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That old air circulator trick I laughed at actually saved my shelter air quality
I spent 6 months building my bunker in my backyard near Tulsa and thought I had the ventilation figured out with a simple pipe setup. My buddy kept telling me I needed a manual air circulator for when the power goes out, and I totally blew him off. After the derecho hit last July and knocked out power for 3 days, I realized my shelter got stuffy and damp fast. I rigged up a hand-crank fan from an old camping stove kit, and the difference in air freshness was night and day within 20 minutes. Now I'm planning to install a permanent emergency crank system, but have any of you found a good way to power a small fan without batteries?
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claire_davis312mo ago
Honestly, @annajenkins is right, this trick really does work.
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blakestone2mo ago
Claire and Anna are both right that this works, but let me clear up one thing real quick. That hand crank fan from your camping stove setup was probably just moving air around, not actually pulling in fresh oxygen from outside. A real air circulator for a shelter needs to be a two-way system that pulls stale air out while bringing fresh air in, otherwise you're just recycling the same CO2. I learned this the hard way when I did a CO2 meter test in my own bunker and saw levels spike even with the fan running. You mentioned getting a permanent emergency crank system, which is smart, but make sure it has separate intake and exhaust ducts or you'll still have stale air problems after a few hours. A lot of folks skip the intake part and end up with condensation issues too (plus mold, which is a whole other nightmare). For battery-free power look at pulley systems that connect to an exercise bike, that's what I'm building now and it moves way more air than arm cranking ever could.
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