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kkg337-
It’s a 300mm attenuator that I bought from a hydroponic jazz cabbage shop. Reduces the already-quiet Miele extractor to a totally inoffensive background whoosh.
I’ve also got a load of sound deadening foam to line the inside of the ply cabinet with, when I can find the time…
We have the extractor on whenever the hob/oven/toaster are on, so quiet running is essential. Well worth it. MUCH quieter than any downdraft hob I’ve ever experienced.
ectoplasmosis
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.