Hasman are the UK agent for Aeroseal, an innovative sealing technology that seals ductwork leakage from the inside. We can seal ductwork quickly and easily to comply with DW143 and DW144 leakage rates. We can offer improved energy efficiencies and system performance on HVAC systems. Hasman Ltd also specialises in supply to the duct cleaning industry of: Equipment - Lifa Air duct cleaning equipment Training & Consultancy - Business, operational/technical and supervision/project management Materials - Access panels, chemicals, specialist tools and consumables The business is based on 31 years experience in the duct cleaning industry, supplemented by a network of contacts and resources to help make a duct cleaner's business better.