FI112533B - Method of Providing Ventilation and Ventilation Arrangement - Google Patents

Description

112533

Method of Providing Ventilation and Ventilation Arrangement

The invention relates to a method according to the preamble of claim 1 for providing ventilation in a room, in particular a restaurant.

The invention further relates to a room ventilation arrangement according to the preamble of claim 14, in particular a restaurant evening.

There is a prior art method for providing ventilation in a room space, such as a restaurant room, where a low inlet air is supplied to the room space near the floor from the walls or in the center area of the room and generally vented from the ceiling. The purpose of this method is to provide replacement ventilation, in which the supply air and extract air are mixed as little as possible.

However, providing ventilation in a room space, especially a restaurant space, divided into areas for smokers and non-smokers, is problematic from the generally used method described above. This is because cigarette smoke spreads easily from one or more areas intended for smokers to non-smoking areas, and in particular the border area is wide and variable, depending on the number of people in the restaurant and their movement. A clear way to solve the problem is that said areas are bounded; 20 will be completely different premises. However, this is usually not the case because: the restaurant space is intended to be kept as a single area where both customers and people can move relatively freely.

Another major problem with the ventilation of the room, especially the restaurant, is' separate workstations in the area specifically for smokers. Tobacco smoke 25 generally penetrates the workplace and is particularly detrimental to workers who do not smoke themselves. There is no clear way in the art to solve this problem. More recently, this issue has been the subject of debate.

The object of the invention is to eliminate the drawbacks associated with the above ventilation method. It is also an object of the invention to provide a new method, preferably two new methods, for providing ventilation in a room space, especially in a restaurant space.

2 112533

The method according to the invention for providing ventilation in a room, in particular in a restaurant, is characterized in what is set forth in claim 1.

The ventilation arrangement 5 of the room, in particular the restaurant, according to the invention is characterized by what is set forth in claim 14.

Preferred embodiments of the invention are disclosed in the dependent claims.

According to the invention, in a method for providing ventilation in a room space, in particular its restaurants, which are divided into areas for smokers and non-smokers, a downward airflow barrier, preferably a wall, is provided at the border of the areas.

According to the invention, a ventilation arrangement of a room space, in particular a restaurant, divided into areas for smokers and non-smokers, is a downwardly directed air flow barrier, preferably a wall arranged at the boundaries of the areas to roof structures.

The basic idea of the invention is that at the boundary of the areas a barrier of air flows is provided at the ceiling surface and deaeration is provided in connection therewith. The warm air rises upward and the I20 tends to move in the vicinity of the roof structures and mix with them. The flow barrier now restricts the passage of air between the areas, and in particular, the area of the smokeless air to the non-smokers in the vicinity of the roof of the area reserved for smokers. The air is removed by air; . in or near the main stream.

An advantage of the invention is that ventilation can now be provided in the room space, in particular in its restaurants, which are divided into areas for smokers and non-smokers, so that tobacco smoke or the like cannot pass into areas intended for non-smokers. The amounts of airborne contaminants that enter non-smoking areas are very low and below the set norms. Amount of harmful particles and other air pollutants in the room air, which, as a rule, are due to smoking, especially at work, | on roads, the invention drops a fraction of the room air of existing workstations.

3, 112533

A further advantage of the invention is that it is possible to provide work areas in the areas intended for smokers where the amount of tobacco smoke and other similar harmful particles remains below the target level. By doing so, for example, the restaurant bar can be divided into a smoking area and a 5 non-smoking area for employees, in accordance with the bar counter. Similarly, for example, game tables can be isolated in the area of smokers from smoke-free workstations.

The invention will now be described in detail with reference to the accompanying drawing, in which Figure 1 illustrates a top view of a room, in particular a dining room, in which the room ventilation method and arrangement according to the invention is applied; Fig. 2A is a cross-sectional view of the barrier and also a sectional view A-A of the room of Fig. 1; Figure 2B is a bottom view of an obstacle of Figure 2A; Figure 2C is a bottom view of an alternative to the barrier of Figure 2A; Fig. 3A is a cross-sectional view of a third barrier and at the same time an alternative; ,, A-A cross-section; ·:; Figure 3B is a side view of the barrier of Figure 3A; . Figure 20C is a side view of an alternative to the barrier of Figure 3A; Fig. 4 shows a cross-section of the fifth barrier and at the same time an alternative 'A-A cross-section; ; Figure 5 shows an enlarged cross-sectional view B-B of the work space of Figure 1 'at one workstation; and Figure 6 shows an enlarged cross-sectional view C-C of the second work station in Figure 1:; the state of the room.

',,, * Room space 1, particularly the restaurant space, is divided into areas 2 in Figure 1; 2a, 2b; 3 such that ', I and first region 2; 2a, 2b is a smoking area, i.e. a smoking area, and another area 3 is a non-smoking area, i.e. a non-smoking area. Each nutrient-30 tolathan or equivalent 1 into area 2; 2a, 2b; 3 tables are usually placed with chairs for 4 112533 customers. The service staff and clients will then have the opportunity to move relatively freely within the smoking area and the non-smoking area.

According to the invention, ventilation is provided in the room 1 so that the areas 2 for smokers and non-smokers; 2a, 2b; 3 to boundary 4; The ceiling structures 5a, 4b, 4c 5 are provided with a downwardly and uniformly longitudinal airflow barrier 6, preferably a wall, which extends through the entire room space from wall to wall. Further, in accordance with the invention, air is discharged from room 1 in connection with or in the immediate vicinity of this barrier 6.

The function of the barrier 6 is to restrict and prevent the smoking area 2; 2a, 2b, the upward flow of heated contaminated air from the side to roof 10 into the non-smoking area 3. The obstruction 6 thus severely limits the flow of substantially horizontal air currents in the vicinity of the ceiling 5.

The roof structures of the room 1, in particular the restaurant, generally include a lowered ceiling 5a. Between the actual roof and the suspended ceiling is placed eg. ventilation ducts, lamps and electric cables. The barrier 6 is then specifically arranged as a wall downwards from the ceiling 5a or the like. The ceiling 5a is also considered to be at least a relatively airtight structure.

The height h of the barrier 6 from the roof structure 5 downwards is arranged substantially smaller; si as room height. The height of the room is usually in the order of 250 - 270 cm. The height h of the barrier 6 is most preferably between 15 and 70 cm. However, it should be noted that the barrier 6 is arranged in the roof structure 5 so that its protruding end 7c does not extend so low that it would interfere with people moving in the restaurant space 1 or the like. As a result, it generally does not extend 200 cm to the height of the Mata sheep when viewed from the floor.

The sides 7a, 7b of the barrier 6 are vertical in the exemplary embodiments of the drawings, but may also be inclined or oblique to a plane of a roof such as a ceiling 5a.

Barrier 6 can be made of many materials such as transparent acrylic sheet, wood, metal, fabric, etc.

Barrier 6 is provided with a plurality of exhaust air openings 8. These exhaust air openings are arranged substantially in the longitudinal direction of barrier 6, i.e. in the direction of a room ceiling such as ceiling 5a, 5112533 and preferably over the entire length of barrier 6. The exhaust air openings 8 are connected by a suitable exhaust air duct 9 to the exhaust air device 10. The obstruction 6 itself may be e.g. hollow, whereby its interior space forms part of the exhaust air duct. The exhaust air openings 8, the exhaust air duct (s) 9, and the exhaust air device 10 together form at least a portion of the ventilation means of the room 1. Through the exhaust air openings 8, at least part of the air to be removed is first transferred to the exhaust air duct 9 and further through the actual exhaust air device 10 out of the room 1.

The exhaust air openings 8 may be arranged in the obstruction 6 in a variety of ways, as illustrated in Figures 2A, 2B, 2C, 3A, 3B and 3C.

10 Exhaust air openings 8; 8a, 8b are most preferably provided with barrier 6; 6a, 6b, as shown in Figures 2A, 2B and 2C. In this case, the barrier 6; 6a, 6b both sides 7a, 7b are intact.

Barrier 6; The sides 7a, 7b of the panels 6a, 6b direct a downward airflow towards the barrier 6 in the direction of a plane roof, such as a suspended ceiling 5a; 6a, 6b is a longitudinal protruding end 15 7c having exhaust air openings 8; Through 8a, 8b, room air is drawn in and out of room 1.

Alternatively, the exhaust air openings 8; 8c, 8d provided at least a barrier 6; 6c, 6d to one side 7; 7a, most preferably directed to the area 2 for smokers; 2a as shown in Figures 3A, 3B and 3C. Exhaust air openings 8; 8c, 8d it is possible for I ξ * i 20 to provide an obstacle 6; 6c, 6d on both sides 7; 7a, 7b but smoking '; exhaust area openings (not shown in the drawings) for the area of the carpets (not shown in the drawings) are not necessary. They can, of course, enhance the ventilation in the non-smoking area 3. However, what is important in this case is that the smoking area 2 in particular; 2a, 2b the deaeration takes place by the barrier 6; 6c, 6d ll ·; 25 heights effectively.

In the exemplary embodiments described above, the exhaust air openings 8 are arranged in connection with a barrier 6. In the embodiment of Figure 4, a plurality of exhaust air openings 8; 8e (and 8f) is provided by barrier 6; 6e in the immediate vicinity (see dashed line in Figure 1). Exhaust air openings 8; 8e (and 8f) is preferably provided by barrier 6; 6e adjacent to the roof 30 in the structure 5 and in particular in the exhaust air duct 9 fitted thereto; 9b (and 9c). Exhaust air duct 9; 9b (and 9c) and at the same time the exhaust air openings 8; 8e (and 8f) are substantially in the longitudinal direction of the barrier, either completely within the barrier 6; 6c to the roof junction or eg 10-15 cm from it. 6 112533 air duct 9; 9b, 9c with exhaust air openings 8; For example, 8c, 8d is 50 cm from the obstacle.

Exhaust air duct 9; 9b with exhaust air openings 8; 8c is most preferably provided at boundary 4 only; 4a on one side and particularly the smoking area 2; 2a. However, it may also be provided in the non-smoking area 3 of the barrier 6; 6e as shown in dashed lines in Figure 4. Again, the exhaust air openings 8; 8c, 8d are connected to the exhaust air duct 9; 9b, 9c to the actual exhaust air device 10; 10a, by means of which at least part of the room air to be removed is moved out of the room 1.

In the above embodiments of the barrier 6, the exhaust air openings 8 are separate spaced openings, as can be seen in Figures 2B and 3B. In a preferred embodiment of the invention, the exhaust air openings 8; 8b, 8d being elongated substantially along a barrier 6; 6b, 6d, as shown in Figures 2C and 3C.

In the method according to the invention, the supply of fresh supply air is preferably arranged in one or more non-smoking areas 3; 3a. The supply air supply is effected by a supply air supply device 11, which is most preferably fitted to the roof structures 5 of the area 3 for non-smokers. The supply air supply is further arranged to occur at a low flow rate, preferably 0.1-0.2 m / s. In this case • '\. 20 The supply air supply device is a low speed supply air supply. The advantage of such a device is that sil-,. has a low air mixing ratio, ie small air jets entering the room do not take in a lot of ambient room air.

Thus, the supply air supply is preferably arranged to occur at the top from room • room 1. However, it is possible to provide the supply air supply alternatively v: 25 from a floor level such as one or more walls or from the central area of room 1 e.g. : with devices that are also most advantageously low speed supply air units. Here too, the-. the supply air units are specifically in the non-smoking area 3.

; It has already been stated above that deaeration from the room is arranged to occur at least: 30 barrier 6; 6a, 6b, 6c, 6d of exhaust air openings 8; 8a, 8b, 8c, 8d. However, the ventilation of the room 1, especially the dining room, often needs to be intensified and then; , a deaeration of the room is arranged to take place in the area specifically for smokers 2; 2a in addition to the exhaust air arrangement arranged in connection with said barrier 6. In this case, it is preferable to provide one or more exhaust air devices 10; 10b 7112533 escaping region 2; 2a to the roof structures 5 as illustrated in Figure 1. Exhaust air device 10; The placement of 10b in the roof structures 5 is most advantageous since the so-called bottom-up warm and saturated with tobacco smoke is effectively sucked in and removed from room 1.

5 Separate service points 12 are often provided in the room 1, in particular the restaurant space; 12a, 12b, such as a bar counter 12a for serving drinks, and a game table 12b such as a card game table, Figure 1. These points 12; 12a, 12b are mostly located in the smoking areas 2; 2a, or at least surrounded by partially or totally smoking area 2; 2b. The problem with such workstations is to wrap workers in a state of fresh air and protect them from tobacco smoke.

The above workstation problem is solved according to the invention so that for each workstation 12; 12a, 12b, Figs. 5 and 6, particularly disposed within the smoking area 2; 2a, 2b or an area thereof, the supply air supply is provided such that: the supply air supply is carried out at a low flow rate, preferably between 0.1 and 0.2 m / s, by a suitable supply air device 13; 13a, 13b; the supply air supply is arranged from above, i.e. down from the roof structure 5, whereby the supply air device 13; 13a, 13b are thus arranged in connection with the roof structure 5, the supply air supply is arranged to take place in its area 15; 15a, 15b from the inside where they are working; and the supply air supply area 15 thus defined; 15a, 15b are delimited by an air flow obstruction arranged around this area i '* .. 20 and directed downwards from the roof structures 5:; 16, preferably by a wall. In addition, it is preferred that the supply air temperature be maintained at i * I ·; preferably near room temperature so that their temperature difference does not exceed 5 ° C.

Ventilation arrangements according to the above method are illustrated; 1, 5, 6 and 7. Low speed supply air device 13; 13a, 13b are fitted to the work station 12; 12a, 12b for roof structures. Fig. 5 shows the ventilation arrangement of a restaurant or similar barite workstation, while Fig. 6 shows, for example, a ventilation arrangement of a gaming table or kitchen counter. Supply air device 13; A downwardly directed air flow barrier 16 is provided around the roof structures 13a, 13b; 16a, 16b, 30 preferably a wall. This airflow barrier 16 may be part of the actual room wall 23 or the like, as illustrated in Figure 5.

airflow barrier 16; 16a, 16b determine the supply air intake area 15; 15a, 15b. '' flow barrier 16; 16a, 16b; 15a, 15b covers an area essentially equal to the employee's working area i. the area in which the employee mainly serves 8 112533 customers. Air flow barrier 16; 16a, 16b; 15a, 15b are, for example, at least half, preferably about 70-80%, up to 100%, of the worker range. the supply air device 13 itself; 13a, 13b, in particular the feed portion fitted to its roof structure 5, is generally substantially smaller in area than the area delimited by the airflow barrier 16 5. Supply air device 13; The area 13a, 13b is e.g. 30 to 60% of the area delimited by the air flow barrier, but may be up to 100% in some applications.

air flow barrier 16; 16a, 16b the height h1, h2 when viewed from the ceiling 5a is at least 150 mm and at most 300-400 mm. However, in some cases, part of the air flow barrier 16 is part of the actual wall 23 of the room so that it extends from top to bottom. With air flow barrier 16; 16a, 16b are thus enclosed supply air device 13; 13a, 13b to form a clear supply air area with low supply air velocities, i.e., in the order of 0.1-0.2 m / s. This prevents the impure air from mixing with the workplace air, i.e., the smoky air entering the smoking area 2; 2a, 2b to work station 12; 12a, 12b.

5 and 6, the air flow barrier 16; 16a can be implemented, e.g., from a transparent acrylic sheet, wood, metal, fabric, etc. At the bar workstation, one or more supply air devices 13; 13a, viewed from above, covers, for example, 50% of the free working area of the bar staff inside the bar counter 17. Air flow barrier 16; In connection with 16a, shelves 18 can be provided for glasses 20 and other equipment required at the bar work station. Airflow at workstation 12; 12a, 12b occur outwardly from the work station in the direction of arrows D, E, as illustrated in Figures 5 and 6. Thus, the tobacco smoke of persons smoking on the bar counter 17 or at the gaming table 19 is prevented from penetrating the workstation, but is sucked into an exhaust air device such as the border 4 for smokers and non-smokers; 4a, 4b an adapted barrier 6; 6a, 6b out of the room 1, as previously described.

Air flow barrier 16; 16a, 16b may also be implemented as an airflow barrier 6 applied to a smoking area 2; 2a, 2b and a non-smoking area 3 at boundary 4; 4a, 4b and.: With which the exhaust air from the room space is arranged to take place at least in part.

. 2A, 2B, 2C; 3A, 3B, 3C and 4 the obstacles shown 6; 6a, 6b, 6c, 6d, 6e (as such may be arranged around the supply air device 13; 13a, 13b to define the supply air supply area 15; 15a, 15b.

. ; As shown, barrier 6; 6a, 6b are adjustable by a barrier 16; 16a in place of workstation 12; 12a in Figure 5, whereby also the ventilation at the edge of the workstation is enhanced and the ventilation arrangement 35 is simplified.

9 112533

In a most preferred embodiment, the ventilation arrangement provided at the work station comprises two temperature sensors 20, 21 connected to the supply air control unit 22 and this further to the supply air device 14 through which the supply air is supplied to the work station 12; 12a, 12b to the supply air supply device 13; 13a, 13b. A first temperature sensor 21 is disposed at the work station, preferably near the roof structures 5 of the work station, to measure the supply air temperature Ti, and a second temperature sensor 21, respectively, in the smoking area 2; 2a, preferably near the roof structures 5, for measuring room air temperature T2. The temperatures Th T2 provided by the temperature sensors 20, 21 are monitored and the necessary supply air heating / cooling instructions are provided from the control unit 22 to the supply air device 14 to supply a suitable supply of warm air from the supply air supply means 13; 13a, 13b to work station 12; 12a, 12b. The supply air temperature T1 and the room temperature T2 to be supplied to the workstation should be kept approximately the same, but with the temperature difference T2 - T [not exceeding 5 ° C]. By doing this, it is possible to keep the airflow D, E from the work station 12 very efficiently; 12a, 12b outward-15 towards the smoker area 2; 2a, 2b, and this airflow cannot be created nor the work station 12; 12a, 12b and Smoker Area 2; 2a, 2b, a temperature difference can be formed that would mix said airflows and possibly cause tobacco smoke to penetrate the workstation.

20 At workstation 12; According to experimental measurements 12a, 12b, the above ventilation method and arrangement achieves up to thirty times smaller failures. purity (smoke, nicotine, dust, etc.) as in the environment, ie for smokers * '*! within region 2; 2a, 2b.

':' ·: The invention is not limited to the above exemplary embodiment, but: '; 25 many modifications are possible, subject to the claims ;; within the scope of inventive thought.

Claims (26)

112533 A method for providing ventilation in a room (1), in particular a restaurant space, which is divided into areas for smokers and non-smokers (2; 2a, 2b; 3), characterized in that roof areas (4; 4a, 4b, 4c) 5) 5 is provided with a downward airflow barrier (6; 6a, 6b, 6c, 6d, 6e), preferably a wall, and air removal from the room is arranged to take place at least partially in the vicinity of the barrier (6; 6a, 6b, 6c, 6d, 6e). Method according to Claim 1, characterized in that the height (h) of the barrier (6; 6a, 6b, 6c, 6d, 6e) is arranged substantially lower than the height of the room, most preferably between 15 and 70 cm. Method according to Claim 1 or 2, characterized in that a plurality of exhaust air openings (8; 8a, 8b, 8c, 8d) are provided in the barrier (6; 6a, 6b, 6c, 6d), which are connected to the deaeration device (10; 10a). and through which at least part of the exhaust air is removed from the room (1). Method according to claim 3, characterized in that the exhaust air openings (8; 8c, 8d) are arranged at the protruding end (7; 7c) of the barrier (6; 6b). A method according to claim 3, characterized in that the exhaust air openings (8; 8c, 8d) are arranged on at least one side (7; 7a, 7b) of the barrier (6; 6c) which: * is most preferably directed to the area for smokers ( 2; 2a). > »: 20 Method according to Claim 1 or 2, characterized in that an exhaust air duct (9; 9b, 9c) having a plurality of exhaust air openings (8; 8e) is provided in the immediate vicinity of the barrier: (6; 6e), preferably the roof structure (5). , 8f), which connects the exhaust air duct (9; 9b, 9c) to the deaeration device (10; 10a) and through which at least a part of the exhaust air is transferred out of the room (1). :: 25 Method according to claim 3, 4, 5 or 6, characterized in that. the exhaust air openings (8b, 8d) are arranged as an elongated uniform venting gap of substantially length of barrier (6c, 6d). A method according to any one of the preceding claims, characterized in that the supply air supply (11) is arranged in a region (3; 3a) intended for non-smokers. , 30 Method according to claim 8, characterized in that the supply air supply (11) is arranged to take place at a low flow rate, most preferably between 0.1 and 0.2 m / s. 112533 Method according to claim 8 or 9, characterized in that the supply air supply (11) is arranged to take place from above in the room (1). A method according to any one of the preceding claims, characterized in that the exhaust air from the room space (10b) is arranged to take place in the smoking area 5 (2; 2a) in connection with the exhaust air arrangement (10a) arranged in connection with the barrier (6; 6a, 6b, 6c, 6d, 6e). ). A method according to any one of the preceding claims, characterized in that a supply air supply (13; 13a, 13b; 14) is arranged at the work station (12; 12a, 12b), which is particularly located in the smoking area (2; 2a, 2b), such that 10. the supply air supply (13; 13a, 13b) is carried out at a low flow rate, preferably between 0.1-0.2 m / s; supply air supply (13; 13a, 13b) is arranged from above; and the supply air supply (13; 13a, 13b) is arranged to take place from an area (15; 15a, 15b) substantially corresponding to the work area of the worker, and the supply air supply area (15; 15a, 15b) is delimited by an obstruction downwardly from the roof structures (5). (16; 16a, 16b; 6; 6a, 6b, 6c, 6d, 6e), preferably by a wall; and removing air from the room is arranged to take place at least partially in the vicinity of the workstation (12; 12a, 12b) airflow barrier (16; 16a, 16b; 6; 6a, 6b, 6c, 6d, 6e). : 20 A method according to claim 12, characterized in that the supply air temperature (Ti) is preferably kept close to the room air temperature (T2) so that; their temperature difference does not exceed 5 ° C. A ventilation arrangement of a room (1), in particular a restaurant, divided into areas for smokers and non-smokers (2; 2a, 2b; 3), characterized in that the downward airflow barrier (6; 6a, 6b, 6c). , 6d, 6e), preferably. a wall, arranged at the boundary of the areas (4; 4a, 4b, 4c) to the roof structures (5), and the air removal from the room is arranged to take place by the exhaust air means (8; 8a, 8b, 8c, 8d, 8e, 8f; 9; 9a, 9b). , 9c; 10; 10a) at least partially in the vicinity of the barrier (6; 6a, 6b, 6c) A ventilation arrangement according to claim 14, characterized in that the height (h) of the barrier (6; 6a, 6b, 6c, 6d, 6e) is substantially less than the height of the room, most preferably between 15 and 30 cm. 112533 Ventilation arrangement according to Claim 14 or 15, characterized in that a plurality of exhaust air openings (8; 8a, 8b, 8c, 8d) are arranged in the barrier (6; 6a, 6b, 6c, 6d) and connected to the venting device (10; 10a) and through which at least part of the exhaust air is transferred out of the room (1). Ventilation arrangement according to claim 16, characterized in that the exhaust air openings (8; 8c, 8d) are arranged at the protruding end (7; 7c) of the barrier (6; 6b). Ventilation arrangement according to Claim 16, characterized in that the exhaust air openings (8; 8c, 8d) are arranged at least on one side (7; 7a, 7b) of the barrier (6; 6c) which is most preferably directed to the area (2; 2a). Ventilation arrangement according to claim 14 or 15, characterized in that in the immediate vicinity of the barrier (6; 6e), preferably in the roof structure (5), an exhaust duct (9; 9b, 9c) is provided with a plurality of exhaust air openings (8; 8e, 8f), the exhaust air duct (9; 9b, 9c) being connected to the deaeration device (10; 10a) through which at least part of the exhaust air is transferred out of the room (1). Ventilation arrangement according to claim 16, 17, 18 or 19, characterized in that the exhaust air openings (8b, 8d) are arranged as an elongated uniform venting gap of substantially the length of the barrier (6c, 6d). The ventilation arrangement according to any one of claims 14 to 20, characterized in that the supply air supply device (11) is arranged in a non-smoking area (3). A ventilation arrangement according to claim 21, characterized in that the supply air supply device (11) is a low-speed ventilation device. ; A ventilation arrangement according to claim 21 or 22, characterized in that the supply air supply device (11) is arranged in the roof structures (5). Ventilation arrangement according to one of the preceding claims 14 to 23, characterized in that a low-speed air supply device (13; 13a, 13b) is provided at the work station (12; 12a, 12b), which is particularly located in the smoking area (2; 2a, 2b), which is fitted to the roof structures (5) and is provided with a downwardly directed air flow barrier (16; 16a, 16b; 6; 6a, 30 6b, 6c, 6d, 6e), preferably a wall, which is arranged around the supply air device (13; 13a, 13b). arranged to enclose an area (15; 15a, 15b) substantially corresponding to the work area of the worker; and in the vicinity of the air flow barrier (16; 16a, 16b; 6; 6a, 6b, 6c, 6d) of the workstation (12; 12a, 12b) a plurality of exhaust air openings (8; 8a, 8b, 8c, 8d) are provided deaeration device (10; 10a) and through which at least part of the air to be removed is moved out of the room (1). The ventilation arrangement according to claim 24, characterized in that a plurality of exhaust air openings (8; 8a, 8b, 8c, 8d) are provided in connection with the air flow obstruction (6; 6a, 6b, 6c, 6d) of the 5 work stations (12; 12a, 12b). , which are connected to a deaeration device (10; 10a) and by means of which at least part of the exhaust air is transferred out of the room (1). The ventilation arrangement according to claim 24 or 25, characterized in that the arrangement comprises a supply air and room air temperature sensor (20, 21) and a control device (22) for keeping the supply air temperature (Ti) close to the room air temperature (T2) provided that their temperature difference does not exceed 5 ° C.