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Open in app Sign up Sign in Write Sign up Sign in It’s Airborne 404 Followers Follow Home About School Resources HEPA Filters & Air Cleaners Twitter Threads Joey Fox ·Pinned HOW CAN YOU CLEAN THE AIR? W.A.T.C.H. Let’s get this infographic into every classroom! I’ve worked with 3 graphic artists who have helped put this together. Ana Sofia Pinho and Droplet Diaries have been immensely helpful. Alisa Grossutti is the one who created the final design and brought it to completion (Over The Moon Studio). They’ve done… Indoor Air Quality 4 min read Indoor Air Quality 4 min read -------------------------------------------------------------------------------- Joey Fox ·Nov 12 MITIGATING AIRBORNE TRANSMISSION IN YOUR HOME — ASHRAE 241 PART 7 ASHRAE’s recently released standard for control of infectious aerosols also provides guidance on mitigating airborne diseases in residential settings. Here is how you can apply the standard to your home. Clean Airflow Rates The first step is determining the minimum equivalent clean airflow required in a space. The following values in liters/second/person (lps/person)… Airborne Transmission 3 min read Airborne Transmission 3 min read -------------------------------------------------------------------------------- Bob Korman ·Oct 26 UNTANGLING THE ELECTRONICS IN A PC FAN AIR PURIFIER Building a Corsi-Rosenthal box using PC fans isn’t hard, but many people are intimidated by the electronic components. Fear no more! Read this and you should be able to source and put together the electronics for any PC fan air purifier you want to build. At its core, an air… Corsi Rosenthal Box 7 min read Corsi Rosenthal Box 7 min read -------------------------------------------------------------------------------- Bob Korman ·Oct 6 TOPO CHICO BOX AIR PURIFIER Unloading a box of Topo Chico from Costco, I realized the end of the box was about the size of the filter used in our IKEA Uppatvind air purifier. … Corsi Rosenthal Box 17 min read Corsi Rosenthal Box 17 min read -------------------------------------------------------------------------------- Joey Fox ·Sep 21 HOW TO BALANCE CLEAN INDOOR AIR & SUSTAINABILITY As the spotlight on indoor air quality continues to intensify, another critical issue demands our attention. While higher ventilation rates are vital for cleaner indoor air, they come at the cost of elevated energy consumption and greenhouse gas emissions. In order to build a sustainable future, the challenge lies in… Indoor Air Quality 8 min read Indoor Air Quality 8 min read -------------------------------------------------------------------------------- David Elfstrom ·Sep 15 HOW TO MEASURE AN AIR CLEANER’S PERFORMANCE Is it time to replace that expensive HEPA filter, or is it still working? The Clean Air Delivery Rate, or CADR, is a fundamental performance metric for a portable air cleaner. … Engineering 15 min read Engineering 15 min read -------------------------------------------------------------------------------- Joey Fox ·Sep 13 6 WAYS TO CHECK MECHANICAL VENTILATION Creating a safe and healthy indoor environment is essential for our wellbeing and ventilation systems are the primary tool to provide clean air. Many ventilation systems do not perform as designed, often without anyone noticing leading to an unhealthy environment. … Indoor Air Quality 6 min read Indoor Air Quality 6 min read -------------------------------------------------------------------------------- Ryan Tennant ·Sep 10 DIY PC FAN AIR PURIFIER WITH LIGHTS If you want to combine quiet and effective air purification with a customizable light show, this is the DIY PC fan air purifier for you! The PC fan air purifier design described in this article is inspired by the “Healthy Glow” from cleanairkits.com, specifically when considering their tested fan configuration. … Indoor Air Quality 6 min read Indoor Air Quality 6 min read -------------------------------------------------------------------------------- KL Tong, MD ·Sep 10 WOOD OAK PC FAN CR AIR FILTER The original CR box fan served me extremely well for 1.5 years at my family practice. When Omicron was knocking at the door, the original CR box fan was instrumental in keeping me and my patients safe. As others have pointed out, however, it was rather loud and bulky in… Air Quality 6 min read Air Quality 6 min read -------------------------------------------------------------------------------- Joey Fox ·Sep 5 MODEL CLEAN INDOOR AIR ACT — AN OVERVIEW Johns Hopkins Center for Health Security recently developed and published the Model Clean Indoor Air Act (MCIAA), formerly called the Model State Indoor Air Quality Act. If we want to ensure clean indoor air, it needs to be regulated. There needs to be a system in place with transparency and… Indoor Air Quality 6 min read Indoor Air Quality 6 min read -------------------------------------------------------------------------------- Joey Fox ·Sep 1 MY 6 FAVORITE HEPA FILTERS & AIR CLEANERS Portable HEPA filters and air cleaners are the cheapest and quickest way to increase indoor air cleaning rates. They can help protect you from wildfire smoke, allergens and airborne diseases. However, there are a lot of poor products on the market and finding the best ones can be challenging. These… Hepa Filters 7 min read Hepa Filters 7 min read -------------------------------------------------------------------------------- Joey Fox ·Aug 25 KEEPING KIDS IN SCHOOL WITH CLEAN AIR USING ASHRAE 241 With the school year approaching, we need a proper plan to ensure our schools are healthy environments. We now have ASHRAE standard 241 to control infectious aerosols. Here’s how it can be implemented at schools. What tools do we have? There are 4 categories of tools for providing equivalent clean air: Ventilation — supplying outdoor… Indoor Air Quality 8 min read Indoor Air Quality 8 min read -------------------------------------------------------------------------------- Joey Fox ·Aug 22 FANS VS. PLEXIGLASS: OPPOSITE EFFECTS ON INDOOR AIR QUALITY While neither fans nor plexiglass directly purify the air in a space, both influence air circulation, impacting the concentration of pollutants and thereby affecting the potential for airborne disease transmission. Fans and plexiglass have opposite effects on indoor air quality. … Indoor Air Quality 5 min read Indoor Air Quality 5 min read -------------------------------------------------------------------------------- Joey Fox ·Aug 9 IMPROVING HOME INDOOR AIR QUALITY Ensuring good air quality in your home can play a significant role in your health and prevention of disease. This post will go through three different aspects of ensuring good indoor air quality: source control, ventilation & filtration and mitigating airborne disease transmission. Source Control While removing pollutants from the air is… Indoor Air Quality 9 min read Indoor Air Quality 9 min read -------------------------------------------------------------------------------- Joey Fox ·Aug 4 TRANSPARENCY & BUILDING READINESS PLAN — ASHRAE 241 PART 6 Can you imagine if schools and long term care had to publicly document their ventilation and other air cleaning measures and share it with building occupants/relatives? It’s impossible to advocate for clean air without any evidence that the air is not clean and facilities are able to hide behind a… Indoor Air Quality 3 min read Indoor Air Quality 3 min read -------------------------------------------------------------------------------- Joey Fox ·Aug 3 STOPPING AIRBORNE TRANSMISSION — DESIGNING ISOLATION ROOMS & LOW OCCUPANCY SPACES Introduction The clean air delivery rate (CADR) measures the rate at which clean air is supplied to a space, forming the foundation for assessing the risk of airborne transmission within it. For every instance of airborne transmission, there exists a critical CADR. If the CADR surpasses this critical threshold, susceptible individuals… Airborne Transmission 9 min read Airborne Transmission 9 min read -------------------------------------------------------------------------------- Joey Fox ·Jul 31 ASSESSING COVID-19 RISK AT A MOVIE THEATER I took this CO2 reading in a theater. So how high is the risk of airborne transmission based on this value? It’s actually not as high as you would expect, but still not good. What does the CO2 tell you? CO2 tells you how much air is rebreathed from others. In this case, it was over… Covid-19 4 min read Covid-19 4 min read -------------------------------------------------------------------------------- Joey Fox ·Jul 30 THE MINI PC FAN CORSI-ROSENTHAL BOX It did not take too long to optimize the classic box fan Corsi-Rosenthal Box. Once the filters were assembled in the shape of a box and the shroud was added, it was pretty much optimized: easy to build, inexpensive and effective. PC Fan CR Boxes, while being more quiet, are… Corsi Rosenthal Box 3 min read Corsi Rosenthal Box 3 min read -------------------------------------------------------------------------------- Joey Fox ·Jul 26 INFECTION RISK MANAGEMENT MODE — ASHRAE 241 CONTROL OF INFECTIOUS AEROSOLS PART 5 Introduction ASHRAE Standard 241 provides a procedure for facilities to mitigate the spread of airborne diseases which includes increased equivalent clean airflow rates compared to what is normally required. However, it does not compel the facilities to always provide these rates. It is only required during Infection Risk Management Mode (IRMM)… Airborne Transmission 5 min read Airborne Transmission 5 min read -------------------------------------------------------------------------------- Joey Fox ·Jul 24 ASHRAE 241 — CONTROL OF INFECTIOUS AEROSOLS: COLLECTION OF POSTS Here’s a collection of the posts I have created explaining parts of ASHRAE standard 241. Part 1: History of the Standard ASHRAE 241 Control of Infectious Aerosols Part 1 — The History of the Standard On June 24, 2023 , the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) published a…itsairborne.com Part 2: Equivalent Clean Airflow Rates ASHRAE 241 Control of Infectious Aerosols Part 2— Equivalent Clean Airflow Rates Here is how the new standard compares to the old indoor air quality standard and guidance from other organizations.itsairborne.com Ashrae 1 min read Ashrae 1 min read Want to know how to stop COVID and other airborne diseases? Interested in ventilation, filtration and UV to clean the air? This blog has it all. Follow EDITORS JOEY FOX Follow Help Status About Careers Blog Privacy Terms Text to speech Teams To make Medium work, we log user data. By using Medium, you agree to our Privacy Policy, including cookie policy.