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  • depends on: is the fan position in a wet zone? volume of room? silent? timer? slimline? ducted in-line?

    bathroom extractors are typically 100mm (4"), but if you wanted to really clear the room, fitting a 150mm (6") could be a good idea.

    xpelair, manrose/vent-axia, pretty standard brands

  • equipment must be suitable for zone of use

    if you have the manrose model number then a quick google will tell you its extraction rate, then choose a beefier 4" model to save on hole enlargement

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