ABSTRACT
Vertical ventilatin g pipe s (an y material ) no t fixe d with a suppor t bracke t unde r a colla r with a t leas t one fo r eac h storey height. Ref: BS 5572 : 9.3.4.
NONE
OCCASIONAL
FREQUENT
FIXING VERTICA L PLASTI C NOT APPLICABL E NOT SEEN DEFECTS • Vertical ventilating pipes , diameter 75mm - 150mm , supported a t centres greater than 1.8m . Ref: BS 8000: 13: Table 1.
