Basement ventilation

How i run the duct into the wall as the top half of duct would be above my ground floor joists and flooring and the bottom half below it? Looking at the pic above the top of ducting would be inside my living room?

you mean your floor is below ground level

well, the outside ventilator has to be above ground, and the inside has to be below the floor.

the duct can be built into the wall, it is about brick-sized. You will have to take out several bricks to build it in.

if the pavement is up against the front of your house I suppose it would be difficult for you to dig a pit outside where there used to be one above the cellar windows. But at least you can do that at the back of the house.

look for the least inconvenient place, e.g under stairs, beside front door, in a corner where you can box it in.

post some photos, that may spark off ideas.

Thanks for your help JohnD,

Here are some pics.


The last one shows the cover which leeds to the original window/airbrick.

Yeah, my living room floor is about 3 inches below the outside ground level.

I bet those two replacement slabs were put over the old light well to the cellar windows. I bet there used to be an iron grille that has been filled up. You might still see it on other houses of similar age. I wonder if you could dig it out again.

It is already dug out under the slabs, thats where all the water builds up and causes the dampness under the internal air brick.

I was thinking, dig it out , put in a bigger iron grill to allow better ventilation, shape or drain the hole underneath so water does not pond against the wall.