[TheForge] Something I've forgotten or worse yes I just imagine I once knew.

[Susan and Lynn Lang]

Mike
Go to  
http://www.engineeringtoolbox.com/natural-draught-ventilation-d_122.html


lynn

>Somewhere in the dark recesses I seem to remember a rule of thumb for
>guesstimating CFM of a flue.
>
>It was something like 2X ( cross section X Height)   So a 10ft stack
>with a 81 inch cross section would yield about 1600cfm .
>
>I believe this was for a gas or oil fire furnace. I am certain a wood or
>coal fire would have a different yield due to the lift supplied by the
>heat being greater.
>
>Anybody able to help me out?
>
>Mike Graf
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