Lightproof Doors (08 34 33)
Featured Project: West Block Parliament and the Visitor Welcome Center (Oct 08, 2019)
Making Your World a Safer Place with Photo Optics (Jun 26, 2019)
Bulletproof Barrier System at The Healing Center of San Diego (Jun 17, 2019)
Shielded Wall Systems from Ray-Bar Engineering Corporation (May 15, 2019)
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For other relevant searches, you might want to try: doors intended to allow use without light penetration for film developing or similar operations; doors with specific characteristics to exclude light.