Profile: C Caswell Engineering Services Ltd. specializes in design, manufacture, installation, and project management for any ventilation requirements. We provide fresh air ventilation, air conditioning, and heat recovery systems. Our range of services include air conditioning and general mechanical & electrical services. We also specialize in the manufacture and installation of fire and smoke rated ductwork. We design and manufacture sheet metal ductwork, and also provide services including sheet metal ductwork of fully welded construction for use in catering, pharmaceutical & process industries, and general sheet work fabrication.