What device is typically installed in kitchens and toilets to expel odors?

The device that is typically installed in kitchens and toilets to expel odors is an exhaust fan. Exhaust fans are designed specifically to remove uninvited smells, smoke, steam, and other airborne impurities from a room. In kitchens, they help ventilate cooking odors and excess heat, which can otherwise lead to a buildup of contaminants in the air. In toilets, exhaust fans effectively eliminate musty or unpleasant smells, contributing to a fresher environment.

Unlike a humidifier, which adds moisture to the air, or a ceiling fan, which circulates air within a room but does not specifically target odors, an exhaust fan serves the explicit purpose of improving indoor air quality by filtering out undesirable smells. A ventilator, while it provides fresh air circulation, may not focus solely on the removal of odors as exhaust fans do.