It depends on the type of range hood you have. If your range hood has a charcoal filter, then you need to use it in order to filter the air before it is vented outside. However, if your range hood does not have a charcoal filter, then you do not need to use one.

Do you need a charcoal filter for your range hood? It depends on what type of range hood you have. If it's a basic overhead exhaust fan, the answer is no, you don't need a charcoal filter. But if your range hood has an in-line filter (that is, the filter is located between the fan and the exhaust duct), then you will need to replace the filter every few months with a charcoal filter to help remove cooking odors.