Adamiscold wrote:I know mine would be high enough for code going 4' above the roof line on my flat rubber roof. But it's only going to be about 8' total height going straight up in one shot. It seems like it should work and without any issues, nothing near it to effect the wind flowing across the top of the chimney.
Here's my "layman's" understanding of how a chimney works:
Warm air rises
As the warm air rises it expands
Trapped within a chimney's walls, this air expansion is "squeezed" & since it wants to expand (but is prevented from doing so) it increases it's velocity upward to escape it's bounds
This increase in upward velocity creates a vacuum below the upward rushing air.
Since nature abhors a vacuum, it (nature) fills it (the vacuum) by sucking the exhaust out of the fireplace/stove/furnace
The higher the chimney, the greater the upward air velocity & vacuumThus, we have Draft!
Any engineers out there wanna critique my analysis? So the question is: Is there a minimum height necessary to achieve this chimney effect, & if so.......how does one formulate it?