Question is, do I need fire rated MVHR valves anywhere?
I can't discern it from Approved Document B, but I guess it's in there. I can't find the answer here, but I guess it's probably here as well somewhere. I asked my BCO a while ago, he didn't reply. Before I try him again, I'd like to know.
Is there a simple answer? Do we or don't we? Are there rules of thumb?