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V =VENT TERMINAL
X =AIR SUPPLY INLET
=AREA WHERE TERMINAL IS NOT PERMITTED
A = 12" clearances above grade, veranda, porch, deck or balcony
B = 12" clearances to window or door that may be opened
C = 9" (U.S.A.) clearance to permanently closed window
12" (Canada)
*D = 18" vertical clearance to ventilated soffit located above the
terminal within a horizontal distance of 2 feet (60 cm)
from the center-line of the terminal
*E = 18" clearance to unventilated soffit
F = 9" clearance to outside corner
G = 6" clearance to inside corner
H = 3 ft. (Canada) not to be installed above a gas meter/regulator assembly
within 3 feet (90 cm) horizontally from the center-line of
the regulator
I = 3 ft. (U.S.A.) clearance to service regulator vent outlet
6 ft. (Canada)
J = 9" (U.S.A.) clearance to non-mechanical air supply inlet to building
12" (Canada) or the combustion air inlet to any other appliance
K = 3 ft. (U.S.A.) clearance to a mechanical air supply inlet
6 ft. (Canada)
**L = 7 ft. clearance above paved sidewalk or a paved driveway
located on public property
***M = 18" clearance under veranda, porch, deck or balcony
* 30 minimum for vinyl clad soffits.
** a vent shall 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.
NOTE: Local Codes or Regulations may require different clearances.
Figure 26. Vent Termination Minimum Clearances
CAUTION
IF EXTERIOR WALLS ARE FINISHED WITH
VINYL SIDING, IT IS NECESSARY TO INSTALL
THE VINYL PROTECTOR KIT TO THE TOP OF
THE EXTERIOR FIRESTOP (FOR ALL ROUND
TERMINATION CAPS).
D
E
B
L
v
v
v
v
v
v
v
v
openable
C
B
B
B
fixed closed
A
H
M
X
J or K
I
A
G
F