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I think I know the answer but its best to double check. I am ordering ducting, plenums, etc and I wanted to check - is it OK to mix brands - e.g. I am finding that Zehnder plenums are cheaper and have better fixings than Ubbink. But I prefer simpler Ubbink plastic distribution boxes than larger modular Zehnder ones. Same with ducting, I prefer white Zehnder or Vent Axia ducting rather than yellow/green Ubbink as there are couple of places where ducting will be exposed (albeit only slightly above a built in wardrobe - so not obvious unless its bright green!). So can I just get the brands I want for different components and it'll all fit together? Or this is a bad idea?

Does adapting between round and flat ducting on main intake or extract create any issues? The way I was planning intake would have to go from round ducting from MVHR unit to flat ducting to get through the narrow gap in roof space and back to round ducting again to external vent. The overall area would remain roughly same - round duct is 160mm, flat is 300x80mm overall area remains at 0.02m2. But is changing the shape create additional problems around turbulence or others which would make this type of setup not suitable?

thats the one, where do I order them?

My MVHR unit is planned to be in loft space. As rooms are decorated, when I am running ducting into ground floor areas, I would be: - running it through bathroom wall partition (for kitchen/hall) - boxing it in behind bedroom wardrobes to reach living areas underneath This means that the duct run from loft to the ground floor ceiling vent is a straight vertical run. All off the shelf plenums appear to be 90 degree bends designed for horizontal runs. Are there any solutions for vertical runs like I describe above? Alternatively, I can add couple of 90deg elbows and connect elbow to plenum, thus straightening it out. That kind of seems inefficient though, 90deg elbow and 90 deg plenum so two bends for a straight run. My ceiling joists are 8 inches deep and I would be running 2x75mm ducts into each ground ceiling vent - not a great deal of room to play with.

Is anyone here familiar with Brink Pure Induct? Is there a restriction on installation orientation. I would like to install it vertically - looking at the manual, it doesn't say either way but video shows horizontal installation.

I have but other than going to specialist industrial suppliers, the standard domestic PIV units filtration is very poor. I guess I could pair up Brink Air Induct with a PIV of some sort, it may be another option but I would be on my own with support and figuring it out. In terms of airtightness, I have tried to make building airtight during renovation - its rebuilt from scratch internally - wet plastered, triple glazed glass units, insulation. I've not really worried about airtightness as such, but I imagine it would be pretty good. It certainly gets very very stuffy quickly with 6 people + dog and a cat.

Thanks for the response. I appreciate I am taking the risk here that it may not fix the issue, but its either this or move. If I was renting, we would be packing the bags right now :-). Some people locally have fitted various filtering units to varying degrees of success, so hoping to do the same. 1. On smells issue, that is the purpose of Pure Induct - it has both carbon and particulate filter - supposedly to clean room standard. I spoke to Brink about it and their tech guy uses it in his house to stop the log burner smoke coming in - swears by it (he would obviously). If anyone on here has one, would love to hear independent view. 2. Yes I doubled all the 75mm ducts to all downstairs areas for this reason (plus they are bigger rooms and more used) 3. Living areas are ground and 1st Floor, there is also a small basement area which gets quite damp.. 4. Thanks, I read the recommendations and worked out the runs to maximise air flow through the room. I have also accounted for the joists.

Hi all, I am looking to install MVHR in a house for a specific purpose not directly related to heat efficiency. We have a 1930s house fully renovated and finished, the area we live in unfortunately has out of control landfill very close by. This means we can't open doors or windows without getting smell of gas (and dust) coming into the house. So looking at installing MVHR as a way of letting clean air into the house. Based on the advice I had on here, I am planning to go with Brink Flair 400 unit. I worked out the area (145m2), volume (349m3) and planned out the ducting layout bearing in mind its a finished property with no previous provision for MVHR. I am still learning how to do the calcs as well as optimal layouts and understand I may have to compromise on ducting layout. I am also looking to pay someone for the design (or incorporate design into supply price). What I wanted to check is if my plan is generally doable or am I missing any critical points (and to estimate costs). What I am planning is follows: - Brink Flair 400 unit placed in cold loft attached to the rafters, plumbed with condensate drain - External inlet and outlets connected into loft eaves via 220x90 vents, 180mm insulated duct - Brink Pure Induct air filter connected to internal Flair supply via 180mm insulated duct - one 8-port Ubbink distribution box for supply side and separate 8-port Ubbink distribution box for extract side. - Ubbink 75mm flexible ducts on supply single run to each of 4 bedrooms, double run to 3 living spaces - Ubbink 75mm flexible ducts on extract, single to 2 bathrooms, double to landing, kitchen and basement - single Ubbink plenum in each area (11 rooms in total) - Lindab Airy Valves or similar in each room Questions: - Does above sound reasonable - have I missed anything obvious? - Does Flair 400 require any separate controlers or accessories not included into the unit price? - I know cold loft is not ideal, this was never planned. I planned all ducts as either insulated or on the warm side of the loft. Only exception is Pure Induct - its uninsulated and exposed. How likely is that to matter? (I could build insulated box for it). - Cost - I priced above based on ventilationland prices for Brink and it comes above 5.5k! I am still waiting for CVC to provide a quote for design & supply. I am a bit worried here, cost is already at high end of my expectation. I understand CVC are likely to be even higher, are there any obvious places I could cut back on costs (e.g. plenums or valves)? - one bathroom area is only accessible from below for the final part of run , I can push ducting into location from above but i can't fix plenum from above (its walled off). Are there any options for securing acessible ducting to the vent from below the ceiling level?

Thank you so much :-). This is perfect. I have actually asked CVC for a quote so I'll direct them to this unit. I have been trying to find a unit that fits too - the only unit I could find was Vent Axia but they were really difficult with giving me a quote which made me a bit reluctant to use them.

Thanks its a good idea and if it was a just a case enlarging the loft hatch I'd do it tomorrow :-). Trouble is the loft hatch is off centre to roof space and there is a purlin just above it. Even if I can squeeze it through the hatch by width, it needs to be 500mm deep to clear purlin. So I need to somehow get it to 700x500 pieces to get it up there :-). Its disassemble + reassemble (if thats even possible) or choose something different.

Like the title says - can a unit like Zehnder Q350 be disassembled and re-assembled easily? I'd like to install it in boarded loft space. Loft hatch is 700x700, unit is 850x720x570, I can't really make loft hatch bigger and I can't make a temporary hole in ceiling elsewhere due to joint spacing. My only option is to disassemble it, move it to loft in parts and then reassemble. Any ideas?