Ralph, Removing that air foil is a bad, unsafe idea. The purpose of the air foil is to enhance non-turbulent air flow into the hood. When the air flow into a hood is turbulent, some fraction, which could be as large as 80 or 90%, or greater, of the toxic fumes and gases that should have exited out through the venting of the hood now, with turbulence, enter the room where people are working and breathing the toxic contaminated air. Hoods from which those air foils have been removed should NEVER be used as fume hoods until the air foils are replaced and the hood re-tested to be sure it is in compliance with the manufacturer's and installer's specifications. Jay Young
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