MACH® Series
Gas-Fired Boiler
Installation
Page 11
3.6.6. Direct Vent (Sealed Combustion)
Systems
The vent terminal shall be located at least 12 in. from
any air opening into a building. The bottom of the
vent terminal shall be at least 12 in. above grade. Both
the vent and air intake terminals must be at least 12 in.
above the highest expected snow line.
Through the wall terminations shall not terminate over
public walkways. Maintain a minimum clearance of 4
ft (1.22 m) horizontally from any electric of gas meter,
regulator or relief equipment.
3.6.7 Sidewall Venting with Sealed
Combustion
The MACH C1500/C2000 Boilers are certified for
direct sidewall venting with a sidewall air inlet
only.
Both the air inlet and the exhaust vent must terminate
on the same wall of the building and must utilize the
same type of termination fitting with the same
orientation. Allowable termination fittings are: 90
°
elbows, tees, or straight vents.
Do not install this boiler with sidewall vent and room
air inlet!
The air inlet and vent must be sized so that the total
pressure loss for the combined inlet and vent ducts
does not exceed 0.44” w.c.. For example, if the inlet
air duct loss is 0.2” w.c., the vent duct loss cannot
exceed 0.24 “w.c.. The vent should be sized using a
gross vent temperature of 185°F, a CO2 level of 9.2%
and the residual vent pressure loss as indicated above.
The air inlet duct should be sized as indicated in
paragraph 3.6.8.
Typical
Sidewall
venting.
Vent Installation Details
This Installation must conform to the vent
manufacturer's instructions in all respects including
joining, clearances, fastening, fire-stopping, and other
matters.
Sidewall Penetration Detail
Vent Manufacturers
Wall Penetration Kit
12" min.
3’ min.
