Extractor fan air brick extraction

[Master321]

Hi,

I'm trying to decide how to best site extraction vents from an understairs loo and a downdraft extractor on a kitchen island. It's a terrace so everything needs to vent to the rear.

The only route for the ducts inside the house is underneath the floorboards, therefore I'm planning to vent using air bricks just above the DPC.

The issue I have is that over 70 percent of the back wall is a door. The two existing air bricks to ventilate under the floor are within the remaining 30 percent.

Is there any reason for the loo and kitchen not to vent underneath the door?

Thanks for any advice!

 

[JohnW2]

The only route for the ducts inside the house is underneath the floorboards, therefore I'm planning to vent using air bricks just above the DPC.

I'm not sure about your kitchen island but, in the case of the under-stairs loo, I would have thought that the most common route would be above ceilings (after a bit of joggling under the stairs!), rather than below floors. Odours tend to rise, so if the vent in the loo is low down (if that is your intention), it could have the effect of drawing those odours down to a part of the room where they were more noticeable!

Kind Regards, John