air conditioning, simple ventilation, super silent

Englisch:Do you also find that your bedroom gets unbearably hot in summer, while it cools down outside and none of the cool air gets in? This is especially bad if you have mosquito netting.I have designed a modular fan holder that can be hooked onto either the roller shutter or the fly screen.The fans can suck or blow. I now use both to improve air circulation. I tested two different fans. This one is super quiet and cannot be heard.The second one has slightly more static pressure and works well with a fly screen. It can be heard very faintly in a really quiet environment.The whole thing runs on a 3-way fan distributor and a 12-volt plug-in power supply.I will make something for the cable routing next.I also printed a small support that can be used to fix a roller shutter at the right height to block light and bypass air. Take a look at this.The fans fit into the holders without glue or screws. The holders can be easily assembled. For sunny locations, I recommend ASA, otherwise PETG.Bo