A microwave with an exhaust fan inside does not necessarily need to vent outside, but it can be beneficial to do so in certain situations. Let's explore both scenarios:
Recirculating (Non-vented) Microwave: Some microwaves come with built-in exhaust fans that recirculate the air within the kitchen. In this configuration, the microwave draws in the cooking fumes and odors, filters them through charcoal or other filters to remove impurities, and then releases the filtered air back into the kitchen. While this setup doesn't require an external vent, it may not be as effective in completely removing cooking odors and steam from the kitchen.
Vented Microwave: Vented microwaves, also known as over-the-range microwaves, have exhaust fans that can be configured to direct the air outside through a duct. These microwaves have a vent at the back or top, allowing you to connect it to an external duct system. When the microwave's exhaust fan is set to "vent outside" mode, it expels the cooking fumes, smoke, and odors outside your home, which can be more effective in eliminating cooking smells.
Advantages of Venting Outside:
- More effective odor removal: Vented microwaves can better eliminate cooking odors and fumes, especially when cooking strong-smelling foods like fish or spices.
- Improved indoor air quality: By venting the air outside, you prevent the recirculation of cooking byproducts, which can help maintain better indoor air quality.
- Reduced heat buildup: Venting outside can help remove excess heat generated during cooking, especially when using the stovetop below the microwave.
Reasons to Opt for Recirculating Mode:
- Lack of external ducting: In some kitchen setups, installing a duct to vent outside can be challenging or impractical. In such cases, using the recirculating mode is a more feasible option.
- Apartment or rental living: If you're in a rented space or an apartment, where making modifications to the kitchen might not be allowed, a recirculating microwave can be a convenient choice.
Ultimately, the decision to vent outside or use the recirculating mode will depend on your kitchen's setup, local building codes, and your preference for air quality. If you have the option to vent outside and are bothered by strong cooking odors, venting to the exterior is generally the preferred choice for better air circulation and odor removal. If venting outside is not possible, regular maintenance of the microwave's filters is essential to ensure optimal performance in recirculation mode.