Since 1974, Specific Systems, LTD. has been building special purpose environmental air-conditioning, heating, ventilating and pressurization systems with a commitment to reliability, service and design excellence. Specific Systems specializes in building the best explosion proof HVAC air conditioners in the world. This has been accomplished through proven engineering and design principles, combined with a dedication to continued improvements in our standard modular products. With this strong engineering focus, Specific Systems leads the industry in modular environmental control system technology. You can always depend on Specific Systems to perform to full capacity. We combine our expertise in HVAC with our knowledge of the petroleum and chemical industries to provide packaged solutions to highly corrosive and hazardous (Class I, Division 1, Groups C and D) locations. Our InPac line is available in several formats to fit the needs of individual applications. Vertical, through-the-wall (standard) Horizontal, roof-mount Split condenser/evaporator Pad mount Specific Systems is a privately held company, and our focus is on our customers—not shareholders. We ensure a level of service after the sale that is second-to-none.