Is there any fixtures draining through the vent, such as a lavatory (bathroom sink)?
Either way, I don't know why whoever plumbed it used a side inlet 1/4 bend with two sweeps when they could have done it with a wye and 1/8 bend.
Because the picture shows a santee, I assume it is a vent and not a drain or wet vent. If that is true it is not proper because it is not rolled.
From what I can make out from the pictures, that is not a proper wet vent (here in Canada anyway).
And that looks like a 3" right inlet elbow turned upside down? That shouldn't be.
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