Floor Drain minimum trap size is specified as?

Floor Drain minimum trap size is specified as?

• A. 1-1/2 inches
• B. 2 inches
• C. 2-1/2 inches
• D. 3 inches

Answer: (B)

The most basic reason is that floor drains need enough internal cross-sectional area to handle variable and sometimes heavy discharge without losing the trap seal. A floor drain can release a lot of water at once, so the trap must be large enough to carry that flow and resist being siphoned or blocked. For standard floor drains, codes establish two inches as the minimum trap size. Smaller traps would be more prone to clogging and trap-seal loss, while larger sizes like two-and-a-half or three inches are reserved for special, heavier-duty installations. So, the minimum trap size specified for a floor drain is two inches.

The most basic reason is that floor drains need enough internal cross-sectional area to handle variable and sometimes heavy discharge without losing the trap seal. A floor drain can release a lot of water at once, so the trap must be large enough to carry that flow and resist being siphoned or blocked. For standard floor drains, codes establish two inches as the minimum trap size. Smaller traps would be more prone to clogging and trap-seal loss, while larger sizes like two-and-a-half or three inches are reserved for special, heavier-duty installations. So, the minimum trap size specified for a floor drain is two inches.