A combination lighting and filtering unit adapted to be mounted in the ventilated ceiling structure of a clean room wherein clean air is directed downwardly into the interior of the room. The unit includes a flow-through light housing having a plurality of florescent light bulbs secured across its interior,...http://www.google.fr/patents/US4461205?utm_source=gb-gplus-shareBrevet US4461205 - Combination lighting and filtering unit for a clean room
Combination lighting and filtering unit for a clean room
