When you are looking for a work horse of a furnace filter, this is the right choice for you. This standard grade filter has a tough metal media retainer, which is adhered to the frame on the exit side of your furnace for extra filter strength. The filtering medium of continuous strand spun fibreglass offers maximum airflow to alleviate strain on your furnace equipment, resulting in lower operating costs. Each new filter installation delivers 30 to 90 days of reliable performance. You will soon be enjoying trouble-free air conditioning and central heating when you replace your filter regularly with this Duststop furnace filter.