Ventilation is crucial for maintaining a healthy and comfortable environment in kitchens and bathrooms. It removes excess moisture, odors, and pollutants, preventing mold and ensuring good air quality. Range hoods and exhaust fans are commonly used in kitchens to eliminate cooking byproducts, while bathroom ventilation systems with exhaust fans manage humidity levels caused by water activities. Proper installation, sizing, and maintenance are important for effective ventilation and maintaining a healthy indoor environment. Ventilation is key to preventing moisture-related issues and creating a comfortable and healthy living space.