I have the air intake where my hands go in (just holes) and the shop vacuum sucks from the back top through some steel wool. So the fresh air is drawn right past the window. The window is IKEA tempered shelf glass for the "as is " section, $2.50! My blast cabinet is made of fiber ceiling tiles held together by 3 inch nails I pushed in by hand and then duct taped the inside seams and strapped the entire thing with 5 huge zip ties. Talk about low buck, it cost me about 15 bucks to make and that included the 60 watt bulb socket I pushed through the side. It sits on an old dresser with a hole in it so the sand can get pushed into the hole and collect in the first drawer., That is where my pickup tube sits J nailed in place. Laughable but works! line the inside with rubber baby bed liners and it should last a while. Now that is Cheap a$$!
