What is the required height above the floor for a gas unit heater installed in a commercial garage?

What is the required height above the floor for a gas unit heater installed in a commercial garage?

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

Answer: (B)

In a commercial garage, the ignition source of a gas-fired unit heater must be kept well above the level where flammable vapors tend to gather near the floor. Installing the heater with the burner and ignition components at eight feet above the floor places the flame risk zone above most vapors and vehicle-related spills, reducing the chance of ignition and improving safety in a space where gasoline and solvents are present. Eight feet balances practical installation with the safety requirement, whereas lower heights would bring the burner closer to potential spills and higher heights would be unnecessarily difficult to install and heat distribution would be less efficient.

In a commercial garage, the ignition source of a gas-fired unit heater must be kept well above the level where flammable vapors tend to gather near the floor. Installing the heater with the burner and ignition components at eight feet above the floor places the flame risk zone above most vapors and vehicle-related spills, reducing the chance of ignition and improving safety in a space where gasoline and solvents are present. Eight feet balances practical installation with the safety requirement, whereas lower heights would bring the burner closer to potential spills and higher heights would be unnecessarily difficult to install and heat distribution would be less efficient.