BS 493-2(1970) : LATEST
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
SPECIFICATION FOR AIRBRICKS AND GRATINGS FOR WALL VENTILATION
23-07-2013
23-11-2012
Describes requirements for two classes of wall ventilating units. Class 1. Airbricks, for use in external walls and Class 2. Wall ventilators or gratings for internal use. Some typical examples of designs are shown in Figs. 1, 2 and 3. Other patterns may however be supplied, provided they comply with the requirements of this standard. Covers definitions, manufacturer's certificate, marking, materials and design, workmanship, dimensions, apertures, wall-hold, additives, screening and testing of plaster units.
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