Wall extractor fans
Wall
— wall fans that work only in one mode — extraction.Such devices resemble domestic extractor fans (see the relevant paragraph), but this similarity is rather deceptive. Firstly, wall-mounted units are usually flat, and during installation, it is located mainly outside, the installation depth is quite small. Secondly, fans of this type have a purely utilitarian purpose, and they are not characterized by designer gimmicks. Thirdly, such devices are quite powerful and performant: relatively modest wall-mounted fans are comparable in performance to the most performant domestic extractor fans.