1988-02-18
1990-01-02
Joyce, Harold
52199, 98 4211, 98 4222, 98 661, F24F 702
Patent
active
048905461
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a ventilation cowl for arrangement on a roof of a house.
A problem with many known ventilation cowls is that rain water or other moisture can penetrate into the cowl and that condensation drips from the inner roof of the cowl and runs downwardly along the inner walls of the cowl and is collected in the ventilation cowl or by members connected to the latter.
A ventilation cowl in which the problem mentioned is reduced is shown in Norwegian Patent Application 840941. In the known construction referred to one is however dependent on a ventilation fan in each air duct, so that the exhaust air can be pushed upwardly through the discharge ducts to the ventilation cowl. The reason for this is that in the chamber in the cowl, into which the discharge ducts outlet, there is not obtained sufficient natural pressure. There is generally a problem of ensuring sufficient pressure simultaneously with the prevention of the penetration of moisture into the ventilation cowl to vital parts in the latter.
The object of the present invention is to provide a ventilation cowl where the problems with condensation can be avoided or at least largely reduced.
It is another object of the invention to provide for easy access to the internal parts of a ventilation cowl.
Further the aim is a solution where ventilation fans do not necessarily have to be employed in connection with discharge duct or ducts, the objective being to make provision for effective natural pressure in and around the ventilation cowl.
The ventilation cowl according to the invention is characterised in that it is partitioned into an inner, approximately closed chamber and an outer, airable chamber with associated openings to fresh air, by means of a vertical or substantially vertical partition wall which forms support for one or more outlet union(s) from associated air duct(s), the air duct(s) being connected to the outlet union via the inner chamber and the opening in the bottom-shaped member, while the outlet union(s) is/are preferably directed obliquely outwards and downwards in the outer chamber.
By means of the afore-mentioned solution there can be ensured an effective venting effect in the outer chamber, while an effective closing off of the inner chamber can be provided, so that penetration of moisture into the inner chamber can be prevented and with the aid of simple means access can nevertheless be obtained to the inner chamber when there is need for this.
Should a ventilation fan be required or generally desirable, it is a further objective of the invention to admit such a fan in the ventilation cowl, so that the fan according to need and in a ready manner can be connected to one or more air ducts just in front of their outlet openings and just behind the outer chamber.
The cowl according to the invention is in this connection characterised in that the inner chamber includes a fan, the outlet union of which is supported by the partition wall between the outer chamber and the inner chamber, one or more air duct(s) emptying into the inner chamber just by the inlet opening(s) of the fan.
By arranging a fan according to the invention in the inner chamber provision can be made for an effective airing of the inner chamber, even if this is closed off from the outer chamber. In addition one can obtain a rational utilisation of the fan, since this can be connected according to desire and need to a chamber which can serve a single air duct or can be common to a vent chamber from two or more aid ducts, the fan having the possibility to exhaust the vented air directly outside the chamber in which the fan is placed and can thereby employ almost the whole power of the fan for suction effect and only minimally having a need for the effect of pressure.
Further features of the invention will be evident from the following description, in which there is to be described a couple of embodiments of the solution according to the invention having regard to the accompanying drawings, in which:
FIG. 1 shows schematically a vertical longitudinal ske
REFERENCES:
patent: 2711682 (1955-06-01), Drechsel
patent: 2741972 (1956-04-01), Pryne
patent: 3085490 (1963-04-01), Field
patent: 3199433 (1965-08-01), Busma, Jr.
patent: 3579930 (1971-05-01), Murphy
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