Features:

• Fits Research Products Model No. 2200, 2250 (Part #201)
• Original accordion filter.
• Package contains 2 filters.
• Improves air quality in the home!
• Reaches 99% efficiency on particles 5 microns or larger.

Editor Reviews:

Product Description:
Space Gard is also known as Aprilaire Furnace Filters. Improves efficiency and increases longevity of HVAC systems when properly used and maintained. High efficiency filter media collects small dust particles before they can collect on your coils. This product is listed and rated by Underwriters Laboratories as U.L. Class 2.

Rating : - A big fan
I have used this product in three different homes over approximately 25 years.It was originally recommended by a physician to help with a child's allergy issues. It was effective and helped the rest of the family with allergy symptoms. It also kept the house remarkably dust free. Now, the children are all gone and we still would not be without these. Our house is clean, when pollen or ragweed are prevalent the house is a refuge, and we are very happy we've continued with these filters. They are easy to replace, last longer than the six months some advocate to change, and are not expensive. I think they've actually declined in price over the years but I'm not that certain. A bargain!