1) The first one is not specific enough (Disinfection of the Fresh/Exhaust Air System): including FAF/PAU Coil cleaning, fresh air ductwork cleaning???2) Change the filters at the fresh air system only. The main concern could be at the recirculation air within the floor. Thus, the filter at the floor AHUs/VAV air boxes should be replaced instead.3) & 4) are talking about cooling tower. They shouldn’t be part of the precaution works on the COVID-19 but legionella instead.5) till 10) are fine but no frequency is specified. It is subject to the interpretation of the vendor/maintenance staff.