Green Building Bible, Fourth Edition |
![]() |
These two books are the perfect starting place to help you get to grips with one of the most vitally important aspects of our society - our homes and living environment. PLEASE NOTE: A download link for Volume 1 will be sent to you by email and Volume 2 will be sent to you by post as a book. |
Vanilla 1.0.3 is a product of Lussumo. More Information: Documentation, Community Support.
Posted By: adamsmithWe are about to have our first airtight test done, if the results are good we would like to go ahead with MVHR self-installation.Hello. Good luck with the test. What stage is the build at?
Does anyone have any particular radial systems they would recommend? Due to us having limited space it does need to be a radial system.I'm very happy with our Ubbink system using the AE35 ducts and a previous generation of their distribution boxes. We have a Brink Renovent Excellent MVHR unit but the duct system will work with other units. I liked that the ducts were easy to feed through our metal web joists, and easy to set up and plug together at both ends. The flow restrictors on the distribution boxes make everything very simple. The biggest grief is wrangling all the ducts into one place to connect them to the distribution boxes.
Also are there any design principles that need to be followed I’m thinking based on my current understanding:The basic principle is extract from all 'wet' rooms and supply to all 'habitable' rooms. You get to choose which e.g. a plant room is maybe based on how the system balances. You'll need an extract in the kitchen and a supply in the living/dining area. You'll need a supply in bedrooms and extract in the en-suite. The MVHR system designer will calculate flow rates and number of terminals etc (Companies like CVC Direct offer this service). The general idea is to put the terminals as far from the door as possible. Don't forget you need undercuts (or hidden overcuts) on all doors. And obviously you won't want all the extractors if you're going for airtight + MVHR.
• Extraction only for (WC, ensuite, and bathroom)
• Supply only for small rooms (study, living room)
• X2 supply and extraction for 60m2 kitchen/ lounge/ diner
• X1 supply x1 extraction in the largest master bedroom
• X1 supply for medium size bedrooms
Posted By: adamsmithThe unit is going under the eves next to the main bathroom upstairs, duct runs through the first-floor joists/ eves/ small loft space above the rafter ties.Sounds good. Don't forget you'll need easy access to the MVHR unit to clean or change the filters every few months. What type of joists do you have? - if they are solid it will be quite difficult to route ducts through them. You'll also need significant space for the distribution boxes and all the ducts around them.
Posted By: cjardTake the opportunity to install a central vacuum system alsoIf you're asthmatic it's no doubt a very good idea. But otherwise why lug around a coil of hose around when you could use a rechargeable (or robot) vacuum instead?
Posted By: adamsmithThe unit is going under the eves next to the main bathroom upstairs, duct runs through the first-floor joists/ eves/ small loft space above the rafter ties.You generally need good access to the unit, a big door that opens so beware! Also, it does produce some noise that may be noticeable close to a bedroom at night.
Posted By: Dominic CooneyThe one thing I would have done differently is put the supply vent to each bedroom higher up the wall or even on the ceiling. They are about halfway up the wall, which I thought would be fine and made it a hell of a lot easier for me in terms of installation (it meant that I didn't have to get past a chord in the roof timbers), but now that it is finished and the beds are in place they have ended up a bit too low down the walls.All our upstairs bedrooms have the vents in the floor (under the bed in one case :). So the duct just runs amongst the joists and terminates in a box in the same space. The extract vents in the wetrooms are mounted in the internal stud walls, about 2.3 m off the floor. In the plant room I didn't actually fit a vent/terminal, I just brought the duct out into the space and used airtightness tape over the end to adjust the opening to the correct m³/hr.
Posted By: djhvents in the floor
Posted By: djhThe idea of having both intake and exhaust together but separated on the same wall (or both on the roof) is to balance dynamic pressures when the wind blows. So both experience the same additional pressure, or the same reduced pressure, and thus the MVHR doesn't really notice and doesn't have to draw extra power for its fans.
Posted By: GreenPaddythe intake should have a leaf/insect meshI have a wire guard to prevent birds, but the larger crap was drawn in, hence my additional pre-filter which works really well (but filter needs replacing 3-4 times a year).
Posted By: borpinSame here. I didn't want an insect mesh on the intake (or exhaust) because then I would somehow need to clean it regularly, so I have a washable g3 filter at the MVHR intake that collects all the insects.Posted By: GreenPaddythe intake should have a leaf/insect meshI have a wire guard to prevent birds, but the larger crap was drawn in, hence my additional pre-filter which works really well (but filter needs replacing 3-4 times a year).
1 to 22 of 22