TEV has two divisions, Marstair- Refrigeration and Specialist Air Conditioning and Quartz - Fan Coils and HVAC Both Marstair & Quartz have a history of excellence and quality in the industry applying cutting technology within their respected sectors. Manufacturing from their current West Yorkshire base for almost 50 years as divisions of Yorkshire company TEV. TEV, previously part of IMI PLC, has a strong reputation in the air conditioning and refrigeration markets in the UK, Europe and the Middle East. Our expertise ensure both Marstair & Quartz remain two of the leading suppliers of refrigeration & HVAC products in the UK market and throughout Europe. TEV is accredited in the following management systems: BSI 14001:2015 for Environmental Management and BSI 9001:2015 for Quality Management.