Nispira HEPA Replacement Filter for Holmes HAP1203 Tower Air Purifier – True HEPA with Activated Carbon Pre-Filter Filter Diameter of hollow circle is

Diameter of hollow circle is about 0

25 in x 5 in x 1

so we use about 60g of ground coffee

replace every 2–4 weeks depending on water quality and fountain usage

Nispira HEPA Replacement Filter for Holmes HAP1203 Tower Air Purifier – True HEPA with Activated Carbon Pre-Filter Filter Diameter of hollow circle isProduct Overview Keep your indoor air cleaner and your purifier running efficiently with the Nispira Replacement Filter Set, designed for the Holmes HAP1203 tower air purifier. This complete set includes a True HEPA filter and activated carbon pre filters to support everyday air cleaning and odor reduction. Compatibility Compatible with air purifier models from Holmes, including HAP1203 tower air purifiers. This is a compatible replacement filter set