I love building small parts that fit into my oven. Cured and ready for micro in 1.5hrs. yes! I only needed a 3/4" flange for connecting the air filter to the plenum box so I used some yellow foam and wrapped it in 3 plies of Carbon. Worked great. Now on to micro and paint on this box that hasn't even been tested yet. LOL. Thanks for all the time in the world UL Power!