Walraven operates three divisions. BIS Fixing Systems for heating systems, sanitary installations, sprinkler pipes, air ducts, cooling systems, cable troughs and much more.BIS Fire Protection Systems for smoke proof and fire resistant sealing of pipe apertures and recessed light fittings, as well as products for the fire retardant fixing of pipes and BIS Sanitary Systems Concealed Pre Wall systems, Alpro inspection hatches and products for sanitary installations.

Senior Hargreaves is the UK’s largest industrial metal ducting manufacturer. The company also has a national chain of trade Duct shops supplying quality ducting products to heating and ventilation HAVC engineers throughout the UK. Senior Hargreaves also supply complete ranges of fans, diffusers, dampers, stainless steel and steel ventilation ducts and ventilation grilles.

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