deejay123
Well-Known Member
Hi guys,
Hope you are all good?
I have a bit of an issue with my ventilation at the moment. I’ve currently got a 4m2 room within the new loft space.
If you can imagine it’s a plasterboarded room within a room so it’s well sealed off which allows for negative pressure.
My set up is a gavita CT2000e led fitting with 2 G.A.S revolution silenced V2 fans (1x8 inch for extract & 1x 6 inch for intake) I’ve come to find that the intake when it’s on doesn’t really give the room neg pressure, so I’ve just unplugged it and it’s dragging air in from the vent now which is really annoying although I’m not sure if the intake fan is a bit overkill anyway?
Everything is controlled off the Gavita master EL2F controller.
Its holding temps really well (controller says 27% power for extract) but there’s an issue with my exit point for my ventilation.
I’ve had to cut some brick out in the chimney to allow for the air to escape.
Ive added a 150mm 90° bend which directly goes upwards to the exit point.
Its not too bad currently why the fan is only on 25-30% but when it rises to over 60% you can feel the air blowing back in the room, I presume it’s hitting the top of the roof and bouncing back down?
Has anyone else had this same problem? The chimney cowl on the roof I think is 100mm.
The extract goes from 200mm to a 150mm 90° reducer so I think that’s why the air isn’t escaping quick enough at the top.
The only thing I think that would work is making the cowl on the roof 150mm and running a ducting down to the bend but this will be a massive headache and would need a roofer etc…
I’m just thinking to block the hole up instead (in the pic) do you think that would be ok? The hot air would rise anyway?
Other pic is the exit point at the top, doesn’t look like it but it’s definitely dragging air up the chimney.
Any help with possible suggestions would be massively appreciated!
Thanks
Hope you are all good?
I have a bit of an issue with my ventilation at the moment. I’ve currently got a 4m2 room within the new loft space.
If you can imagine it’s a plasterboarded room within a room so it’s well sealed off which allows for negative pressure.
My set up is a gavita CT2000e led fitting with 2 G.A.S revolution silenced V2 fans (1x8 inch for extract & 1x 6 inch for intake) I’ve come to find that the intake when it’s on doesn’t really give the room neg pressure, so I’ve just unplugged it and it’s dragging air in from the vent now which is really annoying although I’m not sure if the intake fan is a bit overkill anyway?
Everything is controlled off the Gavita master EL2F controller.
Its holding temps really well (controller says 27% power for extract) but there’s an issue with my exit point for my ventilation.
I’ve had to cut some brick out in the chimney to allow for the air to escape.
Ive added a 150mm 90° bend which directly goes upwards to the exit point.
Its not too bad currently why the fan is only on 25-30% but when it rises to over 60% you can feel the air blowing back in the room, I presume it’s hitting the top of the roof and bouncing back down?
Has anyone else had this same problem? The chimney cowl on the roof I think is 100mm.
The extract goes from 200mm to a 150mm 90° reducer so I think that’s why the air isn’t escaping quick enough at the top.
The only thing I think that would work is making the cowl on the roof 150mm and running a ducting down to the bend but this will be a massive headache and would need a roofer etc…
I’m just thinking to block the hole up instead (in the pic) do you think that would be ok? The hot air would rise anyway?
Other pic is the exit point at the top, doesn’t look like it but it’s definitely dragging air up the chimney.
Any help with possible suggestions would be massively appreciated!
Thanks
