- For preventing inhalation of toxic dusts, vapours or gases, the workers shall use any of the following types of respirators or gas masks suitable for the purpose, namely: -(a)Chemical-Cartridge respirator;(b)Supplied-Air respirator;(c)Demand flow type respirator;(d)Full-face or half-face gas masks with canister.In no case shall the concentrates of insecticides in the air where the insecticides are mixed exceed the maximum permissible values.
