HRV external vents

dos29

Currently at roofing stage, and haven't settled on one HRV company in particular.
But.... I'm trying to make sure I don't have to go ripping slates just to hook up intake and output pipes.
So, can anyone tell me is it a standard size vent slate that they all use, or do companys use specific ones for they're units?
Thanks for any help.

kboc

what about through gable wall?

dos29

kboc wrote: »

what about through gable wall?

To be honest, I was under the impression that the preferred way was through the roof.

dos29

So is there a train of thought on where is best to position vents for HRV?

bakerbhoy

Mine are through the gable wall. Roof wise you are increasing the chance of leaks

exaisle

Ive used opposing gable walls for input and output.

Input comes from south facing, output goes to north facing on the basis that south facing might be slightly warmer....

JuniorB

+1 for gable - less grief.

gears

What about through the fascia and soffit?

MicktheMan

dos29 wrote: »

Currently at roofing stage, and haven't settled on one HRV company in particular.
But.... I'm trying to make sure I don't have to go ripping slates just to hook up intake and output pipes.
So, can anyone tell me is it a standard size vent slate that they all use, or do companys use specific ones for they're units?
Thanks for any help.

I'm assuming the reason you're choosing a hrv system is to move away from the old style "hole in he wall" natural vents. Then it stands to reason that the hrv system you choose should be designed to deliver the best efficiency for your home. The duct layout scheme and hrv unit location plays a large role in the effiency of the overall system. I therefore advise you to nail down your supplier and have them design the optimum layout for your home and let this then dictate the location of the vents.

CJhaughey

I have a dual exhaust/intake box in my gable. You can use roof vents but they are small diameter and you will likely need at least 2 to allow proper flow.
I used roof vents for the kitchen extractor but for the HRV it was simpler and neater to just run the two ducts through the wall in the same place.
Make sure you have good access to the intake, a properly designed intake should also have some kind of insect mesh on it.

dos29

Appreciate all the comments folks.
First time managing an entire house build, so some mistakes are going to be made along the way. There's only so much that'll fit into this fat head of mine.
I have done quite a lot of research into HRV systems, but havn't nailed my colours to any particular mast just yet. Thought I had more time before making the decision. Then all of a sudden, as the roof is being felted, I realise its better to get slate vents in now (if needed) than to be ripping up slates at a later stage.
Going through the gable seems like a handy solution, but the way my upstairs is divided, it has the bathroom in the middle, with bedrooms on either side by the gables. I fancy positioning the unit over the bathroom to reduce any possible excess noise going to bedrooms, and more importantly to reduce the runs of ducting through the studs to the downstairs rooms, and use slate vents to minimise the runs from the unit to the vents.
To me, this means the slate vents make more sense. So, at the moment, I'm trying the local builders providers tomorrow to get two 150mm slate vents, and have them located on the rear slope, with 3mtrs between them.
Worst case scenario, the HRV schematics change, I end up with vents through the gable, and 2 surplus slate vents in the roof that will do no harm.
Thanks again for all comments.