Concentric Flue & Wind

[megawatt]

Hi all,

I'm curious ... What stops the wind blowing down these newer types of concentric flues and blowing the gas out?

You've guessed that I'm not a Corgi RGI

Older terminals had a solid face in front of the outlet running parallel to the outside wall so the wind couldn't blow straight down the flue.

These newer ones don't and I have a morbid curiosity to know why it all works

MW

 

[baxpoti]

A fan that's stronger than the wind!

 

[corgiman]

and you dont have (on most modern ones) the problem of a pilot light either

 

[asc]

The area of the inner and outer section are very similar, the outer part is the inlet, the inner part is the outlet. If the boiler fan is not running the wind forces against the inlet and outlet equally, so there is no actual flow of wind through the boiler (unless there is a leaking seal on the boiler). Simlarly when the boiler is running, any wind equally pressures the inlet and outlet, so the fan runs as normal. They used to be more commonly known as balanced flues.

 

[megawatt]

I'm impressed with the simplicity and it obviously works

Thanks all

MW