Hayhurst classrooms need more filtration capacity
Even with the Intellipure air purifiers running at their tolerable noise level (half speed):
✘ Classroom with the lowest airflow: Rm 19 – One of Hayhurst’s 4th grade rooms
1.6 air changes per hour*
With ventilation & filtration this low, how long do kids’ and staff’s viruses in their respiratory aerosols linger in these 4th graders’ air?
>1 hour and 26 minutes
At 1.6 air changes/hour, 1 hour 26 minutes is how long it takes for the HVAC system and Intellipure to clear out 90% of the respiratory aerosols being produced when kids and staff breathe, talk, sing, cough and sneeze.
✘ 12 more Hayhurst classrooms have less than 2 air changes per hour and 2 classrooms have exactly 2 air changes
At 2 air changes per hour, it takes the HVAC system and Intellipure 1 hour and 9 minutes to clear 90% of the respiratory aerosols.
✘ 1 more classroom is between 2 and 3 air changes per hour & 5 more are between 3 and 6 – all below recommendations
Only 1 classroom has safe air with ventilation and filtration providing 6 air changes per hour or more, clearing 90% of aerosols out in 23 minutes or less.
Music in Room 21: 6.8
***One bright spot at Hayhurst!
Music class, where kids are producing more respiratory aerosols while singing and playing instruments, has decent airflow – Just 20 minutes to clear out 90% of aerosols in Rm 21
The Music room at Hayhurst has good airflow, but it could be even better. At 12 air changes an hour, aerosols clear out by 90% in under 12 minutes.
The Intellipure air purifiers are insufficient in Hayhurst classrooms
An Intellipure running at its tolerable noise level only provides 182 cubic feet of clean air per minute. Even at its highest speed setting, which is too noisy, an Intellipure only provides 270 cubic feet of clean air per minute.
Hayhurst classrooms need additional, high quality air purifiers to provide safe air to kids now, when HVAC system overhauls will take the district years to do in all schools.
PPS staff need to order additional air purifiers for Hayhurst from the Oregon Health Authority by April 28
The Oregon Health Authority first opened this program at the beginning of April, and at that time, PPS planned to order “no additional units.” But parents like you across our district organized with us to help district staff and leaders understand the need to take full advantage of this opportunity to obtain better air purifiers at no cost to PPS. The district announced initially that they would order only 600 units, but we have over 2600 classrooms in the district.
Parents in our network stepped up again, and our work paid off! PPS announced that they have placed an order for 3500 air purifiers.
We will see for sure how many of which models each school will get when the orders arrive, but we expect this to result in each classroom in the district either having two Medify air purifiers or one Intellipure and one Medify air purifier. And we hope the order will include the MA-1000s for gyms, cafeterias, large libraries, large music rooms and performance rooms, and other large communal spaces that serve students and staff. With both an Intellipure and a Medify, teachers can set the two air purifiers at a quiet speed, but still get more clean air delivered to the room than one Intellipure can deliver, even when it is set at it’s highest setting!
We’re not done working for cleaner classroom air, though. You can still join us below to learn more!
Highlights of our preliminary classification of providing Medify’s to Hayhurst using OHA’s suggestions for how to distribute them
3 Medify MA-50’s, 24 Medify MA-112’s, and 4 Medify MA-1000’s would:
- Bring all 22 Hayhurst classrooms to above 3 air changes an hour
- Bring the cafeteria to from 2.5 to 3.4 air changes an hour
- Bring the library up from 1.9-2.2 air changes to over 5 air changes per hour
- Have classrooms ranging from 3.2 to 8.7 air changes per hour
Join us in asking PPS and OHA to add these new filters while also maintaining the existing filtration capacity the Intellipures provide.
How can you help?
We need to make sure PPS and OHA provide more air purifiers to Hayhurst – Sign up to help advocate for PPS ordering these units and OHA granting them!
Let’s get more air filtration in the 16 Hayhurst classrooms that do not even get 3 changes of air per hour and the 5 classrooms that only get between 3 and 6! And let’s make sure Hayhurst’s cafeteria, where kids pack in close to eat lunch, and library and other key spaces get better air quality.
Join us to be part of a group of parents and community members advocating for strategic, effective, and science-based planning for sufficient ventilation and filtration capacity in PPS schools — including Hayhurst.
Sign up on our signup form to also help make a better proposed plan for Hayhurst. Facilities staff worked hard to get the Intellipures, but PPS left serious gaps in the ventilation and filtration in elementary, middle school, and K-8 schools across the district.
So we would like participation and feedback from more PPS community members – parents, family, and actual staff in our schools – on what spaces in each school are actually used for what, so that PPS kids and staff, including kids and staff at Hayhurst, get more of the quiet, effective filtration capacity that they need. Sign up below to join our organizing for PPS air quality!
*Notes on our numbers
Air changes per hour given here are “equivalent” and include ventilation and filtration. These numbers are based on the district’s airflow report for Hayhurst, conducted in August 2021 (available at tinyurl.com/hayhurstairflow) but corrected using specifications from the manufacturer of the Intellipure units to allow calculation of air changes per hour with the Intellipure at half speed instead of the district-provided air changes per hour with the Intellipure set at full speed.
Also, please note that the total classrooms across the district below 3 and between 3 and 6 are 597 / 1111 and counting…