mridgeelk Posted April 3, 2010 Report Share Posted April 3, 2010 Today I observed two 8x16 ducts supplying combustion air from outdoors for appliances totaling 402,000 BTUs. My question is that since these ducts run horizontally for about three feet before becoming vertical, should the 1/2000 for the horizontal or the 1/4000 for the vertical be used to calculate the proper sizing? Link to comment Share on other sites More sharing options...
Jim Katen Posted April 3, 2010 Report Share Posted April 3, 2010 Today I observed two 8x16 ducts supplying combustion air from outdoors for appliances totaling 402,000 BTUs. My question is that since these ducts run horizontally for about three feet before becoming vertical, should the 1/2000 for the horizontal or the 1/4000 for the vertical be used to calculate the proper sizing? According to the language in that code section, it should be 1/2000. However, I really can't imagine why it would matter. - Jim Katen, Oregon Link to comment Share on other sites More sharing options...
mridgeelk Posted April 5, 2010 Author Report Share Posted April 5, 2010 My concern was that it says horizontal or vertical, not in combination. I may be reading to much into it, possibly caused by having two sons and a daughter-in-law that are lawyers. They even find meaning in the spaces beween the words. Today I observed two 8x16 ducts supplying combustion air from outdoors for appliances totaling 402,000 BTUs. My question is that since these ducts run horizontally for about three feet before becoming vertical, should the 1/2000 for the horizontal or the 1/4000 for the vertical be used to calculate the proper sizing? According to the language in that code section, it should be 1/2000. However, I really can't imagine why it would matter. - Jim Katen, Oregon Link to comment Share on other sites More sharing options...
Jim Katen Posted April 5, 2010 Report Share Posted April 5, 2010 My concern was that it says horizontal or vertical, not in combination. I may be reading to much into it, possibly caused by having two sons and a daughter-in-law that are lawyers. They even find meaning in the spaces beween the words. . . But it doesn't say horizontal or vertical. It says, "Where horizontal ducts are used . . ." Since the scenario you described uses horizontal ducts, that's the part you follow. - Jim Katen, Oregon Link to comment Share on other sites More sharing options...
mridgeelk Posted April 5, 2010 Author Report Share Posted April 5, 2010 Thanks, Jim My concern was that it says horizontal or vertical, not in combination. I may be reading to much into it, possibly caused by having two sons and a daughter-in-law that are lawyers. They even find meaning in the spaces beween the words. . . But it doesn't say horizontal or vertical. It says, "Where horizontal ducts are used . . ." Since the scenario you described uses horizontal ducts, that's the part you follow. - Jim Katen, Oregon Link to comment Share on other sites More sharing options...
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