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DIY PAPR Blower
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An early attempt at a diy PAPR blower using Milwaukee batteries, Roomba filters, and a 120mm blower fan
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Inspired by but not related to (or using models from) https://www.thingiverse.com/thing:3454725 “Air Supply - Respirator” by mbonadurer.
Posted, but I don't recommend you actually build this. Pillage ideas if needed, but this is very much a work in progress (and I've made no progress in ~2 years).
Uses a 120mm blower fan, voltage cutoff and regulator modules with a M18 battery. Filters are a pair of Roomba HEPA filters, with a charcoal filter screen behind them.