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I read somewhere that the heat generated by cooking (and showers) replaces lost heat anyway so venting straight out isn’t much of a problem
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How airtight is your house? If anything other than ‘quite’, then dMVHR (decentralised) prob not the one. Look at dMEV instead (continuous extractor which auto-boosts based on humidity levels).
In either scenario, if you’re looking to switch from a vented extractor to a recirculating one, make sure you don’t cheap out on it. Budget recirculating extractors are loud and ineffective. Also factor in carbon filter replacement costs, and the effort of cleaning the grease filters regularly.
We have a mid-range Miele extractor (bought new-in-box on eBay for £300) in recirculating mode, with cheap third-party carbon filters. It’s very quiet, and very effective. I fitted a silencer/attenuator to it, and it’s even more unobtrusive and refined now.
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dbr
ectoplasmosis
@cozzzzzzzz
if I want to replace an existing kitchen extractor fan (which vents to the outside) with a heat recovery ventilation / extractor fan, is there a recommended unit?