Validation and a thorough check of existing building ventilation and air conditioning systems. Airflows will be measured and conditions of filters and ductwork surveyed with a full report provided. Ductwork and AHU cleaning, and fogging sterilisation of all systems. Filter cleaning and replacement as required. Improvements and upgrades to ventilation systems to increase air change can be recommended to improve the environmental safety of your office space in the post Covid-19 climate.