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Old 11-30-2009, 06:54 AM
fornax hominus's Avatar
Laborer
 
Join Date: May 2009
Location: ottawa valley canada
Posts: 95
Default how much room do I leave under the chimney cap?

Having started my MarkII oven a year and a half ago [and cooking in it steady for a year] I am now slowly getting the ''extras'' seen to , still no roof, but I put in a chimney before the heavy frosts . I welded up one from 12ga.steel 9''x29''x24''high. [inches]
I put it sitting above the oven arch with a 3'' smoke shelf to the dome side, and it's working great , but I want to put a cap on and am wondering as to the distance above .. I have been advised [by a woodstove designer] to put a 1inch steel band bisecting this space [to prevent cross winds from downdrafting] like most new woodstove chimneys . Is there a standard formulae for this?
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Old 11-30-2009, 07:55 AM
Journeyman
 
Join Date: May 2009
Location: Detroit
Posts: 383
Default Re: how much room do I leave under the chimney cap?

In a round stack it is 2/3 the diameter. Not sure about a rectangular but I will look into it for you tonight.
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