HOW UNITED SERVICES (W.L.L.) A Leading MEP Contractor in Qatar required the following; HVAC Duct Fabricators / Erectors / Insulators. Applicants for all above MAP categories should have 4 years construction sites experience. Please send CVs with certificate. It is my pleasure and privilege to introduce How United Services (HUS) to you. Established in 2000 as an MEP Contractor, HUS is a joint venture between UK based Interserve Plc.