If the question is whether it is a code approved fitting for that application the answer is no. Santee’s cannot be used horizontally, only vertically. The only way I’ve seen them approved horizontally is on a vent, and even then its rare and frowned upon.
I just rarely see it in my area and its usually in situations where there is no other option, so it seems to be a less than ideal method. As far as I know there is nothing in my code prohibiting their use in venting systems, but that doesn’t mean inspectors always agree with itWhy would they frown on a san tee on its side in a vent ? I ask because thats what is used here to revent a lot in the attic.
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