Room Air - Crest Audio FB(N,L)1500 Installation & Operation Manual

4
Sidewall direct venting
2. Place wall penetrations to obtain minimum clearance
of 12 inches (305 mm) between vent pipe and adjacent
air inlet, as shown in FIG. 4-4 for U.S. installations. For
Canadian installations, provide clearances required by
CSA B149.1 Installation Code.
3. The air inlet of a Crest is part of a direct vent
connection. It is not classified as a forced air intake
with regard to spacing from adjacent boiler vents.
Figure 4-4 Multiple Vent Terminations (must also
comply with Figure 4-1)
36" MIN
48" MAX
12"
12" MIN
Figure 4-5 Direct Vent Terminations
DIRECT VENT TERMINATIONS
Air Inlet
Dryer Inlet
90° Elbow
VENT
AIR
12"
36"
Vent Termination
Straight
Mitered
23° Elbow
Installation & Operation Manual
(continued)
Figure 4-6 Room Air (Direct Exhaust Terminations)
ROOM AIR (DIRECT EXHAUST TERMINATIONS)
Vent Termination
23° Elbow
45° Elbow
90° Elbow

Room air

The Crest boiler may be installed with a single pipe carrying the
flue products to the outside while using combustion air from
the equipment room.
Follow the requirements in the General Venting, Sidewall Direct
Venting, and Vertical Direct Venting sections for vent material
specifications, vent length requirements, and vent termination
requirements.
Install the air inlet cover (shipped loose with the boiler) per
FIG. 4-7. Combustion and ventilation air must be supplied to
the equipment room per the requirements on pages 12 and 13
of this manual for proper operation of the Crest boiler when
utilizing the single pipe method.
Figure 4-7 Room Air Installation
AIR INLET COVER
23