VENTILATING APPARATUS
Year: 1884

page_text: "
I GEORGE GREIG of Harvieston in the county of Kincardine, North Britain,
Engineer do hereby declare the nature of my invention for
VENTILATING APPARATUS to be as follows:—
"
IMPROVEMENTS IN
The introduction of fresh air into an apartinent for ventilation presents serious
difficulties on account of the sensation of draught which the entering current
produces, especially on such of the occupants as may be near the inlet. My
invention relates to apparatus whereby a large supply of fresh air can be intro-
duced into an apartment in a manner so distributed and diffused that no local
draughts are produced by it. For this purpose, when the apartment is of moderate
size I provide in the centre of the ceiling, an aperture of sufficient area for the
inlet of air, and under this aperture at a short distance below its mouth, I fix a
deflecting plate, which may be circular and is preferably concave on its upper side,
so that air descending vertically through the inlet aperture is deflected in a
horizontal direction and caused to spread out and flow along the ceiling, gradually
diffusing itself in the atmosphere of the apartment. The supply current may be
produced by any convenient means. When there is an outlet for the foul air of
the apartment, subject to a chimney or other draught, the fresh air will naturally
enter to take the place of the foul air that is drawn off. I prefer, however, to
send a current of fresh air into the apartment by means of a fan or blower, as
the maintenance of a plenum effectually prevents smoky chimneys, or offensive or
insalubrious emanations. When the apartment is of large size, several supply
inlets are provided in the ceiling, each with its deflector, so as to obtain more
equal distribution of the entering air. The deflectors may be ornamented according
to any desired design so as to present the appearance of rosettes, such as are often
on ceilings or in their panels. It is in many cases advisable to place the mouth
of the fresh air inlet and the deflector some distance below the ceiling so that
the air may distribute itself without having to flow along the ceiling. As gas
or other lights or sun burners are often arranged under or in rosettes, I provide,
in such cases, a central tube for the passage upwards of the foul air and products
of combustion, and around it an annular passage for the descent of the fresh air
supply, the rosette deflector extending outwards from the mouth of the central
tube.

page_text: In some cases I make the passage for admitting fresh air in the centre of a
chandelier opening below the light branches with a deflector under its mouth,
and I provide an annular passage around the fresh air conduit for the escape of
foul air and products of combustion. The central air pipe when arranged in
connection with a moveable chandelier is made telescopic, so as to admit of the
up or down movement of the chandelier, and the deflector, when it is placed
under the light branches as described, is preferably of glass or translucent
material so as to lessen shadow.
ABEL & IMRAY,
Agents for the Applicant,
28, Southampton Buildings,
London, W.C.
I, GEORGE GREIG of Harvieston in the county of Kincardine, North Britain,
Engineer do hereby declare the nature of my said invention for
"IMPROVEMENTS
IN VENTILATING APPARATUS" and in what manner the same is to be performed to
be particularly described and ascertained in and by the following statement:-
The introduction of fresh air into an apartment for ventilation presents serious
difficulties on account of the sensation of draught which the entering current
produces, especially on such of the occupants as may be near the inlet. My
invention relates to apparatus whereby a large supply of fresh air can be intro-
duced into an apartment in a manner so distributed and diffused that no local
draughts are produced by it. For this purpose, I arrange the inlet for fresh air as
shewn in fig 1 of the accompanying drawings. When the apartment is of moderate
size, I provide in the centre of the ceiling, an aperture A of sufficient area for the
inlet of air, and under this aperture at a short distance below its mouth I fix a
deflecting plate B, which may be circular and is preferably concave on its upper
side, so that air descending vertically through the inlet aperture is deflected in a
horizontal direction as indicated by arrows, and caused to spread out and flow
along the ceiling, gradually diffusing itself in the atmosphere of the apartment.
The supply current may be produced by any convenient means. When there is an
outlet for the foul air of the apartment, subject to a chimney or other draught, the
fresh air will naturally enter to take the place of the foul air that is drawn off.
I prefer, however, to send a current of fresh air into the apartment by means of a
fan or blower, as the maintenance of a plenum effectually prevents smoky chimneys
or offensive or insalubrious emanations. When the apartment is of large size,
several supply inlets are provided in the ceiling, each with its deflector, so as to
obtain more equal distribution of the entering air. The deflectors may be orna-
mented according to any desired design, so as to present the appearance of rosettes,
such as are often on ceilings or in their panels. It is in many cases advisable to
place the mouth of the fresh air inlet a and the deflector some distance below the

page_text: ceiling, as shewn in fig. 2, so that the air may distribute itself without having to
flow along the ceiling. As gas or other lights or arm burners are often arranged
under or in rosettes, I provide in such cases, as shewn in fig. 3, a central tube O for
the passage upwards of the foul air and products of combustion and around it an
annular passage D for the descent of the fresh air supply, the rosette deflector E
extending outwards from the mouth of the central tube.
In some cases, I make the passage A for admitting fresh air, as shewn in fig 4, in
the centre of a chandelier opening below the light branches F with a deflector B
under its mouth, and I provide an annular passage G around the fresh air conduit
for the escape of foul air and products of combustion.
The central air supply when arranged in connection with a moveable chandelier
is mado telescopic, so as to admit of the up or down movement of the chandelier,
and the deflector B when it is placed under the light branches as described, is
preferably of glass or translucent material so as to lessen shadow.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is :-
In combination with an inlet for fresh air at or near the ceiling of an apartment
a deflector placed under the inlet, substantially as and for the purposes herein
set forth.
ABEL & IMRAY,
Agents for the Applicant,
28, Southampton Buildings,
London, W.C.