Starting a vent with a 45 degree angle

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roundrightfarm

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Greetings,
I am putting in a master bath and am looking for my best venting options.

I have read that all vents must go vertically until they get 6" above the flood rim of the fixture they are venting.
I have also read that, as far as codes are concerned, 45 degree drops can be considered as vertical. I am hoping this applies to vents below the flood rim as well.

I'd like to vent off my 2" shower drain using a 2" combo wve set at a 45 degree angle. This will take me over a few inches, to where I am below the wall, where I will use a 2" 45 elbow to take me straight up through the wall.

Any problems with doing it this way? I've included a birds eye view drawing of the bathroom DWV system. Any thoughts on better or different ways to do this would be appreciated.
masterbath.jpg
 

Cacher_Chick

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No less than 45 is fine. Your WC is vented through the lav drain, so having a separate vent on it is redundant.
 
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