What we did on the extensions was have a sheet metal shop build flanged duct sections with a plate on one end to close it off. They bolt to the side of the cabinet, so are removable. We drilled the cabinet to match the plate on the opposite end of the duct so it could be used to block off the hole in the cabinet side if we didn't need the extension. Not a bad idea about just extending one side. My buddy is an airplane guy and was talking about blasting wing spars, which is why we extended both ends.
Kevin 1951 Chevy 3100 work truck Follow this saga in Project Journal Photos 1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car) Busting rust since the mid-60's If you're smart enough to take it apart, you darn well better be smart enough to put it back together.
