Synonyms that are in the dictionary are marked in green. Synonyms that are not in the dictionary are marked in red.
Antonyms that are in the dictionary are marked in green. Antonyms that are not in the dictionary are marked in red.
For districts with existing HVAC systems, most had been running MERV 6 or 8 filters, which don’t work well against COVID-19 transmission.
If you have an HVAC system in your home, use the highest rated MERV filter for your system (ideally rated 13 or higher) and set the fan to recirculate air constantly.
The district also added MERV 13 filters in all classrooms and now changes them quarterly.