Humidifier Install - Aprilaire 600 (okay to reduce 6" bypass to 4"?)


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Old 02-16-18, 06:49 PM
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Humidifier Install - Aprilaire 600 (okay to reduce 6" bypass to 4"?)

I'm replacing an old Honeywell TrueSteam with a new Aprilaire 600. The Honeywell has a 1" bypass duct that connects to the furnace's supply plenum, directly above my furnace (upflow). The Aprilaire calls for a 6" bypass duct. Unfortunately, the supply plenum above my furnace is too small for a 6" circular cut. I could fit a 4" hole, which would require a 6" to 4" reducer. Would this significantly reduce the efficiency of the humidifier? Is there a chance of this setup damaging my new humidifier or A/C system? Alternatively, a rectangular duct would fit. Would a 6" to 10" x 3.25" duct be a better option?

Thanks in advance for any recommendations or guidance.
 
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Old 02-16-18, 07:04 PM
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Would a 6" to 10" x 3.25" duct be a better option?
Yes. Much less of a reduction than a 4" connection.

A 4" connection would work. It wouldn't damage anything but from the reduced air flow..... you'd have less moisture transferred to the air and more wasted water coming out of the drain.
 
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Old 02-20-18, 04:35 PM
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Went with the 10 x 6 rectangular ducting. Still working on the install, but got this duct installed and it looks pretty clean. Thanks to PJMax for the recommendation!
 
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Old 02-20-18, 08:00 PM
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You're welcome.
Looking forward to hearing about the completed job and lots of humidity in the house.
 
 

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