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Old 03-14-2020, 07:32 PM   #1
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Tjernlund Radon Fan installation


Iím installing a Tjernlund Radon fan , trying to find out how to attach it to a hoist so thereís not much noise or vibration to feel from upstairs. Would doubling the hoist then bolting it be best? Itís right about the sump 9 feet up then the exit will be under a joist then thru the house wall. Enclosed is a picture. Thank you
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Old 03-15-2020, 07:07 AM   #2
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Re: Tjernlund Radon Fan installation


Which way is "UP"? The unit should have come with rubber isolation boots to go behind the metal to help with sound and vibration issues. If not, you can probably buy something soft to put between the wood and metal motor casing frame.
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Old 03-15-2020, 08:26 AM   #3
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Re: Tjernlund Radon Fan installation


Thank, pic is sideways - its a new type fan that exits just out the house. Ill make a box around it, so guess if muffles it. Just didn’t want to put it up and then figure out a better way then take it down again.
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Old 03-15-2020, 10:18 AM   #4
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Re: Tjernlund Radon Fan installation


The Tjernlund RadonVac fan indicates that no separate isolation joint is required - the pipe stubs have a rubber isolation joint on each entry point into the housing. So you just mount the fan to their bracket.

However, per IRC and ANSI/AARST, sidewall exiting of radon systems is not allowed, and the fan may not be installed in a conditioned space, it must be installed in the attic, garage, or exterior. Just because a product is made and sold at a big box store does not make it correct.

Passive radon systems (no fan) must exit through the roof, and there could be a very small chance your AHJ may have a variance for active (fan) radon systems discharging through the wall, so you should check with them.
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