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Old 12-09-2012, 07:39 PM
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Default furnace fresh air intake

the intake on my furnace just dripped on me.
1963 house and ducting
2000ish mid efficiency furnace
the ducting is wrapped with some insulation with silver coating and it is dripping out through little spots into my unfinished basement. closer to the outside there is a big frozen drip as well.


I am guessing if I wanted things right the intake should be airtight and not dripping on me? or could this just be a sign of higher humidity from the tank condensing on the intake line when its sucking cold air in?
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Old 12-09-2012, 07:58 PM
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How close is the intake from dryer vent. Really the moisture is from cold air frosting pipe
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Old 12-09-2012, 08:07 PM
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dryer vent is 20 feet away. that insulation layer on the pipe is pretty old and beat up, the ice dripping part is a couple inch gash in the silver lining. If the basement was finished I might be more worried but after initial panic mode right its working its way down to one of those little things to fix if i upgrade the heating+add an HRV kind of thing.
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Old 12-09-2012, 08:18 PM
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Yeah, it's the warm moist air from your house condensating on the pipe. A temporary trick/fix is loosely wrap saran wrap around the old insulation. This will do 2 things. Help give the old insulation wrap 100% support around the pipe and give an air seal (trap the air) in the old insulation, kind of how you put the cellophane stuff on your windows in the winter.
The down side is it will trap the existing moisture in there. They sell insulation sleeves at HomeDepot that is designed to slip over the pipe, but you wold have to take the pipe apart somewhere to slip it over.
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Old 12-10-2012, 07:13 AM
scubadawg scubadawg is offline
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Look at getting a hoyme damper setup for your intake and makeup


http://youtu.be/iQIQIA2M8tQ

Last edited by scubadawg; 12-10-2012 at 07:19 AM.
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