The pre-filter is the first line of defense against dust and debris from clogging the pores of the carbon itself. Replacement pre-filters extend the life of the Can-Filter. Very low air resistance, Easily changed, Blocks dust and other contaminants from entering filter. A clean Can-Filters Pre-Filter is an excellent way of extending the working life of your Can-Filter.
Helps to prefent dust and debris from clogging your filter
Extends the life of your can filter (sold separately)
Low air resistance