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  1. Any help/comments on the MVHR design greatly appreciated We have just ordered Zehnder Comfoair Q350, 90mm radial ducts, 160mm spiral and insulated ducts (split order: 80% BPC / 20% VentilationLand & phstore). MVHR unit will be located at the ground floor utility/laundry room. I received two quite different Location Guides from BPC. The first one was initially done for the 75mm radial ducting by an error but then no change in the guide when we pointed this out; the second one for the 90mm ducting after asking some additional questions regarding the number of double duct valves (in return they changed the design). Both guides show two separate exhaust/supply external terminals but this will be changed to Zehnder 160mm combo-grille (drilling openings vs building construction issues, plus wouldn't want the terminals on two different walls anyway). I also received some calculations from PAUL for the Zehnder unit and 90mm system, with the number of supply/extract points indicated in the table below (the quote was well out of our budget though so have not got the full design from them). Which one out of the three would you describe as the most suited? Can any obvious errors be seen in the valves placement, folks? 1. BPC Ground floor (left hand side drawing) has red extract points in 2x utility, 2x shower room, 2x kitchen; green supply points in 2x living area (dining area via cascade effect?), 1x bed/study Upper floor extracts: 2x bathroom, 1x in each bedroom 2. BPC re-designed Ground floor: extracts - 1x utility, 1x shower room, 2x kitchen; supply valves - 2x living area, 1x bed/study, 1x hallway Upper floor: extracts - 1x bathroom, 1x hallway; supply valves - 1x in each bedroom 3. PAUL calcs for 90mm ducting system and a different approach to the valves' number/ location (see the right hand side column for this) - no valves in the hallways at all, 2x extract valves in the upper (main) bathroom, and 2x supply point in the "master" bedroom (although it is slightly smaller in area than the other two upper floor bedrooms and much closer to the unit).
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