Flammable storage cabinets must be UL listed and/or the university's insurance underwriter approved.
Flammable storage cabinets are not required to be ventilated. If cabinet is to be vented, it must be ducted into the fume hood exhaust system above the fume hood trim damper. Ducting material must be nominal 2” black pipe.
Corrosive chemical storage cabinets (acids and bases) require venting. It is acceptable to vent under-hood corrosive cabinets into hood interior through the countertop. Ducting material shall be schedule 40 PVC.
New fume hood installation will include flammable and/or corrosive base cabinets.