The equipment, processes, and operation of automobile tire rebuilding and recapping plants shall comply with the applicable requirements of this Division and the provisions of this Section. Buffing machines shall be located in a room separated from the remainder of the plant as required under Subtitle 4 of this County Code, and fire doors in such separations shall be maintained free of all obstructions at all times. Each machine shall be connected to an ample dust-collecting system in conformity with NFPA-91. Each room where rubber cement is used or mixed, or flammable or combustible solvents are applied, shall be equipped with approved mechanical or natural ventilation.