RGF Guardian Air PHI-118-GA-VSF Air Purification System REPLACEMENT bulb This is a 5" REPLACEMENT bulb for the RGF Guardian Air PHI-118-GA-VSF (300 to 1,200 CFM.) This product is recommended for any duct air conditioning system. It is good against mold, odors, VOC's, bacteria or viruses. Applications: Family homes, apartments, town houses, basements, shops, offices, restaurants, locker rooms. Two (2) years warranty.