The bathroom is ready to install a ceiling ventilation fan, and the ventilation duct is 7 meters, so

The amount of exhaust in the bathroom, mainly depends on the size of the bathroom, and I calculated the area of your bathroom

Generally speaking, install a 120 cubic meter per hour ceiling pipe exhaust fan, so that you can play an exhaust effect, your pipeline is 7 meters, not very long, as long as you use a smooth pipe with an inner wall, it does not have much impact on exhaust, I recommend you to consider the exhaust fan of the integrated ceiling series of the green island wind exhaust fan, or the plastic ceiling pipe exhaust fan, which is suitable for the bathroom exhaust use of your room, Or you can contact Jing Mechatronic Technology and we will provide you with practical advice on the installation and purchase of exhaust fans.

The exhaust volume of the bathroom mainly depends on the size of the bathroom, and I calculated the area of your bathroom, probably.

version of 3-4 square meters, floor height of 3 meters, space only right 9-10 cubic meters of space, generally speaking, install a 120 cubic meters per hour ceiling pipe exhaust fan, so that you can play an exhaust effect, your pipe 7 meters, not very long, as long as the inner wall of the smooth pipe, there is not much impact on the exhaust.