Installing a washable, polyester pre-filter around your standard
filter element will extend element life, especially in extremely
dusty conditions. Pre-filter material measures approximately 1/2"
thick, comes in 50' rolls. Cut to the desired length and attach using
self-adhesive Velcro strips purchased separately in a 1/2" x 20'
roll. Pre-filter rolls come in several widths, which correspond to
the height of standard Universal and Stoddard filter elements. For
other sizes, the material can be cut with scissors to the desired