Horizontal Thru-Wall Venting / Inside Combustion Air; Installation - CleaverBrooks CFC-500 Operation, Service And Parts Manual

Venting Installation Tips
Support piping:
• Horizontal runs- at least every five (5) feet.
• Vertical runs - use braces.
• Under or near elbows
Follow items listed below to avoid personal injury or property
damage.
• Cut nonmetallic vent pipe with fine-toothed hacksaw (34 teeth per
inch).
• Do not use nonmetallic vent pipe or fittings that are cracked or
damaged.
• Do not use nonmetallic vent fittings if they are cut or altered.
• Do not drill holes, or use screws or rivets, in nonmetallic vent pipe
or fittings.
B. HORIZONTAL THRU-WALL VENTING / INSIDE
COMBUSTION AIR

1. Installation

For boilers connected to gas vents or chimneys, vent installations
shall be in accordance with Part 7, Venting of Equipment, of the
latest edition of National Fuel Gas Code, or in Canada, the latest
edition of CAN/CSA-B 149.1 and.2 Installation Code for Gas
Burning Appliances and Equipment, or applicable provisions of
local building codes.
These installations utilize the boiler-mounted blower to vent the
combustion products to the outside. Combustion air is taken from
inside the room and the vent is installed horizontally through the
wall to the outside. Adequate combustion and ventilation air must
be supplied to the boiler room in accordance with the National Fuel
Gas Code or, in Canada, the latest edition of CAN/CSA-B 149.1 and
.2 Installation Code for Gas Burning Appliances and Equipment.
The direct vent cap is not considered in the overall length of the
venting system.
The vent must be installed to prevent flue gas leakage. Care must
be taken during assembly to insure that all joints are sealed properly
and are airtight.
The vent must be installed to prevent the potential accumulation of
condensate in the vent pipes. It is recommended that:
• The vent be installed with a slight downward slope of not more
than 1/4" per foot of horizontal run to the vent terminal.
• The vent be insulated through the length of the horizontal run.
For appliances installed in extreme cold climate, it is recommended
that:
Part No. 750-263
Caution
!
Section 3 — Stack and Intake Vent Sizing and Installation
Flue Gas Vent
(w/Screen)
Figure 3-1 Horizontal Venting
Thru-Wall Using Inside Air For
Inside Air
Combustion
Intake
24" Minimum
Combustion
3-5