hoosier inspector Posted May 19, 2013 Report Share Posted May 19, 2013 This install reduces the vent diameter and I was going to write it up. But then I wondered why would someone extend the vent? The install manual only addresses the intake clearance. Would the proximity of the old chimney have an effect? Did an installer misread the instructions for clearance? Thanks for any help. Click to Enlarge 58.34 KB Quote Link to comment Share on other sites More sharing options...
Mark P Posted May 19, 2013 Report Share Posted May 19, 2013 No I don't see how it cold be right. It has to extend at least 12 above the roof line or past the expected snow load, so maybe they get a lot of snow and that is why it was extended. If you have the make and model of the furnace you could look it up. Below I have cut and pasted two sections from the instrustions to a Nordyne Concentric Vent Termination Kit for Condensing Furnaces http://www.nordyne.com/Literature/7083660.pdf NOTE: If assembly needs to be extended, the 2 pipes supplied in the kit may be replaced by using the same diameter, field supplied SDR-26 PVC (D2241) pipe. Do not expand dimension "D" more than 60 inches "Do not operate the furnace with rain cap removed. Recirculation of combustion products may occur, or water may accumulate inside larger combustion air pipe and flow into the burner enclosure. Failure to follow this warning could result in product damage or improper operation, personal injury or death." Quote Link to comment Share on other sites More sharing options...
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