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Registered
Join Date: Jan 2002
Location: Long Beach CA, the sewer by the sea.
Posts: 38,252
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I think you nailed it, efficiency. But, the manufacturers have been cranking out efficient units for 10 years now. How old? If it uses PVC for the exhaust gases, it's new enough. They all still have relays and blower motors. There's a small SS circuit board in them, but largely serviceable in all aspects.]
Designing the ducting will have as much or more to do with what you get out of any FAU.
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