On an exterior wall, how many propane tanks are allowed?

• A. 2
• B. 4
• C. 6
• D. 8

Answer: (B)

Propane storage on an exterior wall is limited to control fire risk and gas volume in a single location. In typical residential practice, up to four propane tanks are allowed. This keeps the amount of flammable gas manageable and ensures there’s enough space for ventilation and emergency access, reducing the potential impact of a leak or fire on the building exterior. Cylinders should be upright, secured, protected from the weather, and kept away from openings and ignition sources, with proper clearances.

Two would be too small for practical exterior service needs, while six or eight would exceed common safety allowances and the intended limit in standard codes and practice. If more storage is needed, it should be placed in a dedicated outdoor area with appropriate ventilation and distance requirements per local codes.