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Replacement Filter for Aprilaire # 2400 Air Cleaner, 2-Pack
(case of 2 Filters)

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In Stock
Price: $39.90
($19.95 ea)
case of 2 Filters

Replacement for Aprilaire/Space-Gard # 401 Filter, 2-Pack 

The Honeywell "Micro Defense" CF2400A1001 filter is designed to fit the popular Aprilaire / Space-Gard 2400 air cleaner and replaces original part #401.  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 your pleat spacers (NOT INCLUDED). Assembly instructions are printed on the product carton.


  • Electrostatically-charged fibers capture harmful household air particles
  • Captures pollen, dust, mold spores, smoke, and other household allergens
  • Accordian design saves space in your mechanical room
  • Pleated filters provide additional surface area to hold dust and dirt
  • MERV 10 performance rating
  • Filters last from 6 months to 1 year, depending on evironmental conditions and fan hours
  • Can replace Aprilaire filter # 401, BestAir # SG4PR and SG4, Lennox # X0444

Installation Notes:
The air cleaner media in the Model 2400 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.

Note: This product is not manufactured or distributed by Research Products Corporation, owner of the registered trademark AprilaireŽ.

Filters are expanded into existing plastic frame and held in place with existing pleat spacers


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(case of 6 Pleat Spacers)