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Considering this, are wet vents allowed?

1 Vertical Wet Vent Permitted. Any combination of fixtures within two bathroom groups located on the same floor level is permitted to be vented by a vertical wet vent. The dry-vent connection to the vertical wet vent shall be an individual or common vent serving one or two fixtures.

Beside above, do you have to vent a shower? Everyone knows that every toilet, bathtub, sink, shower, etc. will have a drain to carry the water away to sewage treatment, or your septic. Whether you're putting in a tub, toilet, sink, or floor drain, they all need a plumbing vent on the drain to make it work properly.

Similarly one may ask, can a wet vent run horizontal?

Wet Vent to Main Drain Plumbing codes are very specific about the angle at which a wet or dry vent may enter a horizontal drain line. Because it carries water and air, a wet vent must connect at an angle less than 45 degrees to this line.

Do vent stacks need to be vertical?

Installing Vent Pipes Vent pipes must be installed so they stay dry. This means that they should emerge from the top of the drainpipe, either straight vertically or at no less than a 45-degree angle from horizontal, so that water cannot back up into them.