[0001] This invention relates to ventilators.
[0002] A ventilator is normally fixed to a roof or wall of a building by means of a base
flange which is flashed to the roof or wall cladding to prevent water penetrating
between the cladding and the ventilator body and so entering the building.
[0003] Water can also penetrate bolt holes and rivet holes in the body and drip into the
building.
[0004] Where a ventilator body is flashed to a roof or wall the part of the body exposed
on the outside cf the building cannot be removed to give access to working parts of
the ventilator however unless it is removably attached in position.
[0005] To this end, the present invention provides a ventilator having a body presenting
a base flange for flashing the ventilator to a roof or wall, the base flanges being
formed on a base having a wall extending away from the base flange on one side thereof
and defining a ventilation opening through the base, said wall having lip portions
overhanging said base flange, and an outer body part composed of straight, channel
sectioned members removably interconnected with one another at their adjacent ends,
the channel members each presenting a pair of walls extending away from the base flange
to the outside cf said ventilation opening defining wall and each having its wall
adjacent the ventilation opening defining wall engaged under an overhanging lip portion
of the ventilation opening defining wall.
[0006] A specific embodiment of the present invention will now be described by way of example,
and net by way of limitation, with reference to the accompanying drawings in which
:
FIG. 1 is a cross-section of a controllable lcuvred ventilator according to this invention
with the louvres shown in their closed position;
FIG. 2 is a plan view of the body of the ventilator shewn in Fig. 1; and
FIG. 3 is an enlarged left hand portion of Fig. 1 showing further details.
[0007] Referring to the accompanying drawings, the ventilator is a louvred ventilator for
roof or wall mounting. The ventilator has a rectangular body comprising a base 10,
best seen in Fig. 2, presenting a base flange 11 for flashing the ventilator to the
roof or wall W. The base flange 11 is flat in the present example but it may be of
any of the standard shapes suitable for flashing it to different kinds of roof or
wall cladding or to glazing bars. The base 10 has an upstanding wall 12 defining a
rectangular ventilation opening 14 through the base, the wall having a downwardly
directed lip 12' along its upper edge overhanging the base flange 11. The base may
conveniently be formed by welding together, as at 10', four roll-formed or extruded
sheet metal, e.g. aluminium, parts 10a, lOb, having the section shown in Figs. 1 and
3. Alternatively, square corner pieces may be welded tc a single rcll-formed part
of the same section which is slit and bent to fcrm a rectangular frame, with the wall
12 in one piece. Ventilation through the opening 14 is controlled by the louvres 15
(see Figs. 1 and 3) which also weather the opening.
[0008] The ventilator further comprises a readily removable outer body part 20 made up of
cpposite pairs of straight channel sectioned members 16,16 and 17,18 removably interconnected
with one another at their adjacent ends by means of self-tapping screws 21. The members
16, 17, 18 are formed as extruded metal, e.g. aluminium, sections and each presents
an equally spaced pair of walls extending away from the base flange 11 to the outside
of the wall 12. The wall, e.g. 18' (see Fig. 3) of this pair of walls adjacent the
wall 12 abuts the outside of the wall 12 and is engaged under the overhanging lip
portion 12', each wall, such as 18', itself having a corresponding downturned lip
along its upper edge. The adjacent walls, such as 18', of all the members 16, 17,
18 substantially correspond with one another in cross-sectional size and shape to
interfit with the wall 12 in the manner seen in Fig. 3. The webs or floors 16a, 17a,
18a of the channel members 16, 17, 18 abut the base flange 11. The channel members
16, 17, 18 act as drainage channels for water which runs off the louvres 15. The other
upstanding walls 16", 17" and 18" of the channel members 16, 17, 18 form a rectangular
frame or box which carries the pivots for the outer ends of the louvres 15.
[0009] The members 16, 17, 18 forming the body part 20 or box are offered up separately
to the base 10, when constructing the ventilator and rotated into position with their
walls such as 18' engaging with their downturned upper edge lips under the lip 12'.
The fixing screws 21 are then inserted tc unite the box and fix the box to the base.
[0010] The end of each channel member 16 may open through the wall 18" to drain off water
from the channels outside the body of the ventilator.
[0011] The base 10 is welded in one piece and is nowhere penetrated by fixing hcles. Provided,
therefore, that the flange 11 is prcperly flashed tc the rcof or wall W, water cannot
penetrate under or through the base. At the same time, the body part 20 of the ventilator
which is exposed outside the roof cr wall is readily removable, by removing the screws
21, to gain access to the louvre operating mechanism of the ventilator, e.g. for servicing.
[0012] This invention is applicable to other kinds cf roof and wall mounted ventilators
and is not restricted to louvred ventilators.
1. A ventilator having a body presenting a base flange (11) for flashing the ventilator
to a roof or wall (W), the base flange (11) being formed on a base (10) having a wall
(12) extending away from the base flange (11) on one side thereof and defining a ventilation
opening (14) through the base (10), said wall (12) having lip portions (12') overhanging
the base flange (11), and an outer body part (20) composed of straight, channel-sectioned
members (16, 16, 17, 18) removably interconnected with one another at their adjacent
ends, the channel-sectioned members (16, 16, 17, 18) each presenting a pair of walls
extending away from the base flange to the outside of said ventilation opening defining
wall (12) and each having its wall (e.g. 18') adjacent the ventilation opening defining
wall (12) engaged under the overhanging lip portion (12') of the ventilation opening
defining wall (12).
2. A ventilator as claimed in claim 1 in which the channel-section member walls (e.g.
18') adjacent the ventilation opening defining wall (12) engage under said overhanging
lip portion (12') of the ventilation opening defining wall (12) with lip portions
overhanging the channel-sectioned member floors.
3. A ventilator as claimed in claim 1 or 2 in which the channel-sectioned members
are formed as extruded metal sections and are interconnected at their adjacent ends
by means of self-tapping screws.
