توضیحات :
NFPA 252 – Standard Methods of Fire Tests of Door Assemblies
۲۰۲۲ Edition
Chapter 1 Administration
۱-۱ Scope. This standard prescribes standardized fire and hose stream test procedures that apply to fire door assemblies intended to be used to retard the spread of fire through door openings in fire-resistive walls.
۱-۲ Purpose.
۱-۲-۱ 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
ire protection provided by such assemblies in retarding the spread of fire (flame, heat, and hot gases) through door openings in fire-resistive walls.
۱-۲-۲ The degree of fire protection measured in units of time is not an absolute value because all possible actual fire scenarios are not represented by the standard fire exposure described herein.
۱-۲-۳ This standard allows different fire door assemblies to be compared with each other· in order to evaluate their relative performance as measured against a standard fire exposure.
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