Co-Authored By:

##### Asked by: Sidibe Baldofski

home and garden home appliances# What is the smallest permissible pipe size for vents?

Last Updated: 15th May, 2020

^{1}/

_{4}inches (

**32 mm**) in diameter. Vents exceeding 40 feet (12 192 mm) in developed length shall be increased by one nominal pipe size for the entire developed length of the vent pipe.

Click to see full answer.

Herein, what is the minimum size of a vent pipe for kitchen sink?

The minimum diameter of the vent pipe is 1 1/**4 inches** in both cases.

Furthermore, how many fixture units can a 2 inch vent handle? 24 fixture units

Likewise, can you reduce the size of a vent pipe?

The line **can** be **reduce** in **size** and be kept small **if** there are enough additional **vents** to give the required aggregate area out through the roof. 2. The **pipe size** cannot be reduced but has to be full **size** from the house sewer all the way to the roof.

Can you vent a toilet with a 2 inch pipe?

The Dry **Venting Toilet** **If** the **toilet** has a 3-**inch** waste **pipe**, the **vent** must be located within 6 feet of the **toilet** trap; the distance is 10 feet for 4-**inch pipe**. Plumbers usually use **2**-**inch pipe** for this, which is larger than the plumbing code requires.