37 Building construction and repair services, namely, installation and maintenance of non-electrically powered devices for reducing moisture and humidity levels in walls of buildings; building construction and repair services, namely, installation and maintenance of non-electrically powered devices for reducing moisture and humidity levels indoors; building construction and repair services, namely, installation and maintenance of devices for reducing moisture and humidity levels in walls of buildings; building construction and repair services, namely, installation and maintenance of devices for reducing moisture and humidity levels indoors