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Installation & Operation Manual
Air intake/vent connections
1. Combustion Air Intake Connector (FIG. 2-1) - Used to
provide combustion air directly to the unit from outdoors.
A fitting is provided with the unit for final connection.
Combustion air piping must be supported per guidelines
listed in the National Mechanical Code, Section 305, Table
305.4 or as local codes dictate.
2. Vent Connector (FIG. 2-1) - Used to provide a
passageway for conveying combustion gases to the
outside. A transition fitting is provided on the unit for
final connection. Vent piping must be supported per the
National Building Code, Section 305, Table 305.4 or as
local codes dictate.
IMG01034
ROOM AIR BOX
SHIPPED WITH
UNIT
AIR PIPE
(FIELD SUPPLIED)
VENT PIPE
(FIELD SUPPLIED)
CONNECTOR SIZED FOR STAINLESS STEEL
FLUE PIPE
Figure 2-1 Combustion Air Adapter
Vent and air piping
The Crest is certified as a Category II/IV boiler. This product
has been approved for use with stainless steel vent systems.
All venting systems used with a Crest boiler must be suitable
for Category IV operation except for factory approved
common vent systems operating as allowed in the Common
Venting Section on page 19.
ƽ WARNING
NOTICE
NOTICE
When a sidewall or vertical rooftop combustion air supply
system is disconnected for any reason, the air inlet pipe
must be resealed to ensure that combustion air will be free of
contaminants and supplied in proper volume.
ƽ DANGER
Failure to properly seal all joints and seams
as required in the air inlet piping may
result in flue gas recirculation, spillage
of flue products and carbon monoxide
emissions causing severe personal injury
or death.
The Crest uses model specific combustion air intake and vent
piping sizes as detailed in Tables 2B and 2C on page 17.
Increasing or decreasing combustion air
or vent piping to sizes not specified in this
manual is not authorized.
NOTICE
2 General venting
Use only the materials, vent systems,
and terminations listed in Table 2A-1.
DO NOT mix vent systems of different
types or manufacturers, unless listed in
this manual. Failure to comply could
result in severe personal injury, death, or
substantial property damage.
Installations must comply with applicable
national, state, and local codes. Stainless
steel vent systems must be listed as a
UL-1738 approved system for the United
States and a ULC-S636 approved system
for Canada.
Installation of a stainless steel vent system
should adhere to the stainless steel vent
manufacturer’s installation instructions
supplied with the vent system.
NOTICE
The Crest is supplied with an integral
FasNSeal vent connector (FIG. 2-1). The
installer must use a specific vent starter
adapter supplied by the vent manufacturer
to adapt to different vent systems.
Table 2A-1 Approved Stainless Steel Vent Manufacturers
Approved Stainless Steel Vent Manufacturers
Make Model
ProTech Systems (Dura-Vent Co.) FasNSeal Vent
Z-Flex (Nova Flex Group) Z-Vent
Heat Fab (Selkirk Corporation) Saf-T Vent
Metal Fab Corr/Guard
Securities Chimneys International Secure Seal SS
Schebler Chimney Systems eVent
ICC VIC
Jeremias --