Hi all

I see a few other people struggle with this document. I thought I was a pretty logical thinker, yet I just cannot make head nor tail of what they're asking for in the standards and I've done the BPEC training course!

And speaking to the BPEC training guys, some manufacturers and building control they all seem to approach it in a different way of course.

My confusion arises from the following:

1) The measurement test sheet at the back of the Domestic ventilation compliance guide asks for 4 figures: Low & High Extract rates and Low & High Supply Rates. Yet table 5.1a and 5.1b, look like to me that you only specify extract high & low, and supply low. Supply high is left to measurement on the day

2) Everyone seems to use different terminology and mix up the words boost, minimum, maximum, low and high.

3) No explanation is given for what to do when in Step 2, you find that your low extract and high extract are the same, or if you low extract turns out to be higher than your min supply rate, i.e. it is not balanced.

I'm probably just getting confused with what seems like a simple procedure. I just need someone to lay out in plain English the basic principles and steps so I can meet the standards and fill in the test sheet. I think i've read it too many times now I've had a brainfart.

Mucho mucho appreciated!