whaleshark

I thank you both for the advice and recommendation. I had read the various recommendations that said to avoid that duct however the design needs a branched system and the branch will be mainly running behind an ashlar wall. I have designed the system including static pressure loss, flow rates and air speeds. The critical run pressure loss is around 30-40Pa, with the main variation being on which valves are used. Flow rates have been kept low. I originally agonised over the choice of duct, but I am now satisfied with the choice. By all means, use me as an experiment and I will report back as to how the system has fared when completed. Given that I will be using the 125mm ducting into 125mm valves, does anyone have any recommendations that are a better solution than the Unifllex+ with the collar? (Always aware that it is hard to convey tone in written text: please read this in the best way possible 🙂 )

Have designed an MVHR system but am struggling with 1 detail. The design has 125mm insulated ducting by the time it reaches the ceiling/wall vents. Isodec/Sonodec to be specific. For the valves I need them: To accept 125mm semi rigid ducting with a good seal (using jubillee clip) To attach to plasterboard, ideally using spring clips/wings rather than screws. Smart looking (spouse approval factor) and that means flat looking valves. I would also like the extracts to have the possibility of adding filters to keep the majority dust/grease out of the ducting. I can't really find any products that fit the bill. The closest I can find are the Vent Axia Uniflex+ valves if used with the optional fixing collar but these don't have the option of extract filters and it doesn't look like the collar has a lot of depth for the duct to 'get on'. There is also a Zehnder Comfovalve which has a filter option but doesn't look like it would take semi rigid duct and a Nuaire Q-Aire valve which is similar. Has anyone else run into the same problem?