Why'd better have the window toilet

Some residential bath lavatory is fully enclosed, without Windows, only exhaust fan, and often exhaust fan is not open.According to the view of geomantic learn, must have a window in the bath lavatory, had better be sunny, airiness, reason is very simple, let the polluted gas more easily out of bath lavatory, keep the air fresh.If completely closed, and the lack of ventilation equipment, is certainly adverse to family health, use some air freshener, just change the taste of the air, there is no improvement in the quality of the air.