[TheForge] Forge Flue Rain Cap

[David E. Smucker]

My 15 inch flue (a culvert) has a 6 foot extension 1/4 larger than the flue. 
Of that 6 foot extension 1 foot is overlap.  So the amount above the flue is 
5 feet, or 60 inch or 4 times the diameter of the flue.  The industrial 
"rule of thumb" is 4 times the diameter of the stack.  This is not a new 
idea -- has been used on many industrial stacks.  In fact many old British 
chimney tiles or pots were made with a small rim or ledge on the inside near 
the bottom and some weep holes for the rain to drain out about the chimney 
cap itself.  They in fact might be greater than the 4 times rule in distance 
between the inside ledge and the top of the tile.
Mine works but I do get some rain down the stack but not very much.

Dave Smucker
----- Original Message ----- 
From: "April & Bill Clemens" <newky2 at dejazzd.com>
To: <theforge at mailman.qth.net>
Sent: Tuesday, December 14, 2004 10:52 PM
Subject: [TheForge] Forge Flue Rain Cap


> Looking for information on a "rain cap" for forge flues made by using a
> larger size pipe than flue.
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> Need details on how much bigger than flue, how tall, how is it attached?
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> Bill Clemens
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