tailieunhanh - Standard Specification for Steel Air Ventilating Grille Units for Detention Areas

This specification applies to air ventilating grille units for detention areas, assembled in part from materials conforming to Specifications A 627, A 628, and A 629; The assemblies described herein are intended to provide two types of security, designated Type A and Type B. | Designation A 750 77 Reapproved 1994 e1 Standard Specification for Steel Air Ventilating Grille Units for Detention Areas1 This standard is issued under the fixed designation A 750 the number immediately following the designation indicates the year of original adoption or in the case of revision the year of last revision. A number in parentheses indicates the year of last reapproval. A superscript epsilon e indicates an editorial change since the last revision or reapproval. e1 NOTE Section 8 was added editorially in June 1994. 1. Scope 3. Terminology This specification applies to air ventilating grille units Definitions for detention areas assembled in part from materials conform- grille unit assembly of steel plate round bars flat ing to Specifications A 627 A 628 and A 629. bars wire mesh and other steel shapes suitably fastened by The assemblies described herein are intended to provide welds rivets bolts or other means in walls and ceilings for the two types of security designated Type A and Type B. purpose of permitting air to flow in or out of detention areas Type A A ventilation unit utilizing homogeneous TR while preventing ingress or egress of persons confined therein. steel bars for the principal security component. Definitions of Terms Specific to This Standard Type B A ventilation unit utilizing perforated tool- Equipment Manufacturer A manufacturer who fab- resisting steel plate for the principal security component. ricates and assembles security products including tool- It is presumed that equipment manufacturers will fabri- resisting steel enclosures for installation in areas requiring cate and assemble the materials so as not to impair the security against ingress and egress. This manufacturer pro- performance characteristics specified in the applicable material cesses the semifinished bar to produce a finished bar suitable specifications. for fabrication into components and is responsible for all heat The .