Shower Vent to Main Vent joint

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GRJack

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Please see atached pics.

I am joining the shower vent to the main vent.
Due to framing obstructions, can I join the vents like in pic. A
with the shower vent dropping (only 3-4 inches) before it tees into
the main vent (my concern is the high point of the shower vent is
higher than the tee- do sewer gases like to collect in this high area instead
of venting out?) or do I have to join them like in pic. B?

Also, for this joint can I just use a regular tee (or sani tee) or do I need
a 'vent tee'.
 

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Jadnashua

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As I understand it, the vent must essentially run up from the trap, it can't have any downward leg. Condensation or a backup could fill it and then block it.
 
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