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This photo was taken outside the door leading the area used to prepare to enter the clean room.

The sign reads

SSDIF CLEAN ROOM UNIQUES

• Largest laminar flow clean room in the free world (100 ft wide x 125 ft long x 90 ft high)
• Class 10 clean room, called calss 10,000
• Accommodates 2 full-size shuttle payloads simultaneously
• Has a 25 ft x 40 ft access door
• Has a laminar flow cleaning area
• Has a clean room change room
• Construction materials selected for minimum hydrocarbon out-gassing
• Has 2 35 ton cranes (69 ft & 80 ft hook heights)
• Will operate 50 years without HEPA filter changeout
• Has a software operated mechanical control system
• Has a perforated return air grille
• Has a "redundant roof"