The invention relates to a chimney flue with ventilator means.

Most houses today have both a chimney flue and one or more separate vent pipes covered by cowls for venting ⁵ air from rooms where ventilation is desired, either by natural draught or mechanical ventilation.

It is previously known to provide chimney flues with an extra duct for ventilation purposes. Such extra ducts were often used earlier for -ventilating laundry rooms.

10 When there is snow on the roof, the warm air vented through the ventilator cowls causes the snow around the cowl to melt. When the melted water runs off away from the cowl it may freeze to ice. Eventually, as the heated air passing through the ventilator cowl melts more and more

15 snow, a mound or patch of ice may form which can damage parts of the roof gutters on the house, and/or water may collect in front of the ice mound and penetrate the roof, often at the location of the ventilator cowl. If water goes through the roof it will cause damage to the underlying

20 wood, insulation and interior ceilings.

In addition to the problem of roof leaks and ice build-up associated with the use of ventilator cowls, such ventilator cowls are also costly to buy and expensive to install. They also require regular maintenance. ⁵ Another drawback of ventilator cowls is that their presence makes for a less esthetically pleasing roof surface. Furthermore, a hole must be made in the roof for a ventila¬ tion, duct underneath each cowl.

The solution of providing an extra ventilation ³⁰ duct in connection with the chimney flue itself is little •_<_. used. Such a ventilation duct runs the entire length of the chimney flue, making this solution very expensive and labor-intensive.

The object of the invention is to provide a

35 chimney with ventilator means which is inexpensive to produce and which makes the use of traditional ventilator cowls superfluous.

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This objective is obtained in accordance with the invention by providing in connection with the upper part of a conventional chimney flue, a chamber having an exhaust opening above roof level and containing one or more venti¬ lation ducts, for venting air or effluent gases, as from a sewer.

In a further development of the invention, at the upper part of the chimney flue but below the location where the chimney passes through the roof into the open air, a * support plate is fastened which on at least one side projects outwardly from the chimney flue and supports the above- mentioned chamber.

Another characterizing feature of the invention is that the support plate is bricked in or embedded within the chimney.

Yet another characterizing feature of the inven¬ tion is that the support plate is formed with openings for the passage of ventilation and/or discharge pipes.

In another feature, the empty space within the chamber is filled with insulation material.

Finally, the invention is characterized in that on the exterior, the chimney flue .and the walls of the chamber above the support plate form a single, unified chimneytop structure.

An exemplary embodiment of the invention is illustrated schematically in the accompanying drawings, wherein

Figure 1 shows a longitudinal section through the upper part of a chimney flue with the ventilator means of the invention, and

Figure 2 is a cross section along the line A-A in Figure 1.

The drawings show a chimney flue 1 with an insulated 2 smoke flue 3. At the upper part of the chimney 1, below the location at which the chimney passes through the roof 4 to the open air, a support plate 5 is bricked in which on one side projects outwardly from the part of the

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chimney flue 1 below the plate and supports the walls of a chamber 6 containing ducts 7,8 for venting air or effluent gases, as from a sewer. The support plate 5 is formed with openings 9 for the passage of the ducts 7,8 and for the passage of the insulated 2 smoke flue 3 of the chimney 1. The chamber 6 exhausts into the open air above the roof 4. On the exterior, the chimney flue 1 and the walls of the chamber 6 above the support plate 5 form a single, unified chimneytop structure, covered by a cowl 10 at the top. In the exemplary embodiment illustrated in this specification, the ducts 7,8 pass into the chamber 6 through openings 9 in the support plate 5, but the ducts could alternately enter the chamber 6 through the side walls of the chamber. The empty space in the chamber 6 is preferably filled with insulation material.

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