I have a 1976 era house with one of these older Xpelair units in it - clearly it isn't modern, it's noisy (as if the blades aren't clearing the housing or part of the unit). So what to do?
I'm unsure about replacing it as I fear the hole is much larger than a modern unit will cover, maybe it needs a bearing and I should disassemble it carefully and see (which could lead to replacement)... Any suggestions?
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Well, I was at a loose end today so thought I'd have a peek behind the Xpelair.
Undid the four screws and removed it from the wall, cleaned it all and put it back. Seems the issue is that there is some movement and you have to push it around with the fan running to get it in the right position to eliminate the noise. Clearly as you pull the string to turn it on/off, there will be some movement and the noise will return. Anyway - this buys me a bit of time... Big hole behind as I suspected, and when running - it's pretty ineffectual anyway.
I'll probably look at a rangehood along these lines as the ducting will hide the hole to a large extent
Anyway - this is what I found once the unit was removed for anyone who is curious:
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