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FIGURE 21
VENT TERMINATION CLEARANCES
(AS 5601)
A −
Clearance above ground level
− 305mm.
B −
Clearance horizontally to window or door
that may be
opened − 305mm minimum for appliances up to 150Mj/h;
Clearance vertically below a window that may be opened −
1000mm minimum for appliances up to 150Mj/h.
C −
Clearance below eaves, balconies and other projections −
305mm.
D −
Clearance to electric meters, gas meters, regulators and re-
lief equipment
−
1000
mm minimum.
E −
Clearance to non−mechanical air supply inlet or outlet
−
300mm minimum horizontal and 1000mm minimum verti-
cally for appliances up to 150Mj/h;
F −
Clearance to mechanical air supply inlet
including a spa
blower −− 1000mm minimum.
G −
Do not point terminations into recessed areas such as win-
dow wells, stairwells or alcoves.
H −
Do not position terminations directly above a walkway.
less than
10 ft (3.048M)
C
D
D
E
F
−
G61MPVT VENT TERMINATION
−
AIR INLET OF OTHER APPLIANCE
Details of Intake and Exhaust Piping Terminations for
Direct Vent Installations
NOTE − In Direct Vent installations, combustion air is taken
from outdoors and flue gases are discharged to outdoors.
Intake and exhaust pipes may be routed either horizontally
through an outside wall or vertically through the roof. In at-
tic or closet installations, vertical termination through the
roof is preferred. Figures 22 through 25 show typical ter-
minations.
1 − Exhaust and intake exits must be in same pressure
zone. Do not exit one through the roof and one on the
side. Also, do not exit the intake on one side and the
exhaust on another side of the house or structure.
2 − Intake and exhaust pipes should be placed as close
together as possible at termination end (refer to il-
lustrations). Maximum separation is 76mm (3 inches)
on roof terminations and 152mm (6 inches) on side
wall terminations.
3 − If necessary, install a field−provided transition to adapt
larger vent pipe size to termination pipe size.
4 − On roof terminations, the intake piping should termi-
nate straight down using two 90° elbows (See figure
22).
5 − Exhaust piping must terminate straight out or up as
shown. In rooftop applications, a reducer may be re-
quired on the exhaust piping at the point where it exits
the structure to improve the velocity of exhaust away
from the intake piping. See table 7.
NOTE − Care must be taken to avoid recirculation of
exhaust back into intake pipe.
6 − On field supplied terminations for side wall exits, ex-
haust piping should extend a maximum of 305mm (12
inches) beyond the outside wall unless supported. In-
take piping should be as short as possible.
