Form: 2435
Revision: 9
Free Flex Installation and Operation Manual
Date: 9-1-2017
Bryan Steam LLC, 783 N Chili Ave, Peru IN 46970
Web:
www.
bryanboilers
.com
Phone:
765-473-6651
Fax:
765-473-3074
Email:
15
Positive means for supplying an ample
amount of outside air, allowing for the
complete combustion of the gas, must be
provided.
Movable combustion air dampers, automatic
or manually adjustable, must be electrically
interlocked with the boiler to prevent boiler
operation if the dampers are closed.
Combustion air openings must never be
blocked or obstructed in any manner.
The boiler room must be at a positive or
neutral pressure relative to the outdoors. A
negative in the boiler room will result in
downdraft problems and incomplete
combustion due to the lack of air.
WARNING!
Failure to provide an adequate air supply
will result in boiler damage and hazardous
conditions in the building (fire and
asphyxiation hazard as well as equipment
damage).
3.3.1
Combustion Air Openings:
The design of combustion air openings
MUST comply with local and/or State codes
or the authority having jurisdiction. As a
minimum, combustion air openings to the
boiler room shall be provided as follows:
NOTICE
Combustion air provided solely from an
indoor source is discouraged. No
dimension for a round or rectangular
opening shall be less than 3”.
3.3.1.1
Two Permanent Opening Method
One opening starting within 12” of the top of
the boiler room and one starting within 12” of
the bottom of the boiler room shall be
provided. The openings shall be open directly
to the outside or ducted directly to the
outside.
When directly open to the outside or ducted
to the outside by
vertical
ducts, each opening
or duct shall have a minimum fee open area
of 1 in
2
per 4000 BTU total input rating of the
boiler(s) in the room.
If ducted to the outside through
horizontal
ducts, each opening or duct shall have a
minimum free area of 1 in
2
per 2000 BTU
total input rating of the boiler(s) in the room.
3.3.1.2
One Permanent Opening Method
One opening commencing within 12” of the
top of the room shall be provided. The
opening shall be directly to the outside or
shall be ducted to the outside with a
horizontal or vertical duct.
The opening or duct shall have a minimum
free area of:
1 in
2
/ 3000 BTU /hour of the total input
ratting of all appliances (boilers) in the room.
Additional area must be provided for other air
consuming equipment in the room.
3.3.1.3
Mechanical Air Supply Systems
The combustion air supply may be provided
by a mechanical air supply system. If utilized,
the combustion air must be provided from
the outside at a minimum rate of 0.35 ft
3
/min.
for every 1000 Btu/hr. input for all appliances
located in the space.
