4" Shop Air Filter
Description
Edit: Changed Inner Diameter Of Filter-Base.Stl To Be A Better Fit On The Blower. Attaches Directly To A 4" 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 2 #8 Or 4Mm Screws And Nuts. Use 1/4" Dowels Or Rods To Tie The Pieces Together. Take The Filter Sheet From A 20"X20" Furnace Air Filter And Wrap Around The Outside, Securing It With Some String On The Ends And On The Middle Brace. The End Result Should Be A Compact Air Filter!
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