Plant room extract.

[JamesP]

Having MVHR in our new build but wondering about having an extract in the Plant room, its not on the drawing from BPC.

It will house an unvented cylinder and buffer tank, etc.  

Any advice appreciated.

Thanks.

[le-cerveau]

I am putting an extract in our plant room, it makes sense as the room will generate heat no matter how well you insulate the tanks.  Although the MVHR extract will not shift much heat it will take some and make an attempt to reduce the heat in there.

[Jeremy Harris]

I fitted an extract in our services area.  It didn't really help the overheating problem we had in there when we had the thermal store, but it did noticeably increase the inlet temperature at the MVHR main extract side, so also increased the fresh air feed temperature a bit.  The overall effect on the house was tiny, mainly because MVHR isn't really much use for redistributing heat, but I still think it's worth doing, for the sake of a bit of duct.  Ours doesn't even have a terminal, the duct just pokes up to near the highest point in that area, but that's really because flow adjustment with our system is via restrictor rings fitted inside the plenum chambers.

[ProDave]

I have included a plant room extract in ours, but mainly because otherwise there would have been more supply points than extract points.

[JamesP]

Thanks, great advice.  @ProDave @JSHarris @le-cerveau 

[joe90]

I have included a "spare" extract in the loft as heat rises so it will accumulate at the ridge ( warm roof) and like proDave it balances the numbers, my plant room won't get that warm.

[Crofter]

31 minutes ago, joe90 said:

I have included a "spare" extract in the loft as heat rises so it will accumulate at the ridge ( warm roof) and like proDave it balances the numbers, my plant room won't get that warm.

 

That's interesting to note. I am considering doing this too, as I have a relatively large warm roof space which will be uninhabited but is within the insulated envelope, and is below the vapour barrier. I think that without an extract. Warm moist air will build up at the apex, and condense on any cold spots that are to be found.

 

With my house being so small, I am actually finding that I want to put in more extracts than supplies. More research required...