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Installing a Big Mouth vent - question about height
I'm replacing a very old Maid-O-Mist main vent with a B&J Big Mouth. The old vent sat directly on my return pipe and this new vent will fit fine like that but I've read that it should ideally be installed about 6 (?) inches above the return pipe. Is that right? Unfortunately I have a gas pipe and floor joist right above the tap. Has anyone installed it directly into return without any problems? If not, can I put an elbow on there and divert it 4 inches to the side or will that cause any problems (like a bottleneck)?