“Ozone, a lung irritant, is produced indirectly by ion generators & directly by ozone generators. While indirect ozone production is of concern, there is even greater concern with the direct, and purposeful introduction of a lung irritant into indoor air.”
HEPA is a the proven technology.

Unfortunately, “space zappers” have a better marketing team. Lessons learned from other school districts should be applied; local experts consulted.
It’s worth asking Dr Hite if replacement filter cartridges will be included w/each unit that was purchased, along with instructions to teachers or building engineers on their replacement.

True filters absorb virus in aerosol particles and must be cleaned or replaced- like masks.
A study on portable HEPA filters, even with a basic technology, found 90% reduction in aerosols within 30 minutes with a class actively in session, and looked at noise impact as well. medrxiv.org/content/10.110…
The CDC suggests HEPA:

“Consider portable air cleaners that use high-efficiency particulate air (HEPA) filters to enhance air cleaning wherever possible, especially in higher-risk areas such as a nurse’s office or sick/isolation room.”


• • •

Missing some Tweet in this thread? You can try to force a refresh

Keep Current with Sew Face Masks Philadelphia -#masks4all #MutualAid

Sew Face Masks Philadelphia -#masks4all #MutualAid Profile picture

Stay in touch and get notified when new unrolls are available from this author!

Read all threads

This Thread may be Removed Anytime!


Twitter may remove this content at anytime! Save it as PDF for later use!

Try unrolling a thread yourself!

how to unroll video
  1. Follow @ThreadReaderApp to mention us!

  2. From a Twitter thread mention us with a keyword "unroll"
@threadreaderapp unroll

Practice here first or read more on our help page!

Did Thread Reader help you today?

Support us! We are indie developers!

This site is made by just two indie developers on a laptop doing marketing, support and development! Read more about the story.

Become a Premium Member ($3/month or $30/year) and get exclusive features!

Become Premium

Too expensive? Make a small donation by buying us coffee ($5) or help with server cost ($10)

Donate via Paypal Become our Patreon

Thank you for your support!

Follow Us on Twitter!