How do HEPA filters work in schools and how long do they last?

<p>Joe chats to o-Founder of the company AerNua Marie Therese McCormack about how HEPA filters work and how durable they are</p> &#10;&nbsp;<br /><hr><p style='color: grey; font - size: 0.75em; '>See <a style='color: grey; ' target='_blank' rel='noopener noreferrer' href='https://acast.com/privacy'>acast.com/privacy</a> for privacy and opt-out information.</p>