A2 rated new build - cold air coming in the kitchen extractor fan

esc123

Hi,

Not sure this is the right place for the question. As described in the title we have a brand new house A2 rated and is nice and warm with Air to Water heat pump. But since the temperature has gone down Ive noticed a cold draft around the extractor fan. Is this as expected? It seems crazy that with all the insulation that we just have a hole in the side of the house letting air come in freely through the fan into the kitchen.

I have no clue about such things but I searched this problem and found others suggesting a Manrose Cowl Vent (https://www.screwfix.ie/p/manrose-cowl-vent-white-100-x-100mm/16195) for bathroom vents with the same problem. I've no idea what this thing does so I'm going to need to do more research.

But in the mean time can anyone give any input into whether a) this is normal/expected for a kitchen vent? and b) if not what can be done to stop the cold air from coming in?

Cheers!

munsterfan2

Hi,

We put one of these in, seems to help https://munsterdiy.com/products/150mm-airtight-cooker-hood-damper-kit-blower-door-certified

esc123

https://www.boards.ie/discussion/comment/121368324#Comment_121368324

Thanks! Did you install that yourself or did you need to get someone in to do it? Does it completely stop the cold draft coming in through the extractor fan?

munsterfan2

The builders put it when installing the hood, but it was very straightforward. If we get an all out gale blowing directly at that wall is can click open but generally no breeze

Padre_Pio

There should be a plastic one-way flap, but it sounds like it's missing.

Yellow_Fern

https://www.boards.ie/discussion/comment/121381081#Comment_121381081

You can cheap flaps widely but dont cheap out on this. A good airtight model is worth it