Section 79A(4)(d) in The Tamil Nadu Cinemas (Regulation) Rules, 1957
(d)The side walls of the main building shall be dwarf walls 1.05 metres high plastered with lime mortar or [cement] [Substituted by G.O. Ms. No. 1364, Home, dated the 3rd August, 1992.] over which durable black canvas or tarpaulin curtains shall be provided so as to shut off light and afford shelter from rain.]