An illustrated guide to the building mechanical and electrical codes by redwood kardon et al conditions requiring a window to have tempered glass include a window lower than 18 inches from the ground larger than 9 square feet in area with a top higher than 3. 1981 specification for impact performance requirements for flat safety glass and safety plastics for use in buildings and either must not break or must break safely. Safety glass is defined as glass which must have passed an impact test currently bs 6206.
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