Why doesn't the extractor hood remove cooking smells properly?
Common reasons the hood leaves frying or fish smells lingering in the kitchen: grease-saturated metal filters, a spent charcoal filter, insufficient power, and a blocked exhaust duct.
Recommended steps:
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1. Saturated metal grease filters
The aluminum or steel filters right under the hood trap grease particles before the air moves on to the motor or charcoal filter. Once saturated, they not only let grease through but also drastically cut the airflow the hood can move, so it pulls out less odor even at full motor speed.
💡 Wash them every 3-4 weeks in the dishwasher on a hot cycle, or by hand with degreaser; you'll notice the water comes out cloudy even when they look clean to the eye.
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2. Spent activated-charcoal filter (recirculation mode)
Hoods with no outside vent filter the air and return it to the kitchen through an activated-charcoal filter that absorbs odor-causing molecules. That charcoal saturates with normal use and stops neutralizing smell, even though it keeps pulling air through normally — it's a consumable part, not a permanent one.
💡 Replace it every 3-6 months depending on how often you cook; some models with a washable, regenerable charcoal filter can be baked for 15 minutes at low temperature to partially reactivate it.
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3. Insufficient extraction power or poor speed usage
Cooking on high heat or frying calls for maximum speed, not the middle setting; it also helps to turn the hood on a couple of minutes before you start cooking and leave it running for another 10-15 minutes after you turn off the heat, since odor stays suspended in the air after the pan comes off.
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4. Kinked or blocked exhaust duct
In hoods connected by ducting to the outside, a very tight bend, an overly long run, or even a bird's nest at the outlet greatly reduces the actual airflow being expelled, even though the motor sounds normal from inside the kitchen.
Frequently Asked Questions
How often should the activated-charcoal filter be replaced?
As a general rule, every 3-4 months in a daily-use kitchen or every 6 months for occasional use. Non-washable models lose absorption capacity gradually and imperceptibly, so it's worth marking the replacement date on a calendar.
Does a recirculating hood remove as much odor as a ducted one?
Not entirely. A hood ducted directly outside pushes odor-laden air out of the house, while a recirculating one only filters and returns it, so some residual smell always remains no matter how fresh the charcoal filter is.