Choosing an air filter can be confusing, but it needn’t be.
1. Determine the room dimensions or person capacity
To reduce the risk of transmission we aim to introduce as much fresh or filtered air into a space as possible. The World Health Organisation recommends a minimum of 6 air changes per hour (ACH) or 10L/p/s1. Some activities like high intensity exercise or singing are likely to require significantly more than this 2.
2. Determine acceptable noise level
Different environments have different noise requirements. Air filters with higher noise levels (eg above 50dBA) are acceptable in already noisy environments like gyms and cafes. Quiet restaurants or classrooms will require air filters with lower noise levels (eg below 40-45 dBA)
3. Determine how many you need
Some spaces will require more than one air filter. Several air filters spaced around a room will also provide more effective filtration than a single filter.