I have a new boiler on a kitchen wall. The pipes running down from the boiler need to be covered. I would need a three-sided cover made of metal that can be painted or it can be white when purchased. It will need to be, very roughly, 30cm wide, 20 cm deep and 50 cm high. I do not know the technical name for this "box", or where to purchase it. If I google it then I get "channel" design in aluminium, which is the right shape, but these seem to come in very small dimensions (mm). This "box" must be removable, so I need to consider how it is attached to the kitchen wall. Where can I purchase/order this "box".

Thanks in advance.

You won't get anything off the shelf like that.

Google "Sheet metal fabricators mytown" to find local fabs, tell them what you want and what material & they'll knock it up for you.

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I should be dead; I've cheated the Grim Reaper yet again by surviving my third heart attack in June.

why does it have to be metal Alternative is to ask a joiner to make one,the last house we lived in the landlord had one made to match his kitchen cabinets
the house were in now looks like something from the Titanic's engine room

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When in doubt brew up

I made one for the inlaws boiler, folded up the same size as the boiler.
Think it was mirror polished stainless. Drlled and slotted holes to pick up on a couple of the casing screws for the boiler, just needed a long screwdriver to go under/behind it.

As Stods has said, do a drawing, put some measurements on it... take it to a fabrication shop.
Bit of zintec sheet would be ideal if you are painting it.

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Why isn't the number 11 pronounced onety one?