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Showing results for tags 'semi rigid'.
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Hi Folks So i am about halfway through my MVHR install, using 92mm semi rigid ducts from Hybalans. Does anyone know if the Ubbink ducting usually listed as 90mm is actually the same? The fiitings all look very similar, and I would have thought that there are not that many actual manufactures of the ducting. I purchased tow50m rolls and thought it would be enough, wrong! I need approx 40m more, and the Ubbink stuff is circa £160.00 per 50m roll, versus the HB+ at circa 275.00 so quite a saving. Anyone any tips on using EPP 180mm dia ducst for the initial input and exhaust from the unit/ Thanks Andy
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Apologies if this is a silly question but I can't find anything regarding the use of differing duct sizes on the site. The majority of rooms in our house require a single run of concealed 75mm semi rigid duct to satisfy building reg extract rates whilst keeping velocity low enough to minimise noise - at least in theory. Our kitchen/lounge/diner is larger and has a vaulted ceiling with a volume of 214m3 which is considerably more than anywhere else in the build. My calculations show the room needing 150mm diameter (or similar) ducts. This isn't an issue as we plan to use exposed galvanised in this space however I'm a little unsure if it is OK to mix duct sizes on a system or will it cause problems? Flow velocity at the outlets can be balanced in theory to within 1/2ms of other but the smaller rooms have an ACH of 2-3 whereas the largest room is 0.4. Is having such a varying range for this also an issue? Many thanks
