at work we have expensive fans with a cheap metal mesh around them - to avoid a crying co-worker. at home i have a cheap tower fan with a weird plastic mesh - there are no visible blades on it except if i crank my neck into a really uncomfortable position and shine a flashlight into it. which one of the two can i call bladeless?

luckily i already have a devils advocate and @[email protected] dropped the name of god. how well do i need to hide my fans blade to create a Ventilationbescheißerle?