Moving a sink vent

I have to move a 1 1/2 vent pipe about two feet to allow room for a new window. The pipe vents three sinks. Is there anything wrong with using four 90 degree ells to run it to the right, up, to the left and finally rejoin the existing pipe to the roof?
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should be fine.
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Paul A wrote:

Note that the pipe will slope *upwards*, toward the roof. That's built into the fitting, so you shouldn't have a problem.
Jim
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