Ventilation Surveys and Services Ltd provide nationwide coverage for the following services: Ventilation Cleaning and Mainten ... ance Air Conditioning Installation & Maintenance Fire Damper Inspection and Test HVAC Commissioning and Balancing Fire Door Inspections Formed in 2011 we now directly employ over 90 staff and have revenue exceeding £5 million per annum. We are BESA members, ISO9001:2015 accredited, Safecontractor, Altius, Constructionline, REFCOM and BESCA approved. read more