Specification for airbricks and gratings for wall ventilation.
NORMA vydaná dňa 30.9.2010
Označenie normy: BS 493:1995+A1:2010
Dátum vydania normy: 30.9.2010
Počet strán: 12
Približná hmotnosť: 36 g (0.08 libier)
Krajina: Britská technická norma
Kategória: Technické normy BS
Class 1 units for external use, and class 2 units for internal use, in concrete, clay, copper, aluminium, steel, thermoplastics and plaster (internal only). Overall dimensions, shape of apertures, unobstructed air space, wall hold, screening, testing of plaster units, impact test for thermoplastics airbricks. Status: Confirmed