2.02. Exceptions: This Decree does not govern the following:(a) metal framework and hardware;
(b) the accessory part of an apparatus, a machine or piece of equipment not included in the jurisdiction when it is made by the firm that makes the apparatus, the machine or piece of equipment;
(c) doors, sashes, frames and sills intended for residential buildings;
(d) doors, sashes, frames and sills manufactured in mild steel and intended for industrial and institutional commercial buildings and where the metal thickness used is between 22 gauge and 10 gauge inclusively.