Section
A: BeforeInstalling
Boiler
Installations must comPlY with:
o State. pro','incial and local plumbing, heating and
electrical codes.
o Regulations of senring utilities.
o National codes where applicable.
Before selecting boiler location:
o Check for nearby connections to:
fuel sr-rpply
electrical power
system water or steam PiPing
- r,'entinAsystems - see page 24.
combustion and ventilation air supply - see "Providc
combustion and ventilation air supply openings"
below.
o Check area around boiler for and remove any combus-
tible materials, gasoline and other flammable vapors
ancl liouids. Failure to keep boilcr area clear and
free of combustible materials, Aaso-
line and other flammable liquids and
vapors can rcsult in severc personal
injury, death and substantial proper-
ty damagc.
Providecombustion and ventilation air openings:
Do not install arn
exhaust lan in boiler
room. Adequatc combustion and ventila-
tion air must be provided to assure propcr
combustion and prevent possibility of flue
gas lezrkageand carbon monoxide emis-
sions, causing severe personal injury or
death.
Opening sizes must comply with state, provincial or local
codes. In their absence. use the following when boiler is in
a confined room:
o Provide two penniar-rentopenings in boiler room - one
within 12 inches of ceiling. one ','v'ithinl2 inches of
floor. Minimum dimension of each opening - 3 inches.
- When all air is taken from rvithin building, each
opening should be at least one square inch/
1'ooo Btuh boiler input and freell' connect with
areas having adequate infiitration from outside.
- When all air is taken from outdoors. each opening
should connect directly or by ducts with outdoors
or crawl or attic spaces that lreely connect with
outdoors ancl sized as listed below:
through outside wall or vertical ducts - at least
one square inch/4,000 Btuh boiler input.
- through horizontal ducts - a least one square
inch/2,000 Btuh boiler inPut.
- where ducts are used, they should be same
cross-sectional area as lree area of openings
they are connect.ed to.
- Compcnsate lbr louver, grille or screcn block-
agewhcn calculating liee air openings. Refer to
thcir mzrnufacturer's instntctions lbr size
. If
ttnkrtowlr, ttse:
- wood louvcrs - 2o-25oh free air.
- metal louvers or grilles - 60-750/o
lree air.
- screens - not less than l/4 inch mesh.
l,ock louvers in open position, or interlockwith
equipment to prove open belbre boiler opera-
tion.
LOUVER
MIN,I2"
ABOVEAVG.
SNOWLINE
NOTE:
DUCT
SIZE
EQUAT
TO
TOTAL
LOUVER
AREA
BOILER
ROOI'1
FTOOR
Combustion and Ventilation Air Openings
Boiler Room Partially or Completely Above Grade
Figure 2
o
GRATING
_
MIN,I2'ABOVE
AVG,
SNOWLINE
SIZEOF
AREAWAY
ANDGRATING
TO
BEEQUAL
TOOR
GREATER
THAN
TOTALTOUVER
AREA.
AREAWAY
Combustion and Ventilation Air Openings
Boiler Room Below Grade
Figure I
4
t/
