• BS 493:1970

BS 493:1970

Specification for airbricks and gratings for wall ventilation

BSI Group , 12/14/1970

Publisher: BS

File Format: PDF

$132.00$264.16


Class 1 units for external use, and class 2 units for internal use in concrete, clay, cast iron, copper, aluminium steel, plastics and plaster (internal only). Overall dimensions, shape of apertures, unobstructed air space, wall hold, screening, testing of plaster units. Illustrations of typical examples.

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