Sound proofing a boiler cupboard - safe and sensible?

Joined
4 Feb 2017
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Location
East Anglia, England
Country
United Kingdom
I have a modern Baxi combi boiler in my hallway. When it fires up, it is loud. It has a cupboard built around it with a floor to ceiling door, and the frame/side panel made from MDF. this dulls the noise a little but not as much as I’d like.

Between the side of the boiler and then MDF side panel I have about 10cm. I’m thinking about getting a rockwool slab of 5cm and putting it up on the inside of this panel. I’ll cover it with a thin hardboard or something to hide it.

My question is, is this safe or sensible. Boiler is already enclosed of course, and the product says it’s fire retardent (or similar wording). It won’t be pressing against the boiler, with still 5cm of space remaining.

I was going to stick some sort of MLV to the doors.

Does this sound wise or a fools endeavour..
 

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