@nathventilation.bsky.social
No one guesses if their kid has a fever
— they measure it.
Indoor air quality deserves the same
Low Cost Sensors are becoming accessible to more families
— they measure it.
Indoor air quality deserves the same
Low Cost Sensors are becoming accessible to more families
August 16, 2025 at 1:27 PM
No one guesses if their kid has a fever
— they measure it.
Indoor air quality deserves the same
Low Cost Sensors are becoming accessible to more families
— they measure it.
Indoor air quality deserves the same
Low Cost Sensors are becoming accessible to more families
V-Plex air purifiers — DIY purifiers with internal V-shaped filters — are gaining popularity. But two important issues are often overlooked: sacrificed internal volume (the transition chamber) and uncertain airflow paths.
medium.com/@levangelist...
medium.com/@levangelist...
July 30, 2025 at 10:33 PM
V-Plex air purifiers — DIY purifiers with internal V-shaped filters — are gaining popularity. But two important issues are often overlooked: sacrificed internal volume (the transition chamber) and uncertain airflow paths.
medium.com/@levangelist...
medium.com/@levangelist...
8/In the field of ventilation, applying these principles is crucial. The "Manifesto for Ventilation Without Compromise" outlines the commitment to transparency, integrity, and clarity in ensuring truly clean air for everyone. medium.com/@levangelist...
July 1, 2025 at 2:17 PM
8/In the field of ventilation, applying these principles is crucial. The "Manifesto for Ventilation Without Compromise" outlines the commitment to transparency, integrity, and clarity in ensuring truly clean air for everyone. medium.com/@levangelist...
7/ Erika Cheung actions led to the creation of a crucial initiative: Erika Cheung co-founded "Ethics in Entrepreneurship." The idea? Build a culture of integrity from the foundations, so we don’t repeat the mistakes of the past. ethicsinentrepreneurship.org
July 1, 2025 at 2:17 PM
7/ Erika Cheung actions led to the creation of a crucial initiative: Erika Cheung co-founded "Ethics in Entrepreneurship." The idea? Build a culture of integrity from the foundations, so we don’t repeat the mistakes of the past. ethicsinentrepreneurship.org
6/This is why Erika Cheung's TED Talk, the brave whistleblower from Theranos, resonates so strongly. She emphasizes the vital importance of "speaking up when something is wrong," a value that should be deeply rooted in our corporate culture.
youtube.com/watch?v=vMQlj9
youtube.com/watch?v=vMQlj9
July 1, 2025 at 2:17 PM
6/This is why Erika Cheung's TED Talk, the brave whistleblower from Theranos, resonates so strongly. She emphasizes the vital importance of "speaking up when something is wrong," a value that should be deeply rooted in our corporate culture.
youtube.com/watch?v=vMQlj9
youtube.com/watch?v=vMQlj9
🧵Thread on Ethics
1/ Business ethics start from the very beginning.
A startup without ethics will never have any.
Ethics should be a priority and must be reflected in actions.
Beware of the “Fake it until you make it” mentality.
1/ Business ethics start from the very beginning.
A startup without ethics will never have any.
Ethics should be a priority and must be reflected in actions.
Beware of the “Fake it until you make it” mentality.
July 1, 2025 at 2:17 PM
🧵Thread on Ethics
1/ Business ethics start from the very beginning.
A startup without ethics will never have any.
Ethics should be a priority and must be reflected in actions.
Beware of the “Fake it until you make it” mentality.
1/ Business ethics start from the very beginning.
A startup without ethics will never have any.
Ethics should be a priority and must be reflected in actions.
Beware of the “Fake it until you make it” mentality.
4/ My experience includes testing various popular models with my protocol, such as the Northbox Mini, Tempest, Tempest Euro, AirFanta3Pro, as well as several DIY purifiers I have designed or evaluated.
June 24, 2025 at 1:44 PM
4/ My experience includes testing various popular models with my protocol, such as the Northbox Mini, Tempest, Tempest Euro, AirFanta3Pro, as well as several DIY purifiers I have designed or evaluated.
🧵
1/I'll be opening my private test chamber for air purifiers this summer or early fall (located in the Montreal area, Canada). If you have a machine you consider 'super good' and wish to get a CADR measurement, you can contact me via direct message. I will do my best to consider every request.
👇
1/I'll be opening my private test chamber for air purifiers this summer or early fall (located in the Montreal area, Canada). If you have a machine you consider 'super good' and wish to get a CADR measurement, you can contact me via direct message. I will do my best to consider every request.
👇
June 24, 2025 at 1:44 PM
🧵
1/I'll be opening my private test chamber for air purifiers this summer or early fall (located in the Montreal area, Canada). If you have a machine you consider 'super good' and wish to get a CADR measurement, you can contact me via direct message. I will do my best to consider every request.
👇
1/I'll be opening my private test chamber for air purifiers this summer or early fall (located in the Montreal area, Canada). If you have a machine you consider 'super good' and wish to get a CADR measurement, you can contact me via direct message. I will do my best to consider every request.
👇
On ne peut controler ce qu'on ne voit pas.
Il existe de très bons moniteurs qui fournissent toutes ces données en un seul.
Un fabriqué par un québécois, le Visible air modele E visiblair.com/.../model-e-....
au coût de 509$.
Ou bien sur Amazon le Temtop M10 plus à 190$.
Il existe de très bons moniteurs qui fournissent toutes ces données en un seul.
Un fabriqué par un québécois, le Visible air modele E visiblair.com/.../model-e-....
au coût de 509$.
Ou bien sur Amazon le Temtop M10 plus à 190$.
June 9, 2025 at 10:41 AM
On ne peut controler ce qu'on ne voit pas.
Il existe de très bons moniteurs qui fournissent toutes ces données en un seul.
Un fabriqué par un québécois, le Visible air modele E visiblair.com/.../model-e-....
au coût de 509$.
Ou bien sur Amazon le Temtop M10 plus à 190$.
Il existe de très bons moniteurs qui fournissent toutes ces données en un seul.
Un fabriqué par un québécois, le Visible air modele E visiblair.com/.../model-e-....
au coût de 509$.
Ou bien sur Amazon le Temtop M10 plus à 190$.
Just published:
Build the FantaMix — fresh filtered air at home, no exhaust, under $200.
Open-source DIY guide (60 pages, step-by-step).
🧰 HEPA + partial heat recovery
medium.com/@levangelist...
Build the FantaMix — fresh filtered air at home, no exhaust, under $200.
Open-source DIY guide (60 pages, step-by-step).
🧰 HEPA + partial heat recovery
medium.com/@levangelist...
May 16, 2025 at 1:58 AM
Just published:
Build the FantaMix — fresh filtered air at home, no exhaust, under $200.
Open-source DIY guide (60 pages, step-by-step).
🧰 HEPA + partial heat recovery
medium.com/@levangelist...
Build the FantaMix — fresh filtered air at home, no exhaust, under $200.
Open-source DIY guide (60 pages, step-by-step).
🧰 HEPA + partial heat recovery
medium.com/@levangelist...
6/6
Just published the intro:
medium.com/@levangelist...
Open source. Adaptable.
Built for overlooked spaces.
Questions? Comments?
DM are open
Just published the intro:
medium.com/@levangelist...
Open source. Adaptable.
Built for overlooked spaces.
Questions? Comments?
DM are open
May 13, 2025 at 10:52 PM
6/6
Just published the intro:
medium.com/@levangelist...
Open source. Adaptable.
Built for overlooked spaces.
Questions? Comments?
DM are open
Just published the intro:
medium.com/@levangelist...
Open source. Adaptable.
Built for overlooked spaces.
Questions? Comments?
DM are open
5/6
The system costs about the same as a Corsi-Rosenthal box.
Two models:
Upward airflow
Front-facing airflow (with deflector)
Same core components — choose based on your space.
The system costs about the same as a Corsi-Rosenthal box.
Two models:
Upward airflow
Front-facing airflow (with deflector)
Same core components — choose based on your space.
May 13, 2025 at 10:52 PM
5/6
The system costs about the same as a Corsi-Rosenthal box.
Two models:
Upward airflow
Front-facing airflow (with deflector)
Same core components — choose based on your space.
The system costs about the same as a Corsi-Rosenthal box.
Two models:
Upward airflow
Front-facing airflow (with deflector)
Same core components — choose based on your space.
4/6
Here’s the CO₂ impact at in a 180 sq ft bedroom (2 people):
🔴 No ventilation: 3360 ppm
🟢 With FantaMix (max fan level): 617 ppm
A simple build. Big difference.
Here’s the CO₂ impact at in a 180 sq ft bedroom (2 people):
🔴 No ventilation: 3360 ppm
🟢 With FantaMix (max fan level): 617 ppm
A simple build. Big difference.
May 13, 2025 at 10:52 PM
4/6
Here’s the CO₂ impact at in a 180 sq ft bedroom (2 people):
🔴 No ventilation: 3360 ppm
🟢 With FantaMix (max fan level): 617 ppm
A simple build. Big difference.
Here’s the CO₂ impact at in a 180 sq ft bedroom (2 people):
🔴 No ventilation: 3360 ppm
🟢 With FantaMix (max fan level): 617 ppm
A simple build. Big difference.
🧵1/6
I just published the first look at FantaMix, a DIY system that brings in outdoor HEPA-filtered air — and recovers a bit of heat.
It’s simple, low-cost, and works even with tricky window setups.👇
I just published the first look at FantaMix, a DIY system that brings in outdoor HEPA-filtered air — and recovers a bit of heat.
It’s simple, low-cost, and works even with tricky window setups.👇
May 13, 2025 at 10:52 PM
🧵1/6
I just published the first look at FantaMix, a DIY system that brings in outdoor HEPA-filtered air — and recovers a bit of heat.
It’s simple, low-cost, and works even with tricky window setups.👇
I just published the first look at FantaMix, a DIY system that brings in outdoor HEPA-filtered air — and recovers a bit of heat.
It’s simple, low-cost, and works even with tricky window setups.👇
Drying my hair caused PM2.5 levels to spike from 0.1 to 109 µg/m³ in just a few minutes.
Indoor air pollution can be surprisingly high without us noticing.
You can't fix what you don't measure.
Indoor air pollution can be surprisingly high without us noticing.
You can't fix what you don't measure.
April 27, 2025 at 3:18 PM
Drying my hair caused PM2.5 levels to spike from 0.1 to 109 µg/m³ in just a few minutes.
Indoor air pollution can be surprisingly high without us noticing.
You can't fix what you don't measure.
Indoor air pollution can be surprisingly high without us noticing.
You can't fix what you don't measure.
3/3 I also built a second model — larger, ducted, and with much higher airflow.
It uses an AirFanta HEPA filter + 2 Arctic P14 Max fans, with a flexible intake duct.
It’s bulkier, but early anemometer tests show impressive performance.
More details to come once testing is complete.
It uses an AirFanta HEPA filter + 2 Arctic P14 Max fans, with a flexible intake duct.
It’s bulkier, but early anemometer tests show impressive performance.
More details to come once testing is complete.
April 18, 2025 at 6:33 PM
3/3 I also built a second model — larger, ducted, and with much higher airflow.
It uses an AirFanta HEPA filter + 2 Arctic P14 Max fans, with a flexible intake duct.
It’s bulkier, but early anemometer tests show impressive performance.
More details to come once testing is complete.
It uses an AirFanta HEPA filter + 2 Arctic P14 Max fans, with a flexible intake duct.
It’s bulkier, but early anemometer tests show impressive performance.
More details to come once testing is complete.
1/3 DIY window air exchanger with HEPA — built while house-sitting for my partner during her trip down south.
Not an HRV, just a simple air exchanger — quiet, effective fix (~35 dB) for high CO₂ in a tiny bedroom, for under $100. 3–4h build & install 3-night CO₂ test 1h airflow + sound testing
Not an HRV, just a simple air exchanger — quiet, effective fix (~35 dB) for high CO₂ in a tiny bedroom, for under $100. 3–4h build & install 3-night CO₂ test 1h airflow + sound testing
April 18, 2025 at 6:33 PM
1/3 DIY window air exchanger with HEPA — built while house-sitting for my partner during her trip down south.
Not an HRV, just a simple air exchanger — quiet, effective fix (~35 dB) for high CO₂ in a tiny bedroom, for under $100. 3–4h build & install 3-night CO₂ test 1h airflow + sound testing
Not an HRV, just a simple air exchanger — quiet, effective fix (~35 dB) for high CO₂ in a tiny bedroom, for under $100. 3–4h build & install 3-night CO₂ test 1h airflow + sound testing
4/ Then comes the motivation to upgrade equipment.
But step one?
👉 A monitor.
Seeing the invisible is the start of real change.
But step one?
👉 A monitor.
Seeing the invisible is the start of real change.
April 15, 2025 at 11:03 AM
4/ Then comes the motivation to upgrade equipment.
But step one?
👉 A monitor.
Seeing the invisible is the start of real change.
But step one?
👉 A monitor.
Seeing the invisible is the start of real change.
To concretely illustrate the use of the Purifresh in different contexts, I present detailed installation examples:
April 13, 2025 at 1:37 AM
To concretely illustrate the use of the Purifresh in different contexts, I present detailed installation examples:
My Personal Verdict
April 13, 2025 at 1:37 AM
My Personal Verdict
Comparative Snapshot — ERV Purifresh vs. My DIY HRVs
April 13, 2025 at 1:37 AM
Comparative Snapshot — ERV Purifresh vs. My DIY HRVs
Subjective Impressions of Noise — The “Color” of Sound
April 13, 2025 at 1:37 AM
Subjective Impressions of Noise — The “Color” of Sound
Comparison of Performance — With or Without Muffler
Here is a comparison of the Purifresh unit’s performance with and without the muffler.
Here is a comparison of the Purifresh unit’s performance with and without the muffler.
April 13, 2025 at 1:37 AM
Comparison of Performance — With or Without Muffler
Here is a comparison of the Purifresh unit’s performance with and without the muffler.
Here is a comparison of the Purifresh unit’s performance with and without the muffler.
Here are the technical specifications for the Purifresh ERV without the muffler, at two fan speed settings (minimum and maximum), as provided by the manufacturer.
The original data is presented as follows:
The original data is presented as follows:
April 13, 2025 at 1:37 AM
Here are the technical specifications for the Purifresh ERV without the muffler, at two fan speed settings (minimum and maximum), as provided by the manufacturer.
The original data is presented as follows:
The original data is presented as follows: