Work on the alternate FAB air solution.Purchased a NAPA hose 2 3/4" diameter inside and 1/4" wall thickness.The gap between the lower filter plate and the bottom of the fiberglass box is a bit less than 16/32". I cut off a 16/32" ring from the hose. This will fit exactly over the fiberglass tunnel I made and will squeeze betwen the two surfaces blocking the unfiltered air.
