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Old 02-04-2009, 01:25 PM   #1
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Installing humidifier


I just installed a AirKing (wait5000) humidifier on my furnace and it seems to be working well. My father purchased the same one but with a thermostat built into it since he doesnt have the wiring that goes to the main floor.

Problem is in the isntallation manual it shows that the round hole should be the same height as the warm air duct main unit hole. On my install there was an old drum style that i removed and the round cut-out hole was already about 3 inchs higher then the main unit and there seems to be no problems.

My dads furnace is a little more compact and his side return duct is 8 inchs and the airking (and most humi) takes 10 inchs. I was thinking of installing the main unit on the front or rear of the return duct instead, but this would make the 6 inch flex pipe have to have 2 bends and the unit wouldnt be the same height of the round opening to the plenium.

So what im really asking here, why do they have to be the same height? and is having one or two bends really that bad? (maybe use solid duct instead of flex)

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Old 02-04-2009, 02:36 PM   #2
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Installing humidifier


They do not have to be the same as long as they attach to both ducts. Hum. mounted to return bypass piped to supply. An extra elbow or two won't hurt either.
You may also need to install a damper it the bypass if you have a/c.

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Last edited by SKIP4661; 02-04-2009 at 02:37 PM. Reason: add
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Old 02-04-2009, 02:48 PM   #3
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Installing humidifier


Thanks for the quick reply. Myself i dont have an AC but my father does have one. What is a damper and how do I know if he will need one?

Is that the little round metal peice that you push in to block the round cut-out hole in the plenum?

Last edited by simonb; 02-04-2009 at 02:51 PM.
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Old 02-05-2009, 12:16 PM   #4
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Installing humidifier


Quote:
Originally Posted by simonb View Post
Thanks for the quick reply. Myself i dont have an AC but my father does have one. What is a damper and how do I know if he will need one?

Is that the little round metal peice that you push in to block the round cut-out hole in the plenum?
Yes. The damper is used to stop the airflow going through the humidifier during the summer months when the AC is on.
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