This compatible Aprilaire / Space-Gard replacement prefilter 4176 is made for the Aprilaire / Space-Gard model 2275 Portable Air Cleaner.
This air cleaner prefilter is installed through the bottom of the unit. The prefilter removes the larger dust particles from the air as it passes through the air cleaner, removing the harmful particles present in the air throughout your home.
Aprilaire and Space-Gard: 2275