Olly P Posted May 29, 2020 Share Posted May 29, 2020 We're half way through building the shell for our 430sqm dormer bungalow. Now after designing/altering and studying the plans countless times I've just realised that having the plant room to the front of the house may not be ideal in terms of external aesthetics, although for MVHR it is on the north side of the house so performance in summer will be better. So I'm looking for any pictures of external wall exhaust/intake vents so I can try and get my head around how I can make them look ok. Or, I'm wondering would it be possible to run them to roof terminals? The same issue will be for the gas boiler. In hindsight I should of located the plant room on another elevation but the layout wouldn't of worked as well. Link to comment Share on other sites More sharing options...
ultramods Posted May 29, 2020 Share Posted May 29, 2020 I wish I had put mine on the roof, far more discreet and won't have water streaks form below the vents, compared to wall mounted ones. I thought the kit I had ordered had to roof vent's, however when the roofer asked for them I realised I didn't have them and he would wait for them, so I put vents on the gable Link to comment Share on other sites More sharing options...
Declan52 Posted May 29, 2020 Share Posted May 29, 2020 I connected mine to a roof tile vent. Link to comment Share on other sites More sharing options...
CC45 Posted May 30, 2020 Share Posted May 30, 2020 https://www.bpcventilation.com/exterior-grille-s-steel-louvered-cowl Link to comment Share on other sites More sharing options...
Gone West Posted May 30, 2020 Share Posted May 30, 2020 4 hours ago, CC45 said: https://www.bpcventilation.com/exterior-grille-s-steel-louvered-cowl The only problem with those is that they cause a significant restriction to flow. I bought a couple and gave them away for that reason. Link to comment Share on other sites More sharing options...
BMcN Posted May 30, 2020 Share Posted May 30, 2020 2 hours ago, PeterStarck said: The only problem with those is that they cause a significant restriction to flow. I bought a couple and gave them away for that reason. What did you use instead? These are what BPC supplies witg my MVHR and I'm in the process of installing. Link to comment Share on other sites More sharing options...
Gone West Posted May 30, 2020 Share Posted May 30, 2020 (edited) 59 minutes ago, BMcN said: What did you use instead? These are what BPC supplies witg my MVHR and I'm in the process of installing. I made some. The inflow to the MVHR should have the lowest flow restriction of any of the ducting. I have 125mm diameter ducting and in order to maximise flow into the unit I used 45 degree bends and a short pipe run. The vent I made was 230mm square and by using a grille and insect screen of that size I got slightly better flow area than the ducting. IIRC I used 2mm or 2.5mm stainless steel woven mesh for the insect screen. Some of the mesh companies give flow rates for their different products. Edited May 30, 2020 by PeterStarck Pressed the wrong button. 1 Link to comment Share on other sites More sharing options...
dpmiller Posted May 30, 2020 Share Posted May 30, 2020 Dunno if the picture is accurate for the BPC item, mine don't have louvres and have a 10mm or so wire grid. Link to comment Share on other sites More sharing options...
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