[TheForge] Stack Cover

[Riverbend Blacksmiths]

Thanks all!! Clear as mud. I'll give it a try.
---
Marsha.
Ontario, Canada

On Nov 22, 2006, at 6:46 PM, David E. Smucker wrote:

> What Darrell describes is what I call a "Shot Gun" stack cover.   
> Not really a cover at all but a way to limit rain coming down your  
> stack and present zero back pressure so you get maximum draft.   
> This is now a common industrial stack cover or top.  It works  
> because, very little rain falls straight down -- when it rains the  
> wind is blowing so rain is falling at an angle.  The stronger the  
> rain, the high the wind in most cases.  The stack top consists of a  
> larger diameter section of stack that fits over the normal size and  
> is shimmed out so that there is space for water to drain out and  
> flow to the roof and not down your stack to the forge.  The rain  
> traveling at an angle strikes the side of this larger extension and  
> run down the inside and out the annular space and on to the roof.   
> Rule of thumb is to make this stack extension 4 times the diameter.
>
> Why go to this trouble -- because a common hat type stack cover  
> creates so much back pressure that it typically cuts the effective  
> draft in half.
>
> My stack is 15 inch diameter and my "shot gun" extension (100  
> percent open at the top) is 16 inch diameter.  It extends 60 inches  
> above the 15 inch stack and overlaps by 12 inches so it total  
> length is 72 inches.  It works very well.  It doesn't suck your hat  
> off, but I don't have smoke in the shop either. (This on a hood  
> type forge not a side draft.)  With light rain I get a little water  
> down the stack, with heavy rain I get almost none.
>
> Look for a future article on this in the AACB Newsletter.
>
> Dave Smucker
>
> ----- Original Message ----- From: "Riverbend Blacksmiths"  
> <riverbendblacksmiths at mac.com>
> To: "Sponsored by ABANA" <theforge at mailman.qth.net>
> Sent: Wednesday, November 22, 2006 4:35 PM
> Subject: Re: [TheForge] Stack Cover
>
>
>> I too just finished installing a stack (an 8" black stove pipe)   
>> through the steel roof of my shop. It connects down to a thick  
>> sheet  metal chimney that I built and welded up in the shop. It  
>> draws very  nicely from the side (side draft). I bought an off-the- 
>> shelf cap that  fit the diameter of my 8" pipe, but would like  
>> some input from others  in the forum to see what's best. We had a  
>> lot of rain and driving  winds, so there was a nice puddle in my  
>> coal ash bucket after the  rains that drained on through.
>>
>> I'm sorry, but I can't understand or picture Darrell's directions   
>> that he provided here. Am I the only one?
>>
>> Marsha.
>> Ontario, Canada
>> -----
>> On Nov 22, 2006, at 11:59 AM, Darrell wrote:
>>
>>> A 4' section of 14" diameter pipe over the top of your stack  
>>> would  work the best. Attach the section overlapping the top of  
>>> your stack  a couple of inches using three one inch channels  
>>> spaced around the  stack. Rain that enters the top of the 14"  
>>> piece will hit the side  and fall out the gap at the bottom of  
>>> the 14" piece onto the roof.
>>>
>>> Darrell
>>>
>>> ----- Original Message ----- From: "Lynn and Susan Lang"  
>>> <langfarm at together.net>
>>> To: <theforge at mailman.qth.net>
>>> Sent: Wednesday, November 22, 2006 5:38 AM
>>> Subject: [TheForge] Stack Cover
>>>
>>>
>>>> Hello
>>>>
>>>> What turns out to be the best cover for the forge stack?
>>>>
>>>> Want to keep rain and snow out but allow smoke out...
>>>>
>>>> I put up a 12" pipe, told that anything smaller will not be   
>>>> adequate...
>>>>
>>>> Thank you
>>>>
>>>> lynn
>>>>
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