Cellar ventilation ground level coal chute

[mordzy]

Am I right in thinking the suggestion is a 2 pipe system? One with a fan ‘pushing’ air out of the cellar and another pipe that is ‘passive’. When I was googling I’d seen something similar a while back. I think internally one pipe was longer, something to do with colder air being lower so falling in from outside?!

Like the attached

 

[mordzy]

Had a few builders look at it and got mixed opinions and wildly different quotes. So I decided to have a go myself. Just to help anyone else that’s a bit stuck.

Cost me £30.
-£10 for a plastic periscope vent off eBay with 2 vents (one for testing)
-£20 for sand/cement, bucket and a trowel

I basically decided to pull some stone out above the chute. I’d looked underneath from the cellar and noticed the floor slabs stopped about 6” before the outer wall skin.

The periscope vent I got was much deeper than I could go into the wall cavity. I think the vent cover is supposed to act as the hair brick. I had to improvise and modify the vent by cutting off a good inch so that it would fit in the gap I had.

After removing a few stones I just wedged in the plastic periscope top half and cemented round with some stone I’d smashed to size. I bridged above and below the plastic vent with some flat steel bar I had as I thought it might warp otherwise.

I then just built up a wall on the coal chute to the top so it’s all sealed. I need to think about how to cover the hole properly and off to back fill the chute or not.

Appreciate any further advice or comments.