All woodwork or lath and plaster within two feet of a boiler, furnace, stove or smokepipe or of a gas or oil lamp shall be protected by a lining of asbestos board one-quarter inch thick and of sheet metal with one-half inch space between. All woodwork within two inches of any hot-air pipe and overhead ceilings of boiler and furnace rooms shall be protected in like manner with two thicknesses of asbestos paper and one thickness of sheet metal or by metal lath and plaster.