What height must a gas unit heater be above the floor in a residential garage?

What height must a gas unit heater be above the floor in a residential garage?

• A. Five feet
• B. Six feet
• C. Seven feet
• D. Eight feet

Answer: (C)

The height is driven by ignition safety in garages. Gas-fired unit heaters must be mounted so the bottom of the unit is not less than seven feet above the floor. This keeps the ignition source above where flammable vapors—like gasoline vapors that tend to linger near the floor—are most likely to be present, reducing the chance of ignition. Five or six feet would be below the required minimum, while eight feet would still meet the rule but is not the minimum height specified. Therefore, seven feet is the correct minimum height to satisfy the code.

The height is driven by ignition safety in garages. Gas-fired unit heaters must be mounted so the bottom of the unit is not less than seven feet above the floor. This keeps the ignition source above where flammable vapors—like gasoline vapors that tend to linger near the floor—are most likely to be present, reducing the chance of ignition. Five or six feet would be below the required minimum, while eight feet would still meet the rule but is not the minimum height specified. Therefore, seven feet is the correct minimum height to satisfy the code.