A recirculating hood, also known as a ductless hood, is a household appliance used in kitchens to eliminate odors, smoke, and grease generated during cooking. Unlike ducted hoods, which expel stale air outside the home, ductless hoods recycle the air by filtering it before returning it to the kitchen. This type of hood is particularly useful in kitchens where installing a duct is impossible or impractical.
How it works
The operation of a ductless range hood relies on a multi-stage filtration system. When turned on, the hood sucks in stale air through a grease filter. This filter is usually made of metal and captures grease particles present in the air. Once the air has passed through the grease filter, it goes through an activated carbon filter. The latter’s role is to neutralize odors and volatile organic compounds (VOCs) present in the air.
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The activated carbon filter is made up of granules of carbon that trap odor molecules through adsorption. The purified air is then released back into the kitchen. This filtration process helps maintain good air quality without the need to drill holes in walls to install a duct.
Advantages of ductless hoods
Ductless ventil eco range hoods offer several advantages. First, they are easy to install. Since they do not require a duct, they can be installed in any kitchen, even those where it is impossible to drill walls. This makes them ideal for apartments and older homes.
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Next, ductless hoods are often more economical than their ducted counterparts. They do not require additional work for duct installation, which reduces initial costs. Moreover, they generally consume less energy, as they do not need powerful fans to expel air outside.
Finally, these hoods help preserve the thermal integrity of the home. In winter, for example, they do not cause heat loss, unlike ducted hoods that expel warm air outside.
Disadvantages of ductless hoods
Despite their many advantages, ductless range hoods also have some drawbacks. The main one is the need for regular maintenance. Grease filters must be cleaned frequently to maintain the hood’s efficiency. Activated carbon filters, on the other hand, need to be replaced every six months to a year, depending on usage.
Another drawback is that ductless hoods may be less effective at eliminating stubborn odors. Although activated carbon filters are effective, they do not capture all odor molecules. Therefore, it may be necessary to ventilate the kitchen after cooking, especially after preparing particularly odorous dishes.