fitting cooker hood
Usually connected by a flexible connector, the sheet metal riser is just a
cover. An inch each way should be about right.
Is it not usual to have an elbow straight out through the wall, rather than
going up into the ceiling void?
The reason I ask is that I intend to fit a cooker hood, but there is a joist
running parallel to the wall in the ceiling directly above the hob location.
Probably occupies a 3" strip of space from the wall IYSWIM.
Phil
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