| 摘要 |
Permits retrofit trash and linen chute inlet door replacement without destruction of existing B-Label wall/door frame assemblies and introduces advancements never before seen in the chute industry: Compliance to updated U.L.(R) Standards for B-Label doors, smoke suppression, and air tightness. The invention serves as the basis for a new U.L.(R) standard for certified retrofit installation of inlets. The inlet provides applicable ADA compliance. The latter results from several design features including a choice of four-access control/operating systems: mechanical, electronic, electro-pneumatic, and fully pneumatic. Each control system defaults a to the "Fail-Safe/Door-Closed" position in the event of component failure, thereby insuring the continued operation of the U.L.(R) /Life Safety features. Previous art fails in a "door open" position, destroying life safety functionality. Fail-Safe default is the basis of a proposed new NFPA-82 requirement.
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