or paved driveway, which is
located between two single-family dwellings and serves both dwellings.
*** Only permitted if veranda, porch, deck, or balcony is fully open on a minimum of 2
sides beneath the floor.