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Aprilaire / Space-Gard #501 High Efficiency Filtering Media - 4-Pack Special We normally price 2-packs of the 501 filter at $59.00 each. Purchase this 4-Pack and save 12%! These are the original, OEM expandable "accordian" style, factory recommended replacement filters for the Aprilaire/Space-Gard Model 5000 Air Cleaner. MERV 10 rated. The filters ship like a collapsed accordian and are expanded into a plastic frame within the air cleaner cabinet. The filter is snapped into the plastic frame and held in place with existing pleat spacers. Assembly instructions are printed on the product carton. The air cleaner media in the Model 5000 can last from 6 months up to 2 years. If installed on a 5-ton system, in the presence of high concentration of particulate, or if the furnace fan is on continuously, it may be necessary to change the media more frequently. In any application, the life of the media is dependant upon the total volume of air being moved through it as well as the amount of particulate it is filtering. Filters are expanded into existing plastic frame and held in place with existing pleat spacers CLICK HERE FOR STEP-BY-STEP INSTRUCTIONS ON CHANGING YOUR FILTER