A heater installed in a public garage must be installed a minimum distance above the floor of how many feet?

A heater installed in a public garage must be installed a minimum distance above the floor of how many feet?

• A. 6 feet
• B. 8 feet
• C. 10 feet
• D. 12 feet

Answer: (B)

Public garages face a higher risk from flammable vapors pooling near the floor. Gasoline and other fuels can evaporate and create a vapor layer that may ignite if it reaches an ignition source. Placing the heater high above the floor keeps the burner out of that vapor zone, reducing the chance of a flash fire. Eight feet is the common minimum height chosen because it places the ignition source well above the typical vapor layer while keeping installation practical. Installing lower would increase ignition risk, while going much higher adds cost without substantially increasing safety.

Public garages face a higher risk from flammable vapors pooling near the floor. Gasoline and other fuels can evaporate and create a vapor layer that may ignite if it reaches an ignition source. Placing the heater high above the floor keeps the burner out of that vapor zone, reducing the chance of a flash fire. Eight feet is the common minimum height chosen because it places the ignition source well above the typical vapor layer while keeping installation practical. Installing lower would increase ignition risk, while going much higher adds cost without substantially increasing safety.