On November 13, 2017 at 13:32, thecapnredfish said...
What if the gap were not large enough for air to escape through this gap when the hoax is running? Will it push back into your duct allowing no ventilation? Typicality does not run long enough, but something to think about
The room isn't going to be totally sealed and the fan's blades don't seal against the sleeve- if it did, it would be an impeller. The air that can, will be blown out and once the negative pressure is sufficient, the fan will be basically useless because it will be trying to push against the partial vacuum.
What hoax?
