Over-the-range microwaves with vent fans have different configurations for venting, and the way they operate can vary depending on the model and installation setup. It's essential to understand how your specific microwave is designed to function to determine if there's an issue or if it's operating as intended.
There are typically two types of venting configurations for over-the-range microwaves:
Recirculating (Non-Ducted) Ventilation: In this configuration, the microwave's vent fan draws in air from the stovetop area and passes it through a filter to trap grease and odors. Then, it recirculates the filtered air back into the kitchen. This type of venting does not exhaust air outside the house, which means it does not remove hot air from the kitchen but only filters and recirculates it.
Ducted Ventilation: In this configuration, the microwave's vent fan is connected to a duct that vents the air outside the house. It pulls in the air from the stovetop area, and instead of recirculating it, it exhausts it outside. This setup efficiently removes hot air, odors, and cooking byproducts from the kitchen.
The default configuration for many over-the-range microwaves is often recirculating venting because it's more straightforward to install and doesn't require external ductwork. However, some models are designed to be convertible, allowing you to switch between recirculating and ducted venting by installing additional components.
If your over-the-range microwave is blowing hot air into the kitchen when the vent fan is on, it's likely set up for recirculating venting. While this configuration is common, it might not be as effective at removing heat and humidity compared to ducted ventilation.
If you prefer to have the hot air and odors vented outside, you could consider converting your microwave's venting system to a ducted setup. To do this, you may need to consult the microwave's user manual or contact the manufacturer to see if your model supports ducted venting and if additional accessories or modifications are required.
Remember that whenever you're dealing with kitchen appliances or making modifications, it's a good idea to consult a professional to ensure proper installation and safety.