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Found 6 results

  1. We are having MVHR installed as part of a new selfbuild project. The designer is proposing Zehnder Comfoair Q600 MVHR as per attached. The Zehnder Comfoair Q600 will be installed within the house as shown on the drawings We are having a cold roof with insulations at ceiling with 100mm across then 400mm over. Our questions are around air tightness and also not compromise on insulation. Do we need to run the ducts o the ceiling then run the 500mm insulation on top of the ducting? Any advise would be appreciated. Many thanks
  2. Our house, when built, was wired for a battery system, plus it had cabling installed for an emergency power supply (both of these cables sit redundant). We're at the stage now where we are seriously considering a battery and I'm looking at the Givenergy All In One battery system. The installation documentation for the All in One states "...minimum cable size requirements for the All in One are 6mm2 minimum" The existing unused battery cable is 4mm2 and the existing unused cable for the EPS is 2.5mm2. Running a new 6mm2 cable to the position needed would be virtually impossible so I asked the installer the stupid question, does 4mm2 + 2.5mm2 = 6.5mm2, in other words can I combine the two existing cables and use them as a parallel supply? To my surprise he didn't laugh at me but instead said he'd check with the manufacturer. This is the manufacturers response - a bit of a non answer "The wiring would have to be as per UK electrical Regs in terms of wiring and connections". The installer is going to check what they actually mean, but can someone help me here, is it lunacy to even suggest such a thing or is it safe/acceptable to parallel the supply with certain protections in place? Any guidance gratefully received.
  3. Apologies for making a topic just for a single question, did a search but can't find a decent answer. Sealing PVC ductwork... taking a look at the data sheets for the proprietary duct sealant products (e.g. Soudaduct), they just appears to be decorators caulk, with a little more flex. Has anyone just used caulk instead? In a domestic set up I can't imagine the sealant is under very much pressure. I would also be taping. Alternatively I could use general purpose silicone, which will seal anything.
  4. How do I go about drilling holes in my exterior walls for MVHR ducts (2x) to atmosphere? What tools should I use? How should I do it? Guidance, suggestions & tips most welcome! External walls (closed cassettes) OSB, 12.5mm, Smartply Propassiv – inside Empty cavity 240mm, to be later filled with blown-cellulose insulation. Studs every 600mm. Magply, 9mm – outside House warp: Tyvek Firecurb Ducts (2x) Ubbink 160mm (internal diameter) insulated ductwork External diameter: 192mm External cladding (not yet installed): Cedral lap planks (190mm, 30mm overlap), over treated battens. External wall terminals (x2):
  5. Installing coil in ducting Note that the condensation pipe still to be connected.
  6. 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
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