Answer
Feb 24, 2026 - 11:21 AM
If each oil-fired appliance is rated at 200 MBH, we recommend installing a dedicated CAS-34U for each unit to provide proper combustion and makeup air.
How many CAS-34U will I need for 3 staged oil boilers, firing at about 200kbtu each?
We will use a 10" round intake duct to bring outside air to the Boiler area of a very large basement. The boilers are NOT in a confined space. We are trying to equalize air pressure in the Basement to increase draft up the chimney. Client is complaining of oil smell in room above boilers. This room has a fireplace with separate flue in common chimney with boiler flue.
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Open Feb 24, 2026 - 11:21 AM
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FAN IN A CAN CAS-34U COMBUSTION AIR SYSTEM - Field Controls
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