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. Cross References:BS 6954:Part 1BS 6954:Part 2BS 6954:Part 3 BS 12BS 146BS 729BS 882BS 1014BS 1191:Part 1BS 1449:Part 2BS 1490 BS 2782:Part 3:Methods 320A to 320FBS 2782:Part 5:Method 540ABS 4027BS 6017BS 6100BS 6588BS 6610BS 6750BS EN 10130BS EN 10142
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