4" Shop Air Filter

thingiverse

EDIT: Enhanced design for filter-base.stl to ensure precise fit on blower. Directly attaches to a 4-inch blower like this: https://www.amazon.com/gp/product/B06WGR78YZ/ref=oh_aui_search_detailpage?ie=UTF8&psc=1. Secure the base to your blower using two #8 or 4mm screws and nuts. Utilize 1/4-inch dowels or rods to reinforce the connection between pieces. Wrap a filter sheet from a 20x20 furnace air filter around the outside, securing it with string on both ends and the middle brace. The outcome should be a compact and efficient air filter system.