Cutting 12" Diam hole in blockwork wall
On 18/11/2016 10:02, The Natural Philosopher wrote:
I think this is actually a plan. Remove a whole block from the wall, and
pout the pipe through and make good with fresh concrete.
I suspect the extracted air will go through any shape hole without
complaining. Does it even need to be 12" just because the fan is that
diameter?
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