Steven Hockstein Posted May 21, 2012 Report Share Posted May 21, 2012 This house was built in 1989 and the gas fired boiler is power vented through this piece of duct. I wrote it up as a hazard because it can be easily blocked by water or snow. Additionally, I noted that an animal can enter into the duct and block it. The boiler was serviced by a heating contractor in March, 2012 and a new duct was installed. Was this ever allowed?? Click to Enlarge 62.18 KB Quote Link to comment Share on other sites More sharing options...
kurt Posted May 21, 2012 Report Share Posted May 21, 2012 Nope. There's direct vent boilers, but the vent discharge has to be above possible snow drift height; there's no specific height stipulated. It certainly can't be discharged below grade. Quote Link to comment Share on other sites More sharing options...
Jerry Simon Posted May 21, 2012 Report Share Posted May 21, 2012 there's no specific height stipulated. Most say 12" above any anticipated snow level. . . Truly non-specific. Quote Link to comment Share on other sites More sharing options...
Tom Corrigan Posted May 21, 2012 Report Share Posted May 21, 2012 Actually it's very specific thanks to your government. NOAA can provide the historical max depth of snow accumulation for most areas. The 12" of clearance is above this depth. Tom Corrigan Quote Link to comment Share on other sites More sharing options...
Jerry Simon Posted May 21, 2012 Report Share Posted May 21, 2012 Actually it's very specific thanks to your government. NOAA can provide the historical max depth of snow accumulation for most areas. The 12" of clearance is above this depth. Tom Corrigan I kinda disagree. As Kurt mentioned, snow drifts. Snowfall depth records don't account for drift heights. Quote Link to comment Share on other sites More sharing options...
Bain Posted May 22, 2012 Report Share Posted May 22, 2012 Our local gas utility uses the 12" rule. Anything less, the furnace gets red-tagged. Quote Link to comment Share on other sites More sharing options...
kurt Posted May 22, 2012 Report Share Posted May 22, 2012 Actually it's very specific thanks to your government. NOAA can provide the historical max depth of snow accumulation for most areas. The 12" of clearance is above this depth. Tom Corrigan I kinda disagree. As Kurt mentioned, snow drifts. Snowfall depth records don't account for drift heights. Yep, read it. No height, and drifting is noted as a reason. Quote Link to comment Share on other sites More sharing options...
Darren Posted May 22, 2012 Report Share Posted May 22, 2012 Here in the lovely Garden State, the anticipated snow level is 6 inches; so the vent termination must be 18 inches above the ground or roof. Download Attachment: snowlevel nj.pdf 41.85 KB Quote Link to comment Share on other sites More sharing options...
asihi Posted May 23, 2012 Report Share Posted May 23, 2012 You didn't mention who the manufacturer is, but this is Weil-Mclane's direct-vent requirements. I would assume they are all pretty much the same. Download Attachment: Weil-McLane direct vent.pdf 292.21 KB Quote Link to comment Share on other sites More sharing options...
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