HEPA Positive Pressure Hood 12v blower

thingiverse

Here is a HEPA-Positive-Pressure-Hood made with a 5v blower fan and a 86889 HEPA vacuum filter: https://www.thingiverse.com/thing:4213526 Github: https://github.com/PhilMo7/HEPA-Negative-Pressure-Hood This is a HEPA filter built using a 5 or 12v blower fan and an 86889 HEPA vacuum filter. It's designed to be used with either a 3M half-face respirator, a gas mask with 40mm threading, or any large clear plastic bag as a full-head negative-pressure hood. I created this for myself and anyone else working in healthcare who may not have access to enough equipment to protect themselves. With a 2mil or 3mil optically clear bag, you should have full-face protection that allows unrestricted breathing and movement. The bags can be easily removed and disposed of with basic precautions. The whole unit can be disassembled and sanitized as needed, or an alcohol solution can be used to sanitize without damaging the motor of the fan. Because it uses a standard CPAP hose, a CPAP ozone-based sanitizing unit could also be used to sanitize if available, although this may cause additional wear on the motor from the ozone. The idea came from an article about one of Wuhan's doctors who used a car HEPA filter in a similar way. Unfortunately, I was unable to find the article again. Airflow for use with a bag is more than enough for what the average human breathes. It does work with masks or respirators as well but not as effectively and still requires some lung force to draw air through the filter. Parts list: - HEPA filter: https://www.amazon.com/gp/product/B07DMCKPGJ - Prefilter: https://www.amazon.com/gp/product/B000U204W2 - 12v blower fan: https://www.amazon.com/gp/product/B07RMJC9NT - 8 M5x10 computer fan screws: https://www.amazon.com/gp/product/B07MPB94JG - 6ft CPAP hose: https://www.amazon.com/dp/B01N4RGZ80/ref=psdc_8627104011_t3_B07Q87VZ62 - Silicon or glue for sealant I used extra-large clear 2mil bags. These have proven strong and clear enough to read text without much problem. https://www.amazon.com/gp/product/B073W23GDF You can find thicker bags or buy 2mil in bulk from many suppliers. https://www.uline.com/Grp_3/Poly-Bags-Flat-Open Instructions: - Cut the CPAP hose to length and seal the cut end into the outlet adapter. If doing this, wait for the sealant to set before continuing. - Add sealant around the edge of the fan and place it in position. - Add sealant around the groove for the outlet adapter and set it in place. - Seal around the edge of the fan cover and screw it into place. - Add additional sealant to the fan's cord coming out of the case. - Let it set for 12 hours, then run the fan for an additional 12 to 24 hours to fully cure the sealant and remove any residual gases or smells from the sealant. - You can now set the filter into place and cut and fit a prefilter. Then screw the fan cover into place. For use with a bag, screw the adapter into the bag with the hole for the hose facing outward. Once half was screwed in, cut around the inner edge, then finish screwing it in. Fit the rubber end of the hose into the adapter. TURN ON THE FAN before putting the bag over your head, then tuck it into the collar of your shirt. The 3M mask adapter consists of two parts: the 3MCoupler and the 3MAngle. These should be glued or siliconed together.