1-15
INSTALLATION
SFC BOILER / WATER HEATERS - SFC 199
1.4.7 “Direct Vent” Combustion Air Intake Piping
The unit must always be installed as a Direct Vent venting system with the
combustion air piped directly from the outdoors to the unit’s combustion air
connection. Provisions for combustion and ventilation air are in accordance with
the section “Air for Combustion and Ventilation,” of the
National Fuel Gas Code,
ANSI Z223.1/NFPA 54
, or Clause 8.2, 8.3 or 8.4 of
Natural Gas and Propane
Installation Code, CAN/CSA B149.1
, or applicable provisions of the local building
codes.
Figure 16: Direct vent combustion air intake
V
V
V
V
V
V
V
V
V
X
X
F
C
B
D
E
B
K
M
G
A
INSIDE
CORNER DETAIL
H
FIXED
CLOSED
OPERABLE
OPERABLE CLOSED
FIXED
B
J
A
B
B
B
V VENT TERMINAL
X AIR SUPPLY INLET
AREA WHERE TERMINAL IS NOT PERMITTED
I
L
Figure 15: Vent Terminal Clearance
NOTE
Combustion air connection may
be moved from one side to the
other:
- Lift tab at back of plug.
- Rotate counter-clockwise 1/8th
of a turn.
- Lift plug out of cabinet and
move to other opening: rotate
plug and push down tab to lock
in place.
