GB2332504A

GB2332504A - A chimney flue ventilation cap

Info

Publication number: GB2332504A
Application number: GB9726607A
Authority: GB
Inventors: Dennis Micheal Coates
Original assignee: Individual
Current assignee: Individual
Priority date: 1997-12-18
Filing date: 1997-12-18
Publication date: 1999-06-23
Anticipated expiration: 2017-12-18
Also published as: GB2332504B; GB9726607D0

Abstract

A chimney flue ventilation cap has a cap (1) to cover and overlap the top (3) of a chimney pot incorporating vanes (2) within the perimeter of the underside of the cap which will allow ventilation of the chimney flue whilst preventing ingress into the flue of rain, snow, birds and debris. The cap may be held in place centrally on the pot by various methods including attachment to a sprung retaining clip (5) inserted into and gripping the inside face of the pot. The circumferentially-spaced vanes project radially inwardly of the cap.

Description

2332504 1 Chimney Flue Ventilation Cap This invention relates to a chimney

flue ventilation cap.

When the chimney of a domestic open fire is disused, defects can arise in the structure of the building if (a) the top of the flue is not sealed off or 'capped' to prevent in 1 gress of rain, snow, nesting birds and airborne debris and (b) the flue is not thereafter maintained in an adequately ventilated condition to ensure evaporation of any condensation or other moisture within the flue. The provision of ventilation is important also to ensure the removal from the flue of any noxious gases which might leak into the flue from any adjoining flue.

Capping of the flue is traditionally achieved by (i) removing the chimney pot and capping off the top of the flue with a concrete, slate or stone capping and (5) blocking 0 1:1 Z- up the flue opening at room level. Ventilation of the flue is traditionally achieved by 0 installing a ventilator within the closure of the flue at room level and by incorporating r> Z:- (by various methods) a means of ventilation to the flue either within the capping at the C) top of the flue or within the walls of the chimney stack. The work required to the stack is labour intensive, often also requiring erection of scaffolding. If the flue needs to be restored to use at any time, further substantial work and expense is required to achieve thi s.

According to the present invention there is provided a chimney flue ventilation cap to cover and overlap the top of a chimney pot incorporating vanes within the perimeter of 0 the underside of the cap which will allow ventilation of the chimney flue whilst preventing ingress into the flue of rain, snow, birds and debris. The cap may be held in C c> place centrally on the pot by various methods including attachment to a sprung retaining 1 0 clip inserted into and gripping the inside face of the pot.

I- More particularly, the chimney flue ventilation cap of the invention for location on top of the chimney pot and preventing ingress of matter into the assembly may comprise a I I top portion to cover the top of the pot and, depending from said top portion, a peripheral side wall portion, an a plurality of circu mferenti ally- spaced vanes projecting substantially radially inward of the cap from the side wall portion thereof and adapted, in use, to seat on the top of the pot to locate the cap on position on the pot.

Preferably the vanes terminate at a position just radially inward on the inner diameter of the pot.

Conveniently the vanes depend from the top portion and, in a preferred embodiment, the cap comprises a one-piece injection moulded component, the vanes being integrally formed with the top portion and the side wall portion of the cap.

3 A specific embodiment of the invention will now be described by way of example with reference to the accompanying drawings in which:

Figure 1 shows: Plan view of the top of the cap.

Figure 2 shows: Plan view of the underside of the cap.

Fi-Ure 3 shows: A cross sectional drawing of the cap assuming fixing by C1 1:1 c> W attachment by bolt through a central boss in the cap to a sprung retainer in the pot.

Figure 4 shows: A cross sectional drawing of the cap when fitted to the pot.

Referring to the drawing, the flue ventilation cap is circular in plan. It comprises a cap (1) with vanes (2). The top of the cap is conical in section and is of a diameter larger than the top of the chimney pot (3) to allow ventilation to pass through the gap (4) between the outer edge of the cap (1) and the top of the chimney pot (3). The vanes (2) Z:incorporated around the perimeter of the underside of the cap extend inwards from the outside edge of the cap towards the centre of the cap to a length sufficient to rest on the top edge of the pot (3). The cap is shown fitted to a sprung retaining clip fitted within Z:) 2-:> ZY the pot but might be fixed in position by various alternative rneans.

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Claims

CLAIMS 1 A chimney flue ventilation cap which fits over the top of a chimney pot compnsing a cap to cover the top of the pot and incorporating vanes around the perimeter of the underside of the cap thereby allowing movement of air into and out of the flue whilst preventing ingress of rain, snow, birds and debris.

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2. A cap as claimed in claim I comprising a top portion to cover the top of the pot Z) and, depending from said top portion, a peripheral side wall portion, and a plurality of circumferenti ally- spaced vanes projecting substantially radially inwardly of the cap from the side wall portion thereof and adapted, in use, to seat on the top of the pot to locate the cap in position on the pot.

A cap as claimed in claim I or claim 2 in which the vanes terminate at positions just radially inwardly of the inner diameter of the pot.

4. A cap as claimed in any one of claims 1 to 3) in which the vanes depend from the top portion of the cap.

5. A cap as claimed in claim 4 and comprising a one-piece injection moulded I component, the vanes being integrally formed with the top portion and side wall portion of the cap.

6. A chimney flue ventilation cap substantially as described with reference to and as illustrated by the accompanying drawings.

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