Yep , I've had fun slapping Notices all over things with inadequate vents. If you BUY (its corgi....) the GSIUR card thing it goes through it. Quite a useful one cos there are more examples than before.
From memory - from nowish until '08 anything less than middling % (40?) becomes AR, and from 08 anything less than 90% is AR.
I'm not sure if it applies to compartment vents for RS appliances too. I looked up part L on flow switches, someone else can do this one!
I'm being strict cos I can't remember the figures and dates, and am implementing it now. Had several visits to fit vents at vast profits.
From memory - from nowish until '08 anything less than middling % (40?) becomes AR, and from 08 anything less than 90% is AR.
I'm not sure if it applies to compartment vents for RS appliances too. I looked up part L on flow switches, someone else can do this one!
I'm being strict cos I can't remember the figures and dates, and am implementing it now. Had several visits to fit vents at vast profits.