Answer
Jan 27, 2026 - 05:59 AM
If the CAS unit has a Hi-Lo switch next to the terminal block on the left side of the access panel, that is where the speed would be changed for the fan.
How do I lower the fan speed on my fan in a can CAS-4?
How do I lower the fan speed on my fan in a can CAS-4. It is blowing an uncontrollable amount of freezing cold sub zero air into the house. The furnace just keeps running and running and running and won’t stop because this thing is blowing such high volume of cold air that the heating system will not catch up. I need to either lower the fan speed or disable the fan. No heating system needs this amount of volume of air. And this is Massachusetts code?
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Open Jan 27, 2026 - 05:59 AM
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FAN IN A CAN CAS-34U COMBUSTION AIR SYSTEM - Field Controls
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Question: Does this unit have a fan speed control
Answer: The switch is located next to the power supply.
