What type of air filter is most commonly found in residential HVAC systems?

Fiberglass filters are the most commonly found type of air filter in residential HVAC systems due to their cost-effectiveness and accessibility. They are designed to capture larger particles like dust, pollen, and pet dander, providing a basic level of air filtration.

Their construction involves layers of fine glass fibers that trap particles as air flows through the filter material. While they may not be as efficient as other filter types, such as HEPA or electrostatic filters, their affordability and ease of replacement make them a popular choice for homeowners looking to maintain good air quality without incurring high costs.

Other filter types, while effective, serve different purposes or are more suited for specific applications. For example, HEPA filters offer high-efficiency filtration for smaller particles, but they are generally more expensive and may require more powerful HVAC systems to handle the increased airflow resistance. Electrostatic filters rely on an electrical charge to capture particles, which can also lead to increased costs and maintenance considerations. Carbon filters are primarily designed for odor removal and may not provide sufficient particulate filtration for general air quality in homes.