Jason L Posted January 18, 2021 Share Posted January 18, 2021 afternoon, for the MVHR system, what do you recommend for the external pitched roof terminals in plain tiles, to suit a 125mm ducts ? Link to comment Share on other sites More sharing options...
jfb Posted January 18, 2021 Share Posted January 18, 2021 Ubink do a bunch of different ones. http://www.ubbink.co.uk/products/Roofing/Roof-vents-terminals.aspx Link to comment Share on other sites More sharing options...
Jason L Posted January 18, 2021 Author Share Posted January 18, 2021 31 minutes ago, jfb said: Ubink do a bunch of different ones. http://www.ubbink.co.uk/products/Roofing/Roof-vents-terminals.aspx Cheers I’ll have a look Link to comment Share on other sites More sharing options...
Savage87 Posted January 23, 2021 Share Posted January 23, 2021 this is what you're looking for, ubbink ub16 https://www.ubbink.com/en-gb/product/ventilation-tile-hooded-universal-ub16-grey-black Link to comment Share on other sites More sharing options...
Jason L Posted January 23, 2021 Author Share Posted January 23, 2021 2 hours ago, Savage87 said: this is what you're looking for, ubbink ub16 https://www.ubbink.com/en-gb/product/ventilation-tile-hooded-universal-ub16-grey-black cheers, or something a bit prettier really ? is the ok for the supply air too ? Link to comment Share on other sites More sharing options...
Savage87 Posted January 24, 2021 Share Posted January 24, 2021 yes, I have it for both supply and exhaust, you can also get some that sit flush, but you need to make sure there's enough air coming through, as there are some that are not suitable for mvhrs. If I remember correctly you need at least 10000mm2 clearence in the vent for 125mm ducting. Link to comment Share on other sites More sharing options...
Jason L Posted January 24, 2021 Author Share Posted January 24, 2021 35 minutes ago, Savage87 said: yes, I have it for both supply and exhaust, you can also get some that sit flush, but you need to make sure there's enough air coming through, as there are some that are not suitable for mvhrs. If I remember correctly you need at least 10000mm2 clearence in the vent for 125mm ducting. ok thanks for your help cheers Link to comment Share on other sites More sharing options...
Andrew Sharratt Posted January 26, 2021 Share Posted January 26, 2021 I am also considering these Ubbink for my 150mm inlet and exhaust. Since they will be through the roof how do you cope with 1. Access for cleaning the inlet grill? Do you fit some internal filter? 2. Making the ducting slope downwards to allow condensation to run out? Is there another way to stop moisture running back into the MVHR unit? I cant see how either of these 'best practice' design features can be achieved with roof vents. Additionally, does anyone have experience of these Ubbink cowls in very windy locations? Thanks Link to comment Share on other sites More sharing options...
JamesP Posted January 26, 2021 Share Posted January 26, 2021 18 minutes ago, Andrew Sharratt said: I am also considering these Ubbink for my 150mm inlet and exhaust. Since they will be through the roof how do you cope with 1. Access for cleaning the inlet grill? Do you fit some internal filter? 2. Making the ducting slope downwards to allow condensation to run out? Is there another way to stop moisture running back into the MVHR unit? I cant see how either of these 'best practice' design features can be achieved with roof vents. Additionally, does anyone have experience of these Ubbink cowls in very windy locations? Thanks No knowledge of Ubbink but I recently removed the inlet grill to fit cedar cladding and quite surprised at the amount of rubbish in the grill. This was after only 8 months. So access for cleaning quite important. 1 Link to comment Share on other sites More sharing options...
Jason L Posted January 26, 2021 Author Share Posted January 26, 2021 23 minutes ago, Andrew Sharratt said: I am also considering these Ubbink for my 150mm inlet and exhaust. Since they will be through the roof how do you cope with 1. Access for cleaning the inlet grill? Do you fit some internal filter? 2. Making the ducting slope downwards to allow condensation to run out? Is there another way to stop moisture running back into the MVHR unit? I cant see how either of these 'best practice' design features can be achieved with roof vents. Additionally, does anyone have experience of these Ubbink cowls in very windy locations? Thanks I'm guessing that some sort of filter can bit fitted on the intake, before the MVHR unit, which is accessible for cleaning but i have not seen anything on it, hopefully someone else knows ? Link to comment Share on other sites More sharing options...
PeterW Posted January 26, 2021 Share Posted January 26, 2021 33 minutes ago, Jason L said: I'm guessing that some sort of filter can bit fitted on the intake, before the MVHR unit, which is accessible for cleaning but i have not seen anything on it, hopefully someone else knows ? Yep search duct filter housing 1 Link to comment Share on other sites More sharing options...
Russdl Posted January 26, 2021 Share Posted January 26, 2021 @Jason L We used this style of cowl vent, clearly no use on a roof but may be there is something similar somewhere that would work on a roof? I think they are similar to @JamesP's but with a much coarser mesh. The coarse mesh will probably let lots of rubbish through, so minimising external cleaning requirements. I made a 'pre filter' just prior to the MVHR to catch that rubbish. The pre filter also allows access to the back of the cowl so I can clean it from inside the house. My pre-filter is probably over large and it turns the airflow through 90° but I reckon something much more compact could be knocked up as an in-line filter. Provided it was big enough to get an air line in you could blow all the crap of any external mesh from within. 1 Link to comment Share on other sites More sharing options...
Andrew Sharratt Posted January 26, 2021 Share Posted January 26, 2021 Thanks for the ideas for an inline inlet filter. How about the condensation? How do you stop moisture running down from a roof vent? Link to comment Share on other sites More sharing options...
Jason L Posted January 26, 2021 Author Share Posted January 26, 2021 27 minutes ago, PeterW said: Yep search duct filter housing Cheers that was easy. do you need to be careful what filter material is used to so not to reduce air flow ? Link to comment Share on other sites More sharing options...
Jason L Posted January 26, 2021 Author Share Posted January 26, 2021 24 minutes ago, Russdl said: @Jason L We used this style of cowl vent, clearly no use on a roof but may be there is something similar somewhere that would work on a roof? I think they are similar to @JamesP's but with a much coarser mesh. The coarse mesh will probably let lots of rubbish through, so minimising external cleaning requirements. I made a 'pre filter' just prior to the MVHR to catch that rubbish. The pre filter also allows access to the back of the cowl so I can clean it from inside the house. My pre-filter is probably over large and it turns the airflow through 90° but I reckon something much more compact could be knocked up as an in-line filter. Provided it was big enough to get an air line in you could blow all the crap of any external mesh from within. Cheers. I have looked there are pre made pre filters for the ductwork maybe I can put it close to the roof vent as suggested. Cheers Link to comment Share on other sites More sharing options...
Jason L Posted January 26, 2021 Author Share Posted January 26, 2021 40 minutes ago, Andrew Sharratt said: Thanks for the ideas for an inline inlet filter. How about the condensation? How do you stop moisture running down from a roof vent? I guess if it’s just below the roof vent it won’t get condensation above it. Link to comment Share on other sites More sharing options...
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