The present invention relates to a ventilation device for use at a doorway in a building.
Ventilation air flows between rooms and zones in buildings has been achieved by the provision of ventilation devices in doors and also in partition walls of the building. These devices have been installed by cutting a suitable aperture in the door (or in the partition wall) and fitting the device into the aperture. However this arrangement has the disadvantages that fitting of the device is awkward and can weaken the door structure, and further there is often a deleterious effect on aesthetic quality of the door or partition wall.
A ventilation system for use in a window type structure is described in DE-A-1934996, the system including a ventilation duct in a frame part of the window surround whereby ventilation air can pass directly through the frame part between an inlet and an outlet on opposite faces of the frame part, a laterally projecting portion from the frame part constituting a sealed abutment for a movable glazing unit. The air outlet includes an air flow control. EP-A-0115824 shows a generally similar ventilation system for glazed windows or doors. In this case however the outlet for the air from the system ventilation duct faces downwardly. Additionally in contrast to DE-A-1934996, the ventilation duct of this system forms a portion of the actual movable sash or glazing unit of the window as distinct from the window surround, the duct being secured to a frame part of the sash and including means to support a glazing assembly.
It is an object of the present invention to provide a ventilation device for fitting at a doorway so as to be relatively unobtrusive, but which is convenient to fit and which gives satisfactory ventilation performance.
According to the present invention there is provided a ventilation device as set out in the appended claim 1.
Preferably the elongate member is adapted to serve as a top edge member of a doorway.
Embodiments of the present invention will now be described by way of example with reference to the accompanying drawings wherein;
Referring to Figs. 1 to 3, a vent 9A is fitted at the top of a door 35. The door aperture is provided, in conventional manner, with upright wooden standards 36 and a top transverse standard 37 bounding the wall blockwork 38 surrounding the door aperture. The blockwork 38 has plaster surface linings 39, and the normal door facings 40 and bottom skirtings 41 are present. Each of the standards 37, 38 includes step of jamb (stop) portions. The vent 9A comprises a box condiut structure 42 which can be made by an extrusion process. The structure 42 includes an air inlet 24, the outlet 22A being provided with an airflow control comprising a fixed apertured plate 22 and a slidable apertures plate 21 for "hit-and-miss" control with the plate 22. The vent conduit structure 42 is secured to the top standard 37, which can be rebated as shown to accept the conduit.
Alternatively, if the standard 37 is of rectangular cross-section, suitable packing can be provided at zone 37A. The vertical leg of the L-shaping conduit 42 presents a wall surface 43 serving as a door stop, and the conduit's vertical leg will have an appropriate length to meet the particular application eg. for fire door use.
An additional door stop strip 37B is secured to standard 37. The ends of the conduit structure 42 are closed by appropriate end caps 15.
For use with fire doors, the conduit structure 42 can include a channel to house a fire safety element 44 comprising for example an intumescent fire strip. The conduit structure 42 could house baffle means such as for example of cartridge form. Futher, a clip-on cover or nose drip 45 can be located at the inlet 24, especially where the door 35 is an external door (opening outwardly in this case).
The above vent 9A provides a very simple efficient and effective means of secondary ventilation through buildings involving the passage of air over the head of the door rather than via vents fitted into apertures in the door, or through an opening in the partition or wall enclosure.
The conduit structure 42 can comprise a simple extruded box section (with various possible adaptations for fly screens, thermal or sound baffle cartridges as per the window vent type etc.) which replaces the top door stop on the door standard or door set. Individual vents would be cut (to the full internal size of door set)from a long length of extruded section and, along with end caps etc., the full assembly would then be screwed up onto the top standard thus providing the door stop as well as the ventilator.
The conduit can either be fixed into a pre-rebating standard or planted straight onto the standard as illustrated. The door stops can either be "part only" to line through with width of projectiong section of vent unit or packed out and taken full width of door standard without any complications.
The section could be formed in a number of different materials and could have a number of control systems.
The above vent device for doors has the following advantages:-
The system provides the following range of options:
By means of only the two basic VENT systems (door and window openings) and the possibility of sound or thermal baffle 'cartridges' complete control of the enviroment is very easily maintained. The simplicity, efficiency and flexibility of the present Enviroment System provides for the possibility of highly tuned natural secondary ventilation from zero air changes up to many times the minimum Building Regulation standards.
Specifically Fig. 4 shows a typical five apartment house layout demonstrating may of the Enviroment Systems.
The essence of the above Enviroment Systems is one of considering the control and efficiency of secondary ventilation of buildings as a science in its own right rather than the traditional idea of ventilators being considered like accessories for windows and doors.
The control units for the various window and door vents WV, DV are shown schematically as item C (CO being such units in the open condition). The cross hatching shows home areas, specifically the lounge and hall, in a ventilated mode by means of the open control units CO.
The embodiment shown in Fig. 5 is applied in a door like the embodiment of Figs. 1 to 3 and like parts carry like reference numerals. However in this case the door head frame member is formed as a cellular form plastics extrusion 56. Integral with the extrusion 56 is a door vent 57 generally similar to the vent 9A of Fig. 1. As previously, a sound proof baffle could be installed in the vents 52 or 57.
As an alternative to the plastics extrusion consturction it would be possible to have the vent structure formed integral with a metal form frame member at an aperture. For example this metal form frame member could take the form of an aluminium extrusion.
Figs. 6 and 7 show a vent 9A in accordance with another embodiment of the present invention fitted at the top of doorway 35 - exactly of the construction shown in Fig. 1, and the vent 9A is basically similar to the vents 9A ofthe previous embodiments.
The conduit 42 is secured by screws 16 to the top standard 37, which can be rebated as shown to accept the conduit.
Alternatively, if the standard 27 is of rectangular cross-section, suitable packing can be provided at zone 37A. Again the vertical leg of the L-shaped conduit 42 presents a wall surface 43 service as a door stop, and the conduit's vertical leg will have an appropriate length to meet the particular application eg. for fire door use. An additional door stop strip 37B is secured to standard 37. A horizontal air discharge 22A is present as in the previous embodiment, and again a control strip 21 is provided for air flow control. The ends of the conduit 42 can be closed by appropriate end caps 15 as previously and generally like parts carry like reference numerals.
The sides 24A, 22A of the conduit structure 42 at the air inlet and the air outlet respectively carry a series of apertures 50, 51 on internal longitudinal walls for lateral airflow through the conduit 42. Each end cap 15 (see Fig. 7) comprises a recessed base part 60 carrying a set of lugs or tongues 61 and 63A with interior corners of the conduit structure 42. Further, the base part 60 presents a laterally directed tab plate 64 on which an end of the air flow control plate 21 is slidable, the tab plate 64 serving to close off a respective end portion of the air flow control 21/22 so that effective air flow control is always possible from zero to maximum rates.
Cord controls can be fitted or control can be by means of recessed mechanism within vertical door frames of vertical door stops.
Thus as shown in Fig. 2, an operating cord 68 is connected to a laterally extending finger grip 23 of the plate 21, and extends to the sides of the vent 9A where it passes through a hole 67 in a downstand bracket 66 on the tab plate 64 and then downwardly to the operating position, so enabling convenient remote control of the vent 9A located at the top door standard.
To facilitate matching requirements and interchangable nose part 42A is provided insertable into a recess in the main conduit 42 and can have various shapes, sizes, colours etc. A strip 16B is fitted into a recess of the conduit 42 to cover the screwheads of screws fitted through apertures 16A.
The conduit 42 can comprise a simple extruded box section (with various possible adaptations for fly screens, thermal or sound baffle cartridges as per the window vent type etc.) which replaces the top door stops on the door standard or door set. Individual vents would be cut (to the full internal size of door set) from a long length of extruded section and, along with end caps etc. the full assembly would then be screwed up onto the top standard thus providing the door stop as well as the ventilator.
The conduit can either be fixed into a prerebated standard or planted straight onto the standard as illustrated. The door stops can either be "part only" to line through with width or projecting section of vent unit or packed out and taken full width of door standard without any complications.
In the embodiment of Fig. 8 a vent 9A is again provided for the top of a doorway but in compariosn with the vent of Figs. 12-14, the vent of Fig. 15 is designed to include structure replacing the top transverse door standard 37, and for this requirement the conduit 42 includes a back portion 42B. In this example the conduit 42 is screwed directly into the top blockwork 38, and the conduit portion 42B can include an access plate 16B for access to fixing screws 16.