When a gas appliance is installed in a garage, the ignition source must be elevated at least how many inches above the floor?

When a gas appliance is installed in a garage, the ignition source must be elevated at least 18 inches above the floor. This requirement is in place to prevent any potential ignition of flammable vapors that may accumulate at ground level, especially since garages are typically areas where gasoline or other volatile substances might be present. Elevating the ignition source minimizes the risk of fire hazards by ensuring that any flammable gases or vapors do not come into contact with the appliance's ignition system. The standard elevation provides an effective safety measure in order to protect both the structure and its occupants from the dangers associated with gas appliances in environments where flammable materials are likely found.