The National Fuel Gas Code requires that if appliances are installed in residential garages or in areas where the open use, handling or dispensing of flammable liquids occurs, the appliances must be placed so that the main burner and pilot light are elevated at least 18 inches above the floor, unless the appliance is listed as flammable vapor ignition resistant. A qualified service agent can inspect this for you.
Do not use or store flammable liquids or combustible materials near your appliances. Invisible vapors from flammable liquids such as gasoline, paint, solvents and adhesives are heavier than air and can travel great distances along the floor. A pilot light or lighted burner of a natural gas appliance can ignite these vapors.
Keep all combustible materials including cloth rags and paper away from your water heater, furnace and other appliances. Store all flammable liquids in closed containers outside and away from children and appliances.