A timer is a type of time-switching device that controls and controls Electrical circuits and electrical and electronic devices through time setting (on/off). The timer is basically 8-pin. Like other controlling devices the timer has a coil and when this coil is magnetized, the timer works on/off. The timer has 2 common ends and each common end has normally close and normally open options. When the timer is set by time, the timer trips at the end of that time and turns the common is normally closed (on) to open (off) and normally open (off) to close (on). This is how the timer works.

An exhaust fan is a device that removes bad air from a room. It is a mini fan that has a good speed and it removes the bad air naturally, it is used in the kitchen or small room, mosque, hall room, etc. It is used in single-phase or 3-phase lines. An exhaust fan can be controlled very easily. Air circulation is crucial since it reduces/eliminates odor and humidity problems in all of the rooms. Modern building infrastructure may not even provide enough space for them to have adequate ventilation. It is crucial to have proper ventilation in areas like the kitchen and bathroom. Since the majority of the activities that take place in these rooms produce unpleasant odors and airborne pollutants that must be removed. An exhaust fan is the most effective tool or appliance for this task.