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# cfm of oil burner?

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Posts: 233
Is there an easy way to calculate the air flow in CFM of an oil burner mathematically?  Or a general 'rule of thumb'?

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I understand that you could find the number of molecules in a gallon of heating oil multiplied by the nozzle size in GPM and the number of molecules of oxygen in a cubic foot of air times the stoiciometric air fuel ratio and all that jazz.........but is there a heating guy handbook easy method?

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• Member Posts: 3,542
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1600 CFM/Gallon

To that you have to add excess air,usually 25-50% depending on age/quality of burner. So,about 2000-2400 CFM/ gallon. Makes sealed combustion look pretty good?
• Posts: 233
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thanks Bob!

Sealed combustion looks real good from that angle.   Now its understandable why my 3000cu ft basement constantly sucks air from every crack in the wall.

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I was looking at burner intake air boots for outside air intake.  Field's has one with a 4" duct requirement.  At 1500 CFM thru a 4" duct, the air will be flowing at 286 feet per second!  It seems like that will turn into a jet engine and take off into outer space, sucking in anything that walks by the side of the house.  I can't see the fan motor lasting too long with an air boot of 4" diameter.  Can anybody recommend these things?  Seems like a loud design.

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• Member Posts: 2,997
edited October 2011
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Beckett

The Beckett air boots are 4" with a vacuum relief installed. I have installed many of them with 4"  and it solves so many problems. They do have a maximum length of run with elbows and If your cant get to the outside in this distance I would look at the fan in a can to help solve your issues..

Duct length distance, a maximum of

30 linear feet of standard duct pipe

and two (2) 90o elbows. Subtract

7' from the maximum linear feet for