Blanket cave air ventilation system

This is for an 80mm fan and a 37mm diameter hose.

I made it in Blender, so you might need to scale it up 10 fold or so :D

Please be carefull and use at your own risk!

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Update: I didn't expect that this would actually be downloaded and used as much, so here is a more detailled description:

I designed it in a way so that you can dig your entire body under a blanket, including your head, which usually leads to problems breathing and too hot and moist air. This tool has the purpose of sucking out the used air and therefore creating a slight underpressure in the cave you built with the blanket, so fresh air slowly sneaks in and allows you stay there for as long as you wish.

Some people seem to have tested it with air getting blowed under the blanket through the pipe, but i have no experience with that. In my tests under a thick blanket the fan was able to suck out a volume of around 60 liters per minute, which is almost 8 times the