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Founded by Jack O’Hea in 1931, this Hampshire-based firm designs, supplies, installs and maintains smoke control, ventilation, climate control and solar shading for its clients’ buildings and is still owned by the O’Hea family. Strong demand for its CoolStream products and small acquisitions in Spain and Germany helped raise sales by 15% to £181.4m in 2017, under chief executive Mark Oliver, 56.

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Company details
ActivityVentilation systems provider
Sales £m181.4
Operating profit £m6.7
Main shareholdersO'Hea family (78%), Colt Foundation (22%)

If applicable:

* supplied by Company   † annualised figure   ‡  profit = ebitda