The Aprilaire 1620 Whole House Air Purifier is specially designed for special installations where space may be an issue. Your Aprilaire installing contractor will recommend the model that’s right for your system and your needs. The Model 1620 provides highly efficient, whole-home air cleaning and effective removal of pollen and mold. Compare this to a standard 1" air filter, which isn't an air purifier, and doesn't do any of these things.
The Model 1620:
Removes 94% of pollen and mold
Removes 72% of airborne bacteria and fungi
Removes 56% of dust particles
Permanently traps indoor allergens that can lead to respiratory problems