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Member | Join Date: Dec 2008 Location: Louisa County, Virginia Posts: 12 |
Re: Radon Mitigation Vent Clearances
Hello,
The EPA Radon Mitigation Standards form #402-R-93-078 states the following;
Item# 14.2.8 To prevent re-entrainment of radon, the point of discharge from vents of fan-powered soil depressurization and block wall depressurization systems shall meet all of the following requirements: 1)be above the eave of the roof, (2) be ten feet or more above the ground level, (3) be ten feet or more from any window, door, or other opening into conditioned spaces of the structure that is less than two feet below the exhaust point, and (4) be ten feet or more from any opening into adjacent building. The total required distance (ten feet) from the point of discharge to openings in the structure may be measured either directly between the two points or be the sum of measurements made around intervening obstacles. Whenever possible, the exhaust point should be positioned above the highest eave of the building and as close to the roof ridge line as possible.
The EPA Radon Mitigation Standards form #402-R-93-078 states the following;
Item# 14.2.8 To prevent re-entrainment of radon, the point of discharge from vents of fan-powered soil depressurization and block wall depressurization systems shall meet all of the following requirements: 1)be above the eave of the roof, (2) be ten feet or more above the ground level, (3) be ten feet or more from any window, door, or other opening into conditioned spaces of the structure that is less than two feet below the exhaust point, and (4) be ten feet or more from any opening into adjacent building. The total required distance (ten feet) from the point of discharge to openings in the structure may be measured either directly between the two points or be the sum of measurements made around intervening obstacles. Whenever possible, the exhaust point should be positioned above the highest eave of the building and as close to the roof ridge line as possible.
 | Member | Join Date: Mar 2007 Location: Spring Hill (Nashville), TN Posts: 4,426 |
Re: Radon Mitigation Vent Clearances
Quote:
Originally Posted by CHARLIE VAN FLEET 
fan should be on outside of house--10 feet from any openings and should be above the roof line. or at least 10 feet off the ground---google it and go to the EPA site
charlie
charlie
Scott Patterson, ACI
Spring Hill, TN
The EPA recommends as a minimum, that plastic pipes in mitigation systems should be Schedule 20 PVC, ABS or equivalent piping materials. Schedule 40 piping or its equivalent should be used in garages and in other internal and external locations subject to weathering or physical damage. Most external installations are changed over to downspout piping after the fan as a means of blending the system in with the rest of the house. All of the joints in the plastic pipe need to be sealed using adhesives recommended by manufacturer except where the fan is connected. This typically, is a removable rubber boot with stainless steel clamps. The downspout joints are usually caulked with a urethane sealant.
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