NFPA 252门组件防火试验
日期:2020-03-30 14:47
dures that apply to fire door assemblies intended to be used to retard the spread of fire through door openings in fire-resistive walls ，The purpose of this standard is to prescribe specific fire
and hose stream test procedures for fire door assemblies in order to standardize a method for determining the degree of fire protection provided by such assemblies in retarding the spread of fire (flame, heat, and hot gases) through door open- ings in fire-resistive walls The degree of fire protection me
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12/23 17:56