Bathroom through-wall extract fan

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Apologies, if not the correct forum but couldn’t find one more appropriate, I am replacing our 4” extract bathroom and notice that both the original and new fans don’t fit flush onto the tiles because they fit into a downwards facing pipe fitted through the wall. I had considered using flexible ducting pipe but am worried that the breeze block would puncture the fragile material. Any advice? Many thanks.
 
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How would a flexible duct help if the slope is within the wall. You will have to bodge it or re core the hole.

Probably better off posting in the plumbing or building forum.

Blup
 
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Do you mean it slopes downwards to the outside, so that any condensation or rain will run out? That's OK, but how steep is the slope?

You might need to chisel it a bit loose at the room end so the spigot of the fan can go in.

You might need to fabricate a plastic connector to accomodate the bend

Photos will help.
 

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