Which distance requirement applies to outside air exhaust openings relative to lot lines on the same lot?

• A. 5 feet
• B. 10 feet
• C. 15 feet
• D. 20 feet

Answer: (B)

Keep outside air exhaust openings far enough from lot lines so the exhaust disperses outdoors and doesn’t re-enter neighboring properties or air intakes. The standard minimum distance on the same lot is ten feet from a lot line. This spacing helps prevent nuisance and backdraft issues and meets safety and dispersion expectations for exhaust systems. Shorter clearances increase the chance of odor, contaminants entering nearby spaces, or re-entry into the building, while larger clearances exceed the minimum and aren’t the required standard in this case.