Air Trac Corporation - Designs and engineers industrial ventilation, pneumatic conveying systems and services pollution control systems. W. Tombling Ltd - Manufacturer of Activair electrical heaters, polythene ducting, air coolers and fans for use in commercial premises such as factories, warehouses, workshops. Nailor Industries - Air control and distribution manufacturer of grilles, registers, diffusers, VAV terminal units, louvers, and dampers Midtherm Group - Manufacture of flue systems, industrial and commercial fans including axial, bifurcated, chopper, paddle blade, multivane in standard and bespoke designs. Young & Bertke Air Systems Co. - Engineering, fabrication, installation and service in air handling systems and sheet metal fabrication. Penn Barry - Manufacturer of centrifugal and axial fans for commercial and industrial applications. Also makes a line of roof vents and curbs for roof intake or exhaust. Sound Fighter Systems, Inc. - Manufacturer of noise control wall system, industrial ventilation fans, and noise abatement products for air distribution applications. CFW Industries - Manufacturers of industrial fans and air systems for drying, dehumidification, dust collection, evaporative air-conditioning, fume extraction and ventilation. Sodistra Fabrications Isothermes Composites - Manufacture of insulated components in polyester. Products include sandwich panels, air treatment units, custom made insulated ducting, accessories in composite materials. Ray Hudson Limited - Manufacturer of extractor fans and ventilation equipment for humidity control, air extraction and fume removal in commercial and domestic applications. Aereco - Maker of humidity sensitive products including fans, controls, air inlets and outlets for passive and mechanical ventilation - France Midwest Air Products Co. - Designer, manufacturer, and installer of air pollution control systems and equipment. Systems incorporate exhaust hoods, exhaust fans, mist eliminators, scrubbers. Pinnacle Climate Technologies - Manufacturer of air circulation, shutter and exhaust fans, evaporative cooling, controls and thermostats for industrial, commercial, horticulture and agriculture use.