The Filter-A-Fan from Eagle America is a simple form of dust control: it’s a frame that attaches to a box fan and allows you to slide in common 16″ x 16″ furnace type filters to filter out dust, sawdust, etc. You choose whether to use inexpensive polyester filters, or the higher quality electrostatic pleated filters. Both the frame and a box fan are included in the $64.98 price.