My new house has a dark toilet with a window, but it is open in the kitchen, there is 3X1,

Hello, the space volume of your bathroom is a cubic space, the design requirements of the exhaust fan exhaust volume required for the installation of the bathroom, generally in the exhaust volume of 10-12 times, that is, the exhaust volume of the exhaust fan in your room needs 60 cubic meters per hour, but the smallest ceiling air volume of the exhaust fan on the market is 120 cubic meters per hour, you can install a minimum ceiling pipe exhaust fan, you need to pay attention to the aspects, The main thing is that the exhaust pipe must be unobstructed, can be directly connected to the outside, do not connect to the air duct, in addition, because you have no windows in the bathroom, you need to leave a louver or gap in the door and window position of the bathroom, when the exhaust fan is exhausting, you can enter the fresh air, otherwise the exhaust effect is not good, in addition to the exhaust fan does not have a fixed function, you can find a switch with these functions, there is a kind of switch is a sound and light control delay switch, should be suitable for you to use, you can find it, Jing Mechatronic Technology will be happy to help you with any questions you may have about exhaust fans.