MDH is a division of BIOQUELL UK Ltd and has over 35 years experience in the research, design, development, production and support of Collective Protection (COLPRO) systems for the Nuclear, Biological and Chemical (NBC) defence industry. Products include: Vehicle NBC Filtration Systems, Vehicle Crew Cooling Units, Ship NBC systems, Unhardened Collective Protection (UCPS) Systems, a range of NBC filters and support equipment.