How Does Microwave Vent Work

Microwaves heat food by agitating water molecules in the food. This effect is created by a magnetron device, which converts electrical energy into microwaves at a frequency of 2.45 gigahertz. These waves are then transmitted into the oven cavity via an antenna and bounce around until they encounter something that isn’t metal.

How Does Microwave Vent Work

The microwaves then reflect the antenna and leave as microwaves once again. The microwave vent works opposite to how your TV remote control does; it sends cool air inside the oven cavity so that your food doesn’t cook too fast or burn on contact with hot air from outside of the microwave. Continue reading this blog post to know more cool facts about how does microwave vent works.

Process: How Does Microwave Vent Work

Microwaves work by adding energy to the water molecules in our food. When these molecules gain enough energy, they rotate and bump into other water molecules, transferring this energy through collisions. This process is why microwaves heat your food so quickly. However, this effect only takes place when metal surfaces reflect the microwaves. This is why microwaves heat food on metal trays, but not plastic ones.

Microwaves also wouldn’t work on the moon because there is no metal on their surface. However, if you place a bowl of water on a microwave’s rotating glass plate, you can watch as it heats up without getting burnt. In fact, microwaves don’t leave much residue unless they are reflected off of metal particles or added large amounts of salt to the food. That is why water boils at high temperatures in space but very rarely gets hotter than 212 degrees Fahrenheit (100 degrees Celsius) on Earth.

Difference Between Recirculating Venting Vs. External Venting

Microwave vented hoods have two main types of venting systems:

Recirculating Venting Vs. External Venting

Recirculating Venting System:

Recirculating venting only recirculates air already being filtered by the filters in your microwave. This means that you are not taking fresh air into your kitchen, but rather recycling air that has passed through the filters. Recirculating is best for those who do not want to change their exhaust filters frequently and only need the venting system.

External Venting System:

External venting systems take fresh air outside of your kitchen and sends it back through the filters in the microwave hood. This ensures that new air is always circulated through your oven, so grease and cooking residue do not build up and create an unpleasant odor. External venting is recommended for those who cook with high fat or greasy foods and need to change their filters frequently as a result.

10 Facts About Microwave Vent

  1. Microwave ovens have a fan to cool the magnetron tube. If the microwave did not have a cooling fan, there would be a big problem! When you warm up food in your microwave, the food is warmed by radiation from microwaves produced from electricity from an outlet. This can get very hot.
  2. If you didn’t have a cooling fan, the microwaves could damage the magnetron tube. This would be costly and certainly render your oven useless. Luckily for us, most microwaves have vents that release this air just as a car’s radiator releases hot air from its engine.
  3. The microwave vent is located at the left rear of the microwave oven. This is the left side for right-handed people, and it is to the rear because that prevents food from hitting this area while you unload the dishwasher.
  4. The microwaves are produced inside of a cavity in the magnetron called a waveguide. They are then channeled onto another antenna to be reflected in the cavity.
  5. The fan is located at the back of the magnetron tube and blows air into a cooling vent that then escapes out a slit in the bottom of the microwave oven.
  6. This vent can be found on most microwaves, including low-priced compact models and built-in wall ovens commonly used by builders to install in new homes.
  7. Exhaust fan vents release heat from the magnetron and microwaves to ensure they are not reflecting into the oven.
  8. The exhaust fan is located at the rear of the microwave oven, near where you would find a vent on a stovetop or range hood that works just like the ventilation system for your oven.
  9. The vent is located at the rear of the oven because it kicks out hot air, not cool air. As you remove your items from the microwave, this can be very helpful. It means that the fan isn’t blowing on you as you cook food in your microwave oven.
  10. A microwave oven is a great way to cook food quickly and easily, but you need to wait a couple of minutes before opening it. If not, the fan will keep sending hot air out from inside the oven until the door is closed again.

You Can Check It Out to Turn Off Vent Fan on Microwave

What is an External Non-ducted Venting System?

An external non-ducted venting system can be explained as:  This type of vent is not connected to a vent pipe. Instead, they have a separate outside vent with no inner wall to be vented through. This system is most commonly used in apartment buildings, vacation homes, or small houses.

For your appliance to work properly, the oven has to be vented. Three components make up an external non-ducted venting system to vent the oven correctly:  The outside vent, fan/motor assembly, and power cord. A safety switch is also installed in the cord to prevent overheating.

What is a Microwave Convection Oven?

A microwave oven is an electric oven that cooks or heats food using microwave radiation to produce heat in food items. This cooking method involves the use of electromagnetic waves with a frequency of about 2,450 megahertz (MHz) in the microwave spectrum, which penetrates the food and causes the molecules in it to rotate and build up thermal energy. This leads to heating up of food items from inside out.


Microwave vents are a great way to add more ventilation to your kitchen, but you must make sure they’re installed correctly. Microwave venting is a necessary component of the microwave oven to help ensure that heat energy released from cooking food does not harm people or damage property. Though it may be tempting, this article on how does microwave vent works should give you some insights into operating your microwave with proper ventilation.

Read more about 7 Kitchen Essentials For Everyday Sweet Kitchen.

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