Ceiling-mounted ventilation system

Abstract

To provide a ventilation device that has reduced drop of air quantity, generation of noise and / or design limitation, and that exhibits improved workability.SOLUTION: A housing 4 of a ceiling embedded type ventilation fan 1 serving as a ventilation device has a hooking part 12 provided so as to project upward of a ceiling 10 from a top surface side end part of one side surface 25. The hooking part 12 is provided with a locking part 23 bent in an upstream direction from an extension tip end. An adapter installation plate 13 includes, on an upper part thereof: an upper end extension part 15 extending in the upstream direction and facing the top surface 10; and an engagement opening 20. The locking part 23 prevents the housing 4 from moving in the upstream direction by abutting against the edge part of the engagement opening 20.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention provides Ceiling-mounted type This concerns ventilation equipment. [Background technology]

[0002] Conventionally, a type of ventilation device that is installed in an opening in a ceiling is known. Such a ceiling-mounted ventilation fan exhausts air by connecting an air vent provided in the frame of the ceiling-mounted ventilation fan to a duct via a joint pipe. A mounting plate is used to tightly attach the frame and the joint pipe (see, for example, Patent Document 1).

[0003] A conventional ceiling-mounted ventilation fan will be described below with reference to Fig. 6. Fig. 6 is a cross-sectional view of a conventional ceiling-mounted ventilation fan 101 inserted into an opening 111 in a ceiling 110.

[0004] The ventilation fan main body 102 includes a box-shaped frame 103 having a bottom opening 104 and a blower 118 housed within the frame 103. The blower 118 draws air through the bottom opening 104 via an intake grill 105 and exhausts it through a vent 119 formed in the side wall of the frame 103. A mounting plate 106 is attached downstream of the vent 119. A joint pipe 107 is integrally formed in the mounting plate 106 and protrudes from the center, and a duct 109 is fitted and connected to the outer surface of the joint pipe 107. A shutter plate 108 that opens and closes due to wind pressure is pivotally supported on the joint pipe 107. With this configuration, the ceiling-mounted ventilation fan 101 performs ventilation. In the above configuration, the mounting plate 106 and the ventilation fan main body 102 are installed as follows.

[0005] Mounting plate 106 is inserted and attached along opening 111, and is attached and held to one side edge of opening 111 by the holding force of fitting coupling pipe 107 into duct 109. A flange 113 is formed at the lower end of mounting plate 106, which abuts against the lower edge of opening 111 for positioning. A cut-and-raised inclined piece 112 is formed in the center of flange 113, and its tip is inclined toward the inside of opening 111. A flange 120 is formed at the upper end of mounting plate 106, which covers ventilation fan main body 102. A cut-and-raised inclined piece 114 is formed in the center of flange 120, and a cut-and-raised hole 123 is formed after cut-and-raised inclined piece 114 is cut and raised.

[0006] The ventilation fan body 102 has a flange 121 at the lower edge of the frame 103 that abuts against the lower edge of the opening 111 and is fixed with screws 117. The cut and raised inclined pieces 114 and 122 are formed on the frame 103, and the cut and raised inclined pieces 112 are inserted and guided therethrough. An engaging projection 116 is formed on the upper part of the frame 103 opposite the flange 120. When the ventilation fan main body 102 is inserted into the opening 111, the engaging projection 116 of the ventilation fan main body 102 is inserted into the cut and raised hole 123 of the mounting plate 106, and the cut and raised inclined pieces 112 of the mounting plate 106 are inserted into the cut and raised hole 122 of the ventilation fan main body 102. Then, due to the guidance of the cut and raised inclined pieces 114 of the engaging projection 116 and the guidance of the cut and raised pieces 115 of the cut and raised inclined pieces 112, the ventilation fan main body 102 is guided in a direction in which it presses against and comes into close contact with the mounting plate 106. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Publication No. 101738 Summary of the Invention [Problem to be solved by the invention]

[0008] In such conventional ceiling-mounted ventilation fans, the cut-and-raised inclined pieces 112 and 115 are formed at an angle toward the inside of the opening 111, which blocks the air drawn in through the intake grille 105, reducing the airflow and generating abnormal noise, which presents a performance issue. Furthermore, the cut-and-raised inclined pieces 112 and 115 protrude below the ceiling 110, which presents a structural issue in that there are design limitations on the height at which the intake grille 105 can be installed. Furthermore, when installing the ventilation fan main body 102 and the mounting plate 106, it is necessary to check both the engagement above the ceiling 110 (the cut-and-raised holes 123 and the engaging protrusions 116) and the engagement below the ceiling 110 (the cut-and-raised holes 122 and the cut-and-raised inclined pieces 112), which also presents an installation issue.

[0009] Therefore, the present invention solves the above-mentioned conventional problems, and aims to reduce the reduction in air volume, the generation of abnormal noise, and design restrictions, while improving workability. Ceiling-mounted type The object is to provide a ventilation device. [Means for solving the problem]

[0010] To achieve this object, the present invention One aspect of relating to Ceiling-mounted type The ventilation device comprises a housing formed by a bottom surface having an intake port, a top surface facing the bottom surface, and a plurality of side surfaces connected to the bottom surface and the top surface, the housing having an outlet port on one side, and an adapter installation plate having a ventilation opening facing the outlet port and an adapter protruding downstream from the ventilation opening for connection to an exhaust duct, the housing having a hook portion extending above the top surface from the top surface end of the one side surface having the outlet port, the adapter installation plate having an upper end extension portion extending from its upper end above the top surface in an upstream direction which is opposite to the downstream direction and facing the top surface, and an engagement opening for engaging with the hook portion at least on the upper end extension portion, the hook portion having an engagement portion bent from the extending tip in the upstream direction and engaging with the edge of the engagement opening to prevent the housing from moving upstream, thereby achieving the desired purpose. [Effects of the Invention]

[0011] According to the present invention, the reduction of air volume reduction, the occurrence of abnormal noise, and design limitations are reduced, and workability is improved. Ceiling-mounted type Ventilation equipment can be provided. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a cross-sectional view of a ceiling-mounted ventilation fan as a ventilation device according to the present invention. [Figure 2] 1 is an exploded view of a ceiling-mounted ventilation fan according to the present invention. [Figure 3] 1 is a top view of a ceiling-mounted ventilation fan according to the present invention; [Figure 4] 1 is a side view of a ceiling-mounted ventilation fan according to the present invention; [Figure 5] Schematic diagram showing the movement of connecting the housing to the adapter mounting plate [Figure 6] Cross section of a conventional ceiling-mounted ventilation fan DETAILED DESCRIPTION OF THE INVENTION

[0013] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings to facilitate understanding of the present invention. Note that the following embodiments are examples of specific embodiments of the present invention and do not limit the technical scope of the present invention. Furthermore, the same components are designated by the same reference numerals throughout the drawings, and their description will be omitted. Furthermore, in each drawing, detailed descriptions of components not directly related to the present invention will be omitted.

[0014] (Embodiment 1) First, the structure of a ceiling-mounted ventilation fan as a ventilation device according to the present invention will be described with reference to Figures 1 and 2. Figure 1 is a cross-sectional view of a ceiling-mounted ventilation fan according to the present invention. Figure 2 is an exploded view of a ceiling-mounted ventilation fan according to this embodiment. In the following description, as necessary, the upward direction will be referred to as the vertically upward direction and the downward direction will be referred to as the vertically downward direction, based on the installed state of the ceiling-mounted ventilation fan 1. Furthermore, the downstream side of an air outlet 9, which will be described later, will be referred to as the downstream direction, and the upstream side will be referred to as the upstream direction.

[0015] The ceiling-mounted ventilation fan 1 includes a ventilation fan body 2, a louver 3, an adapter installation plate 13, and an adapter 5.

[0016] The ventilation fan body 2 includes a housing 4, a fan case 6, and a blower 7.

[0017] The housing 4 is a metal box having a hollow rectangular cylindrical shape. The housing 4 has a bottom surface 29, a top surface 10, and side surfaces 11.

[0018] Bottom surface 29 forms the bottom surface vertically below the hollow rectangular tubular shape of housing 4, based on the installation state of ceiling-mounted ventilation fan 1. Bottom surface 29 has a rectangular shape and is provided with air inlet 8 and bottom bent portion 22.

[0019] Inlet port 8 is an opening for drawing air into housing 4 when ceiling-mounted ventilation fan 1 is operating. Inlet port 8 is provided as a rectangular opening in bottom surface 29, and is provided across the entire surface of bottom surface 29, for example.

[0020] The bottom bent portion 22 has a hollow, generally rectangular shape with a rectangular opening, and the inner periphery thereof is provided so as to coincide with the outer periphery of the bottom surface 29 .

[0021] Top surface 10 forms the top surface at the vertically upper part of the hollow rectangular cylindrical shape of housing 4. Top surface 10 has a rectangular shape and is provided opposite bottom surface 29.

[0022] The side surfaces 11 form the four side surfaces of the hollow rectangular tubular shape of the housing 4. The side surfaces 11 have a rectangular shape, with one side connected to an end (one side) of the top surface 10 and the other side connected to an end (one side) of the bottom surface 29. The side surfaces 11 are arranged, for example, so that all four of the hollow rectangular tubular shape of the housing 4 have the same area. In other words, the four side surfaces 11 all have the same outer shape (periphery). The side surfaces 11 include one side surface 25.

[0023] One side surface 25 is one of the four side surfaces 11 that is provided facing an exhaust port 17 (described later), and includes an air outlet 9 and a hook portion 12.

[0024] The air outlet 9 is an opening for blowing air drawn into the housing 4 to the outside of the housing 4. The air outlet 9 is provided as a rectangular opening, for example, on one side surface 25 closer to the top surface than the center thereof.

[0025] The hook portion 12 is a member for tightly fitting the adapter installation plate 13 to the one side surface 25. The hook portion 12 is provided to protrude vertically upward from the top surface end of the one side surface 25. In other words, the hook portion 12 extends vertically upward from the top surface end of the one side surface 25 beyond the top surface 10, based on the installation state of the ceiling-mounted ventilation fan 1. The hook portion 12 includes a base portion 33 and a locking portion 23.

[0026] The base 33 is a flat plate having a substantially rectangular shape and is provided on the same plane as the one side surface 25. The base 33 is provided on the top surface side end of the one side surface 25, that is, on one side on the top surface side.

[0027] The locking portion 23 extends further substantially vertically upward from the upper side of the base 33 and is bent in the upstream direction from the extending tip of the base 33. In other words, the locking portion 23 is provided so that the locking portion 23 and the base 33 form an obtuse angle. Note that bending also includes curving. In other words, the locking portion 23 may be provided so that it curves in the upstream direction as it extends upward from the extending tip of the base 33. The locking portion 23 is provided to extend from the center of the top surface side end of one side surface 25 together with the base 33.

[0028] Fan case 6 protects blower 7 inside housing 4. Fan case 6 is provided so that its outer periphery coincides with the inner periphery of housing 4. In other words, fan case 6 is inscribed within housing 4. Fan case 6 includes air intake port 16 and exhaust port 17.

[0029] Air intake port 16 is an opening for drawing air into the inside of fan case 6. Air intake port 16 is provided opposite suction port 8.

[0030] Exhaust port 17 is an opening for discharging air from fan case 6. Exhaust port 17 is provided opposite air outlet 9.

[0031] The blower 7 includes blades 18 and a motor 19. The blower 7 is, for example, a centrifugal fan, and more preferably a sirocco fan.

[0032] The blades 18 are disposed inside the fan case 6. The blades 18 have a cylindrical shape and are disposed with the bottom surface of the cylinder facing the air inlet 8. The blades 18 have a plurality of fins on their outer circumferential surfaces and rotate in the circumferential direction of the cylinder to discharge air drawn in from the air inlet 16 to the air outlet 17. In other words, the blades 18 generate an airflow from the air inlet 8 toward the air outlet 9.

[0033] Motor 19 rotates the rotary shaft by power supply, thereby rotating blades 18 fixed to the rotary shaft. Motor 19 is fixed to the center of top surface 10, for example, with the rotary shaft protruding toward the inside of fan case 6.

[0034] The louvers 3 are rectangular and have multiple slits in the center to allow air to pass through. The outer periphery of the louvers 3 is aligned with the outer periphery of the bottom surface 29. The louvers 3 are engaged with the housing 4 by, for example, wires.

[0035] The adapter installation plate 13 is a rectangular member that positions the housing 4 and the adapter 5, and is provided downstream of the air outlet 9. The adapter installation plate 13 is disposed opposite one side surface 25 and is provided vertically above the one side surface 25 with an elongated length. In other words, the top surface end of the adapter installation plate 13 protrudes above the top surface end of the one side surface 25. The adapter installation plate 13 includes an upper end extension portion 15, a lower end extension portion 21, a ventilation opening 30, an engagement opening 20, and a reinforcing portion 24.

[0036] The upper end extension 15 is provided to extend in the upstream direction at the top surface side end of the adapter installation plate 13. The upper end extension 15 has a rectangular shape and faces the top surface 10.

[0037] The lower end extension 21 is provided to extend in the downstream direction at the top surface side end of the adapter installation plate 13. The lower end extension 21 has a rectangular shape and faces the bottom surface bent portion 22.

[0038] The ventilation opening 30 is a rectangular opening through which the air blown out from the air outlet 9 passes. The ventilation opening 30 is disposed so that its outer periphery coincides with the outer periphery of the air outlet 9.

[0039] The engagement opening 20 engages the upper part of the housing 4 with the upper part of the adapter installation plate 13 by inserting the hook portion 12. The engagement opening 20 is provided as a rectangular top opening in the center of the downstream end of the upper end extension 15. In addition to the above, the engagement opening 20 may also have a rectangular side opening provided in the center of the top end of the adapter installation plate 13. When a side opening is provided, the top opening and the side opening communicate with each other by sharing one side.

[0040] The reinforcing portion 24 suppresses bending of the adapter installation plate 13. The reinforcing portion 24 is provided to protrude in the downstream direction from at least one side end of the adapter installation plate 13, and may be formed by bending the side end of the adapter installation plate 13, for example.

[0041] The housing 4 and the adapter installation plate 13 are provided with a pair of fastening holes 26 .

[0042] Fastening holes 26 fasten the lower part of housing 4 to the lower part of adapter installation plate 13 by inserting a fastening member from inside housing 4. Fastening holes 26 are through holes, one of which is provided in the lower part of one side surface 25 and the other of which is provided in the lower part of adapter installation plate 13. Here, the through hole provided in one side surface 25 is referred to as fastening hole 26a, and the through hole provided in adapter installation plate 13 is referred to as 26b. Fastening holes 26a and 26b have the same size and are provided opposite each other.

[0043] The fastening hole 26a is provided near the vertically lower side of the air outlet 9.

[0044] The fastening hole 26b is provided near the vertically lower side of the ventilation opening 30.

[0045] The adapter 5 is a ventilation passage that connects the exhaust duct and the ventilation opening 30, and is provided downstream of the adapter installation plate 13. The adapter 5 includes a duct connection portion 14 and a housing connection portion 31.

[0046] The housing connection part 31 has a hollow rectangular shape with a rectangular opening. The housing connection part 31 is provided on the adapter installation plate 13 opposite the ventilation opening 30.

[0047] Duct connection part 14 has a generally cylindrical shape with a circular opening at the downstream end and a rectangular opening at the upstream end. Duct connection part 14 is arranged so that the outer periphery of the upstream end coincides with the inner periphery of housing connection part 31. For example, by connecting the downstream end of duct connection part 14 to the indoor end of an exhaust duct that connects the indoors and outdoors, it becomes possible to guide the air blown out from ventilation opening 30 to the outdoors.

[0048] Next, the structure of the ceiling built-in ventilation fan 1 will be described with reference to Fig. 3. Fig. 3 is a top view of the ceiling built-in ventilation fan according to this embodiment.

[0049] The engagement opening 20 further comprises an edge 28 .

[0050] The edge 28 comes into contact with the locking portion 23 when the hook portion 12 is inserted into the engagement opening 20. The edge 28 is one side of the upper opening of the engagement opening 20 on the upstream side.

[0051] The adapter installation plate 13 further includes a guide plate 27 .

[0052] The guide plate 27 has a rectangular flat plate shape and is provided so as to protrude in the upstream direction from at least one side end of the adapter installation plate 13. The guide plate 27 protrudes perpendicular to one side surface 25.

[0053] The lower end extension 21 further includes a screw hole 34 .

[0054] The screw holes 34 are provided as through holes with an oval diameter at equal intervals. In this embodiment, two screw holes 34 are provided.

[0055] Next, a method for connecting the adapter installation plate 13 installed on the ceiling and the housing 4 will be described with reference to Figures 4 and 5. Figure 4 is a side view of the ceiling-mounted ventilation fan according to this embodiment. Figure 5 is a schematic diagram showing the steps for connecting the housing 4 to the adapter installation plate 13 installed on the ceiling, in which the connection between the housing 4 and the adapter installation plate 13 is performed in steps (a) to (c). Here, it is assumed that an opening 35 is provided in the ceiling and a wooden frame 32 is arranged around the periphery of the opening 35.

[0056] First, the adapter installation plate 13 is fixed to the ceiling by abutting the upper surface of the lower end extension 21 against the underside of the wooden frame 32. This fixing is performed, for example, by lifting the adapter installation plate 13 vertically upward from below the opening 35 and placing it inside the opening 35 in the ceiling, and then passing screws through the screw holes 34 in the lower end extension 21 to the wooden frame 32.

[0057] Next, the housing 4 is moved from approximately vertically below the opening 35 to approximately vertically upward to connect to the adapter installation plate 13. In other words, the housing 4 is connected to the adapter installation plate 13 by moving from the underside of the ceiling through the opening 35 to the upper side of the ceiling. As shown in FIG. 5( a), when moving the housing 4, the top surface 10 is tilted downstream and the hook portion 12 is inserted into the engagement opening 20 at the top of the adapter installation plate 13. At this time, the housing 4 can be moved while sliding the side edge of one side surface 25 on the guide plate 27, thereby guiding the hook portion 12 into the engagement opening 20.

[0058] After the hook portion 12 has been inserted into the engagement opening 20, the tilt of the housing 4 is returned so that the adapter installation plate 13 and one side surface 25 are parallel, and the upper surface of the bottom bent portion 22 of the housing 4 abuts against the lower surface of the lower end extension 21 of the adapter installation plate 13. At this time, the outer periphery of the air outlet 9 and the outer periphery of the ventilation opening 30 are aligned. Furthermore, as shown in FIG. 5(b), the locking portion 23 of the hook portion 12 abuts against and engages with the edge 28 of the engagement opening 20, preventing the housing 4 from moving upstream.

[0059] 5(c), fastening members are inserted into a pair of fastening holes 26 on one side surface 25 and the lower part of adapter installation plate 13 to fasten them together. The fastening members are inserted from inside housing 4 into fastening holes 26 provided near and vertically below air outlet 9 and ventilation opening 30, fastening the lower part of housing 4 to the lower part of adapter installation plate 13. At this time, the fastening members apply a force to the lower part of housing 4 that urges the lower part of one side surface 25 in the downstream direction (toward adapter installation plate 13). In addition, a force is applied to the upper part of housing 4 that urges the upper part of one side surface 25 in the downstream direction (toward adapter installation plate 13), with the point of application being the contact point between locking portion 23 and edge portion 28.

[0060] Normally, a gap is likely to occur between the air outlet 9 and the ventilation opening 30, causing air leakage. Furthermore, in the prior art, with an upper engagement (engaging protrusion) and a lower engagement (cut-and-raised inclined piece), the distance from the upper engagement to the lower engagement is long, so the adhesion below the ventilation opening is low, and it cannot be said that the measures against air leakage below the ventilation opening are particularly sufficient.

[0061] According to this embodiment, by fastening the vicinity of the vertically lower part of the air outlet 9 and the ventilation opening 30 in addition to engaging the upper part of the housing 4, the outer periphery of the air outlet 9 and the outer periphery of the ventilation opening 30 can be tightly adhered to each other above and below the air outlet 9 and the ventilation opening 30. Therefore, air leakage occurring between the air outlet 9 and the ventilation opening 30 can be reduced.

[0062] Furthermore, according to this embodiment, it is possible to closely attach the adapter installation plate 13 to the housing 4 without providing a cut-and-raised inclined piece that protrudes downward from the ceiling near the opening 35. This eliminates the air blockage caused by the cut-and-raised inclined piece, reducing the possibility of reduced airflow and abnormal noise. Furthermore, because the cut-and-raised inclined piece does not protrude downward from the ceiling, the height of the louver 3 attached to the housing 4 can be freely designed.

[0063] Furthermore, with the above-described configuration, all connections between the adapter installation plate 13 and the housing 4 are made above the ceiling, so that the upper engagement (hook portion 12 and engagement opening 20) and the lower fastening (fastening hole 26 and fastening member) can be simultaneously confirmed above the ceiling, improving workability.

[0064] As described above, it is possible to provide a ventilation device that reduces the possibility of reduced air volume and abnormal noise, reduces design restrictions, and improves ease of installation. [Industrial Applicability]

[0065] The ventilation device according to the present invention can be applied to not only ceiling-mounted ventilation fans, but also air conditioners, blowers, and the like, which are ventilation devices in which separate parts constituting a flow path are connected together. [Explanation of symbols]

[0066] 1 Ceiling-mounted ventilation fan 2 Ventilation fan body 3 Louvers 4. Cabinet 5 Adapters 6 Fan case 7. Blower 8 Intake port 9 Air outlet 10 Top 11 Side 12 Hook 13 Adapter installation plate 14 Duct connection 15 Upper end extension 16 Air supply port 17 Exhaust port 18 Feather 19 Motor 20 engagement opening 21 Lower end extension 22 Bottom bent part 23 Locking part 24 Reinforcement 25 One aspect 26 Fastening hole 27 Signboard 28 Edge 29 Bottom 30 Ventilation opening 31 Housing connection part 32 Wooden Crate 33 Base 34 screw holes 35 Aperture 101 Ceiling-mounted ventilation fan 102 Ventilation fan body 103 Frame 104 Bottom opening 105 Intake Grille 106 Mounting plate 107 Pipe Fitting 108 Shutter plate 109 Duct 110 Ceiling 111 Opening 112 Cut and raised inclined piece 113 Tsuba 114 Cut and raised inclined piece 115 Section 116 Engagement protrusion 117 Screw 118 Blower 119 Vent 120 Tsuba 121 Tsuba 122 Cut and Raised Hole 123 Cut and Raise Hole

Claims

1. a housing formed of a bottom surface having an intake port and a bottom surface bent portion, a top surface opposite the bottom surface, and a plurality of side surfaces connected to the bottom surface and the top surface, the housing having an air outlet on one side surface; and an adapter installation plate having a ventilation opening opposite the air outlet, the adapter protruding downstream from the ventilation opening and being connected to an exhaust duct, The housing includes a hook portion, The hook portion includes a base portion and a locking portion, the base portion extends vertically upward from a top surface end of the one side surface having the air outlet, The adapter installation plate is an upper end extension portion that extends from an upper end above the top surface in an upstream direction that is the opposite direction to the downstream direction and faces the top surface; an engagement opening in at least the upper end extension portion for engaging with the hook portion; a lower end extension portion extending in the downstream direction and facing the bottom surface bent portion, the engagement opening includes an edge portion that is one side of the engagement opening on the upstream side, the locking portion is bent from an extending tip of the base portion in the upstream direction and is locked to the edge of the engagement opening to prevent the housing from moving in the upstream direction; the one side surface and the adapter installation plate have a pair of fastening holes at their lower portions for inserting fastening members thereinto to fasten them together; After the lower end extension portion is fixed to the frame of the ceiling opening, with the upper surface of the bottom bent portion abutting the lower surface of the lower end extension portion and the locking portion abutting the edge portion, the fastening member is inserted into the fastening hole from inside the housing to fasten the lower part of the one side surface and the lower part of the adapter installation plate, and the fastening member and the locking portion urge the one side surface toward the adapter installation plate, forming a ceiling-mounted ventilation device.

2. The adapter installation plate is a guide plate protruding in the upstream direction from at least one side end, The guide plate is The housing is slid along the guide plate to engage the hook portion with the engagement opening. The ceiling-embedded ventilation device according to claim 1 , wherein the housing and the adapter installation plate are connected by connecting the housing and the adapter installation plate together.

3. The adapter installation plate is The ceiling-mounted ventilation device according to claim 1, further comprising a reinforcing portion that protrudes from at least one side end in the downstream direction to prevent the adapter installation plate from bending.

4. The housing includes: The ceiling-mounted ventilation device according to claim 1 , further comprising a centrifugal fan that guides air from the air inlet to the air outlet.

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