Mike Lamb 65 Posted March 29, 2017 Report Share Posted March 29, 2017 Shouldn't the exterior downspout connection for the radon mitigation be sleeved into the upper connection since air/gases are being pushed upward? It seems common sense but I don't know. This may have been done for water that might run down? Click to Enlarge 29.19 KB Click to Enlarge 62.95 KB Quote Link to post Share on other sites
Jim Katen 153 Posted March 29, 2017 Report Share Posted March 29, 2017 It's about pressure. The direction of the air flow doesn't make it leak more in one direction than another. When the pressure inside the pipe is greater than the pressure outside, air will leak out, regardless of the orientation of the sleeves. Quote Link to post Share on other sites
Les 80 Posted March 29, 2017 Report Share Posted March 29, 2017 Mike, I don't really know either. that setup seems a tad on the "poor workmanship" side of the spectrum 'tho. it is close to the window, leaky conduit, seems the fan is too large for the capacity of gutter downspout, etc. Quote Link to post Share on other sites
Les 80 Posted March 29, 2017 Report Share Posted March 29, 2017 It's about pressure. The direction of the air flow doesn't make it leak more in one direction than another. When the pressure inside the pipe is greater than the pressure outside, air will leak out, regardless of the orientation of the sleeves. I partially agree. Velocity is the variable. if the air is moving across an orifice (opening) then it could create a vacuum. Quote Link to post Share on other sites
Charlie R 4 Posted March 29, 2017 Report Share Posted March 29, 2017 Nothing wrong there, but using a downspout is regarded by many radon mitigators to be "cheap." Quote Link to post Share on other sites
Marc 88 Posted March 29, 2017 Report Share Posted March 29, 2017 The venturi effect occurs at a constriction in the flow of a fluid. The downspout has no constriction. Maybe there's some other effect being referred to here. Marc Quote Link to post Share on other sites
Rob Amaral 7 Posted March 31, 2017 Report Share Posted March 31, 2017 That would not pass mustah around here (MA)... all our mitigators use PVC Quote Link to post Share on other sites
Steven Hockstein 9 Posted March 31, 2017 Report Share Posted March 31, 2017 That would not pass mustah around here (MA)... all our mitigators use PVC same here. I have never seen a system using the leader pipes for the radon system. Quote Link to post Share on other sites
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