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Boiler room
partially or
completely
above grade
Part Number 550-141-186/0914
5
s)NSTALLATIONs3TART5Ps-AINTENANCEs0ARTS
!
)
(continued)
s 4IGHTLYCONSTRUCTEDBUILDINGSMUSTBEPROVIDEDWITHOPENINGSTOOUTSIDEFORCOMBUSTION
and ventilation air. These openings must be sized to handle all fuel-burning appliances,
exhaust and ventilation fans and fireplaces.
s 7HENOPENINGSTOBOILERROOMARETAKENTOINTERIORSPACESPROVIDETWOPERMANENTOPEN-
INGSACOMBUSTIONAIROPENINGWITHININCHESOFmOORANDAVENTILATIONOPENINGWITHIN
INCHESOFCEILING%ACHOPENINGMUSTPROVIDEAMINIMUMFREEAREAOFONESQUAREINCH
PER"TUHINPUTOFALLAPPLIANCESINROOMPLUSREQUIREMENTSFORANYEXHAUSTFANSIN
ROOM4HEINTERIORSPACESUPPLYINGCOMBUSTIONANDVENTILATIONAIRMUSTHAVEADEQUATE
infiltration from outside.
Air directly from outside to boiler room:
s 4IGHTLYCONSTRUCTEDBUILDINGSMUSTBEPROVIDEDWITH COMBUSTIONAIRAND VENTILATION
OPENINGSTOBOILERROOMWHICHAREADEQUATETOHANDLETHEBOILERNEEDSPLUSTHENEEDSOF
all other fuel-burning appliances, fireplaces and exhaust or ventilation fans.
s #OMBUSTIONANDVENTILATIONOPENINGSCONNECTINGDIRECTLYORBYDUCTINGTOOUTSIDEORTO
attic or crawl spaces that freely connect with outside, must be sized as follows:
/UTSIDEWALLORVERTICALDUCTINGONESQUAREINCHPER"TUHINPUTOFALLAPPLI-
ANCESINROOMPLUSREQUIREMENTSFORANYEXHAUSTFANSOROTHERAPPLIANCESINROOM
(ORIZONTALDUCTINGONESQUAREINCHPER"TUHOFALLAPPLIANCESINROOMPLUS
REQUIREMENTSFORANYEXHAUSTFANSOROTHERAPPLIANCESINROOM
!LLDUCTINGMUSTBESAMESIZEASPERMANENTOPENINGS-INIMUMAREADIMENSIONSOF
DUCTINGMUSTBENOLESSTHANSQUAREINCHES
4. Other size ducting must comply with local codes.
Compensate for louver blockage when calculating combustion air and ventilation openings.
See
Figures 1 and 2. Refer to manufacturer’s instructions for sizing.
Adjustable louvers must be locked open and combustion air damper must interlock with boiler
controls to open automatically before boiler operation.
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