Stack draft stabilizing device
AssigneePerform, Inc.
InventorLawrence C. Patton
Life of this patent
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Abstract
The present invention involves a draft stabilizing device mounted at the exit end of a draft vent or stack. The device is constructed from first and second cap members made in the form of open-bottomed cones which are substantially broader at their bases than they are high. The cones are joined together at their edges with their axes aligned. The lower cone has a large stack inlet opening at its apex which is connected to a stack. The lower cone also includes a plurality of outlet openings around its periphery. The area of the outlet openings exceeds the cross-sectional area of the stack.
Claims8
A device for mounting at the exit end of a draft stack having a specified cross-sectional area to stabilize draft flow from the stack against the effects of ambient wind conditions, comprising:
- a first cap member in the form of a concave surface, said surface having a peak angle substantially between 130.degree. and 170.degree.;
- a second cap member in the form of a concave surface, said surface having a peak angle substantially between 130.degree. and 170.degree., said second cap member having substantially the same base size and shape as and being joined to said first cap member at the edges of their respective bases, said second cap member further having
- a plurality of outlet openings through its surface near the edge where the first and second cap members are joined together, said outlet openings lying below the edge joining the first and second cap members and having an aggregate area not less than the specified cross-sectional area of the stack and said outlet openings further being unshielded against winds travelling substantially parallel to the plane at which the edges of the respective bases are joined;
- and
- a stack inlet opening where its peak would be located, which opening is substantially the same size as the specified cross-sectional area of the stack;
- and
- means for connecting said stack inlet opening to the exit end of said stack.
Dependencies are inferred from the claim text.