A highly portable AirMeter.io device with an ePaper display that has great battery life even when connected to WIFI. The display provides live readings, charts and access to the CO2 sensor calibration sequence.

Protective outer case for Aranet4 CO2 meters.

CO2-Ampel is an open-source CO2 sensor designed to be self-built.

Based on the Corsi Rosenthal box filter concept. Accepts MERV or EPA filters. Multiple material options. For batch or mass manufacture globally using, box, cage, or commercial plate fan types.

New build with Arctic P14 PWM PST + 4 Ikea Starkvind. The purpose of this build was to use all 5 fans in the P14 5-pack and to go as low-cost as possible with fans + power supply.

A smaller version of the Corsi/Rosenthal Box Air Cleaner.

This is a smaller version of a Corsi-Rosenthal Box used for air filtration/purification with 12 inch furnace filters.

The Corsi-Rosenthal Cube (sometimes called a Corsi Box) is an inexpensive, do-it-yourself air cleaner.

Heater Bloc’s guide to building a tent-safe copper coil alcohol heater.

Central repository for basic rectangular air purifier designs using PC fans, MERV13 filters, power splitters, and varied frame material. The guides include a BOM and detailed, layperson-accessible instructions.

A small, portable air filter incorporating a 3DP frame, PC fans, MERV13 filters, and a USB power source. Ideal for air cleaning closest to the user, such as desktop or bedside.

Based on the popular Starkvind Corsi box design, this tabletop or floor model uses a 3DP frame, three Ikea Starkvind filters, and eight Arctic P14 PC fans.

Based on the popular Starkvind Corsi box design, this small, portable tabletop version has a 3DP frame, 2 Ikea filters, and 4 Arctic P14 PC fans.

Small, portable, rechargeable air filter that cleans a car or truck cab interior.

Portable, packable air filter designed to be transported flat and assembled on location. Includes Filtrete 1900 filters, 3DP grids, and dxf files for chipboard or aluminum cutting.

Wearable, portable, rechargeable design intended for air cleaning closest to the user, especially for indoor scenarios where a mask can’t be worn (such as a dentist exam). Components include 3DP frame, QT3 HEPA filter, and Arctic P14 fans.

"This solution is similar to triple glazing. In our case, support is provided by a frame made from PVC piping. Around this frame, we wrap a single sheet of polyethylene. We secure this polyethylene using the insulation noodle attached to the frame. We then wrap the outer frame using more polyethylene. This results in a triple-glazed polyethylene sheet. In case you wish to protect against rain and other elements, you can strap a sacrificial sheet to the outside of the window."