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Consumer: Retain this manual for future refer- ence. GRAVITY VENTED SINGLE WALL FURNACE MODEL GWT-25-2(SG, RB) GWT-35-2(SG, RB) WARNING: If the information in these instructions are not followed exactly, a fire or explosion may result causing property damage, personal injury or loss of life. — Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance. — WHAT TO DO IF YOU SMELL GAS • Do not try to light any appliance. • Do not touch any elec