Overview of Primary Product

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Boiler room

partially or

completely

above grade

Part Number 550-141-186/0914

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(continued)

s 4IGHTLYCONSTRUCTEDBUILDINGSMUSTBEPROVIDEDWITHOPENINGSTOOUTSIDEFORCOMBUSTION

and ventilation air. These openings must be sized to handle all fuel-burning appliances,

exhaust and ventilation fans and ﬁreplaces.

s 7HENOPENINGSTOBOILERROOMARETAKENTOINTERIORSPACESPROVIDETWOPERMANENTOPEN-

INGSACOMBUSTIONAIROPENINGWITHININCHESOFmOORANDAVENTILATIONOPENINGWITHIN

INCHESOFCEILING%ACHOPENINGMUSTPROVIDEAMINIMUMFREEAREAOFONESQUAREINCH

PER"TUHINPUTOFALLAPPLIANCESINROOMPLUSREQUIREMENTSFORANYEXHAUSTFANSIN

ROOM4HEINTERIORSPACESUPPLYINGCOMBUSTIONANDVENTILATIONAIRMUSTHAVEADEQUATE

inﬁltration from outside.

Air directly from outside to boiler room:

s 4IGHTLYCONSTRUCTEDBUILDINGSMUSTBEPROVIDEDWITH COMBUSTIONAIRAND VENTILATION

OPENINGSTOBOILERROOMWHICHAREADEQUATETOHANDLETHEBOILERNEEDSPLUSTHENEEDSOF

all other fuel-burning appliances, ﬁreplaces and exhaust or ventilation fans.

s #OMBUSTIONANDVENTILATIONOPENINGSCONNECTINGDIRECTLYORBYDUCTINGTOOUTSIDEORTO

attic or crawl spaces that freely connect with outside, must be sized as follows:

 /UTSIDEWALLORVERTICALDUCTINGONESQUAREINCHPER"TUHINPUTOFALLAPPLI-

ANCESINROOMPLUSREQUIREMENTSFORANYEXHAUSTFANSOROTHERAPPLIANCESINROOM

 (ORIZONTALDUCTINGONESQUAREINCHPER"TUHOFALLAPPLIANCESINROOMPLUS

REQUIREMENTSFORANYEXHAUSTFANSOROTHERAPPLIANCESINROOM

 !LLDUCTINGMUSTBESAMESIZEASPERMANENTOPENINGS-INIMUMAREADIMENSIONSOF

DUCTINGMUSTBENOLESSTHANSQUAREINCHES

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.