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Soil gas contains lots of moisture
that condenses
To maximize outdoor radon fan life,
Here are two methods for install
by-pass drains |
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WPB web pages 1st - HP/GP fan Method WPB Home Page 
This radon fan has stopped working |
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If the replacement fan is a HP190, FR100 or GP series fan a new offset coupling can be tapped to install a drain plug. If you use a different radon fan - skip
down to the |
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A brass nipple is inserted into the bottom offset of the rubber coupling |
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In case water gets into the fan electrical box, a small hole is installed to allow drainage |
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New drain tubing is inserted over the brass nipple. Condensation will accumulate inside the rubber boot in the lower offset. The tubing will drain it away, before it reaches the fan. |
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The tubing needs to be insulated to prevent its freezing in the winter. |
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A drain hole below the fan is installed to allow the condensation to drain back into the suction holes. This also keeps the drain tubing under a negative pressure so that no radon laden air escapes.
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This is the finished HP190 fan replacement with the by-pass drain.
The by-pass drain will not freeze in the winter because of the airflow through the tubing and the pipe insulation. |
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The installation is complete with a system label identifying the systems purpose.
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| Dilts by-pass Drain |
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This is a Dilts by pass drain. A moon shaped piece of aluminum is caulked into the bottom of the elbow and a brass fitting is installed for the drain tube |
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It's a good idea to make sure there is still power to
the fan and that the power is off. |
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Cut a half moon piece of aluminum and then notch the edge. |
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Fold each notch in opposite directions. Dry fit the piece inside a PVC elbow |
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Drill the inside bottom of the upper portion of the
elbow above the fan with a 1/2" bit. |
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Thread a 1/4" by 3/8" thread brass fitting into the drilled hole. |
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Put a fat bead of caulk on the notched edge. |
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Place
the caulked aluminum inside the elbow just below the brass fitting |
| Run vinyl tubing with pipe insulation from the upper brass fitting |
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down to the drain hole below the fan previously drilled in the pipe |
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| New RP series Fan with a by-pass drain |
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The installation is complete with a system label identifying the systems purpose.
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If you have any questions please feel free to call Bill at 610
346-8004
Radon Fans Bench Tested |