The Fail-Safe CFD Cleanroom Troffer is enclosed and gasketed to maintain ceiling integrity and protect against infiltration of particles and airborne bacteria. The housing and door are designed to work with 1" inverted T-Grid ceilings. The sealed, hole-free housing prevents air exchange between the fixture and plenum and allows relamping without contamination of clean areas. UL/cUL listed for wet locations for covered ceiling applications, and are manufactured in accordance with U.S.D.A., F.D.A., and Federal Standard 209E.