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yet anecdotal evidence suggests they work very well.
I don’t personally know of anyone who has fitted one without good results, think i would rather run a PIV than a dehumidifier.
Mr_Smyth-
Could well be they work fine. When I worked at the building place I used to see a lot of complaints between customers and tradesmen about them. Companies like Envirovent do a franchise type thing where you become an approved fitter for their products then work as a sole trader but use their branding. It means there's lots of trades out there which suggest them as a solution for every problem as all they do is fit PIV boxes. Much like the damp proofing companies which suggest wall injections as every solution.
Sumo
I've always regarded those as snake oil