When you purchase Lindhaus paper bags type D3, four of these filters are included in the box. Purchase additional Filtrete filters if you wish to change them more frequently. All Lindhaus DP-5 (not HEPA) and DP-5 Evolution series uprights use this filter as their standard exhaust filter. The filter size is 3 1/16" x 2 3/8". It fits in one of the frames on the sides of the vacuum's main body. Each vacuum requires two filters like this one.
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Lindhaus Vacuum Supplies.