Large area filters cover 1,500 square feet in 15-20 minutes (assumes 8' high ceilings with door closed)
Small area filters cover 700 square feet in 30-40 minutes (assumes 8' high ceilings with door closed)
Made in the USA
Filters are interchangeable if you order the filter in the same size. For example, any of the Junior size filters can fit in a Junior size machine. But the Junior filters will not fit in the larger machines and visa versa.