Sand wind filtering air channel and assembly type communication machine room

Abstract

The invention relates to the technical field of air filtering, in particular to a sand wind filtering air channel and an assembly type communication machine room, the sand wind filtering air channel comprises a shell and a filter element rotationally arranged in the shell, an air inducing mechanism is arranged at one end of the shell and matched with the filter element, and the sand wind filtering air channel further comprises an annular brush and an inclined guide box; the annular brush is coaxially arranged on the outer wall of the filter element in a sleeving mode and slides in the filter element in the length direction of the shell, a reciprocating assembly matched with the annular brush and the air inducing mechanism is arranged on the shell, and a knocking assembly matched with the filter element is arranged on the shell. All moving parts are driven by the same power source, so that the energy consumption and the maintenance cost are reduced, the equipment has the characteristics of automatic cleaning and low maintenance in a sandstorm environment, the service life of the filter element is prolonged, and the working reliability and the environmental adaptability of the whole machine are improved.

Description

A sand-filtering air duct and a prefabricated communication equipment room Technical Field

[0001] This invention relates to the field of air filtration technology, specifically to a sand and dust filtration duct and a prefabricated communication equipment room. Background Technology

[0002] In deserts, Gobi, and areas prone to sandstorms, communication infrastructure has long faced severe challenges from harsh natural environments. High concentrations of dust particles in the air not only affect the heat dissipation performance of communication equipment but also easily cause wear and short circuits in precision electronic components, seriously threatening the stable operation of communication systems. Therefore, prefabricated communication equipment rooms deployed in these areas must be equipped with efficient and reliable sand filtration systems to ensure the cleanliness of the internal environment.

[0003] Currently, most sand and dust filtration devices used in communication equipment rooms employ a static filtration mode, where air is passively filtered through fixed filter elements. This structure can meet basic needs in environments with low sand and dust concentrations, but under extreme weather conditions such as sandstorms, sand and gravel easily accumulate rapidly on the filter element surface, forming a hardened layer. This leads to rapid blockage of the filtration channels and a sharp increase in ventilation resistance. To restore filtration performance, frequent manual replacement or cleaning of the filter elements is usually required, which not only increases maintenance costs but also exposes communication equipment to the risk of overheating due to ventilation interruptions.

[0004] Furthermore, existing automatic dust removal devices often employ independent drive systems, cleaning filter elements through vibration or backflushing. While these solutions can extend the filter element's lifespan to some extent, they suffer from complex structures, high energy consumption, and incomplete dust removal. Moreover, vibration-based dust removal can easily damage the filter element, shortening its service life. For prefabricated communication equipment rooms, their modular and rapid deployment characteristics require supporting equipment to possess compact structures, low maintenance, and high reliability, which existing sand and dust filtration devices struggle to meet. Summary of the Invention

[0005] The purpose of this invention is to provide a sand and dust filtration duct and a prefabricated communication equipment room to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a sand-filtering air duct, comprising a housing and a filter element rotatably disposed inside the housing. One end of the housing is provided with an air-guiding mechanism, which cooperates with the filter element. When the air-guiding mechanism operates, it drives the filter element to rotate and draws in outside air through the other end of the housing, which then filters the air before discharging it from the other end of the housing. The duct also includes an annular brush and an inclined guide box. The annular brush is coaxially sleeved on the outer wall of the filter element and slides inside the housing along its length. The housing is provided with... The reciprocating assembly, which works in conjunction with the annular brush and the air-guiding mechanism, drives the annular brush to reciprocate along the outer wall of the filter element during the operation of the air-guiding mechanism. The inclined guide box is fixedly installed at the bottom of the housing and is connected to the housing. A dust collection box is fixedly installed at one end of the inclined guide box. During the movement of the annular brush and the rotation of the filter element, the sand and gravel on the outer wall of the filter element will be swept into the inclined guide box. The housing is provided with a striking assembly that works in conjunction with the filter element. When the filter element rotates, the striking assembly will strike the bottom of the inclined guide box, allowing the sand and gravel to slide smoothly into the dust collection box.

[0007] As described above, the wind and sand filtration air duct includes a through pipe and an impeller. The through pipe is fixedly installed on the outer shell and is sealed and connected to one end of the filter element. The impeller is coaxially rotatably installed inside the through pipe. A motor is fixedly installed on the through pipe, and the output end of the motor is coaxially fixedly connected to the impeller.

[0008] As described above, the sand and dust filtration duct has a rotating rod inside the outer shell that rotates along its length. A gear is fixedly mounted on the rotating rod. A gear ring is coaxially fixed at one end of the filter element. The gear and the gear ring mesh with each other.

[0009] As described above, the sand and dust filtration duct has the following configuration: a driving pulley is coaxially fixed on the impeller, and a driven pulley is fixed on the rotating rod. The driving pulley and the driven pulley are connected by a toothed belt.

[0010] As described above, the sand and dust filtration duct includes a collar and steel balls. The collar is fixedly mounted on the annular brush and slidably mounted on the outer wall of the rotating rod. The steel balls are rolled and embedded in the inner wall of the collar. The outer wall of the rotating rod is provided with an annular track groove along its length, and the steel balls are also rolled and embedded in the annular track groove.

[0011] As described above, the sand and dust filtration duct includes a drive shaft and a drive rod. The drive shaft is horizontally rotatable inside the housing, and the drive rod is vertically rotatable on the housing. A second gear ring is coaxially fixed at the other end of the filter element, and a second gear that meshes with the second gear ring is fixedly mounted on the drive shaft.

[0012] As described above, the sand and dust filtration duct has a drive bevel gear fixedly mounted on the drive shaft and a driven bevel gear fixedly mounted at the top of the drive rod. The drive bevel gear and the driven bevel gear mesh with each other.

[0013] As described above, the sand and dust filtration duct includes a support and a swing arm. The support is fixedly mounted on the outer wall of the housing. A reversing shaft is horizontally rotatably mounted on the support. A driving bevel gear is fixedly mounted at the bottom end of the transmission rod. A driven bevel gear that meshes with the driving bevel gear is fixedly mounted at one end of the reversing shaft. A rotating shaft is horizontally rotatably mounted on the support. A large bevel gear is fixedly mounted at the other end of the reversing shaft. A small bevel gear that meshes with the large bevel gear is fixedly mounted on the rotating shaft.

[0014] As described above, the sand and dust filtration duct has the following features: a disc is fixedly mounted on the rotating shaft; one end of the swing rod is rotatably connected to the bracket; a rubber hammer is fixedly mounted on the other end of the swing rod; a protruding post is eccentrically fixed on the disc; a sliding groove is provided on the swing rod along its length; the protruding post is located in the sliding groove and slides with each other; and a baffle is detachably mounted on the bottom of the dust collection box.

[0015] A sand-filtering air duct as described above, characterized in that it is applied to a prefabricated communication equipment room.

[0016] Compared with the prior art, the beneficial effects of this invention are as follows: By connecting the air-driving mechanism with the filter element drive, the filtration operation is synchronized with the rotation of the filter element; the power of the air-driving mechanism is synchronously transmitted to the annular brush through the reciprocating component, and the brush moves axially during the rotation of the filter element, forming a comprehensive dynamic cleaning of the outer surface of the filter element, effectively avoiding the accumulation and caking of sand and gravel on the surface of the filter material, ensuring the unobstructed filtration channel and the stability of filtration efficiency; the sand and gravel swept off are guided and collected by the inclined guide box, and at the same time, the power of the filter element's rotation is used to periodically tap the bottom of the guide box through the striking component, effectively preventing dust from being trapped and blocked on the inclined surface, ensuring that the particles slide smoothly into the dust collection box under the action of gravity, realizing the automatic collection and centralized treatment of dust; the overall structure organically integrates the functions of air-driving, filtration, dust cleaning, and dust collection, and all moving parts are driven by the same power source, reducing energy consumption and maintenance costs, and enabling the equipment to have the characteristics of automatic cleaning and low maintenance in windy and sandy environments, extending the service life of the filter element, and improving the working reliability and environmental adaptability of the whole machine. Attached Figure Description

[0017] Figure 1 is a schematic diagram of the overall structure of the sand and dust filtration duct.

[0018] Figure 2 is a cross-sectional view of the outer shell and the connecting pipe in the sand and dust filtration duct.

[0019] Figure 3 is an enlarged view of point A in Figure 2.

[0020] Figure 4 is a cross-sectional view of the outer shell, through-tube, and collar in the sand and dust filter air duct.

[0021] Figure 5 is an enlarged view of point B in Figure 4.

[0022] Figure 6 is a schematic diagram of the rotating rod and annular track groove in the sand and dust filtration air duct.

[0023] Figure 7 shows a cross-sectional view of the outer shell, inclined guide box, and dust collection box in the sand and dust filtration air duct.

[0024] Figure 8 is an enlarged view of point C in Figure 7.

[0025] Figure 9 is a schematic diagram of the overall structure of the sand and dust filtration duct from another perspective.

[0026] Figure 10 is an enlarged view of point D in Figure 9.

[0027] Figure 11 is a schematic diagram showing the disassembly of the dust collection box and baffle in the sand filtration air duct.

[0028] In the diagram: 1. Outer shell; 2. Filter element; 3. Annular brush; 4. Inclined guide box; 5. Dust collection box; 501. Baffle; 6. Pipe; 7. Impeller; 8. Motor; 9. Rotating rod; 901. Annular track groove; 10. Gear No. 1; 11. Gear ring No. 1; 12. Driving pulley; 13. Driven pulley; 14. Toothed belt; 15. Collar; 16. Steel ball; 17. Drive shaft; 18. Drive rod; 19. Gear ring No. 2; 20. Gear No. 2; 21. Driving bevel gear; 22. Driven bevel gear; 23. Support; 24. Swing rod; 2401. Slide groove; 25. Reversing shaft; 26. Driving bevel gear; 27. Driven bevel gear; 28. Rotating shaft; 29. ​​Large bevel gear; 30. Small bevel gear; 31. Disc; 32. Rubber hammer; 33. Protruding column. Detailed Implementation

[0029] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0030] Please refer to Figures 1-11. As an embodiment of the present invention, a sand-filtering air duct includes a housing 1 and a filter element 2 rotatably disposed inside the housing 1. One end of the housing 1 is provided with an air-guiding mechanism, which cooperates with the filter element 2. When the air-guiding mechanism operates, it drives the filter element 2 to rotate, drawing in outside air through the other end of the housing 1, filtering it through the filter element 2, and then discharging it from one end of the housing 1. The duct also includes an annular brush 3 and an inclined guide box 4. The annular brush 3 is coaxially sleeved on the outer wall of the filter element 2 and slides inside the housing 1 along its length. The housing 1 is provided with... The annular brush 3 and the reciprocating assembly that cooperates with the air-guiding mechanism drive the annular brush 3 to reciprocate along the outer wall of the filter element 2 during the operation of the air-guiding mechanism. The inclined guide box 4 is fixedly installed at the bottom of the outer shell 1 and is connected to the outer shell 1. A dust collection box 5 is fixedly provided at one end of the inclined guide box 4. During the movement of the annular brush 3 and the rotation of the filter element 2, the sand and gravel on the outer wall of the filter element 2 will be swept into the inclined guide box 4. The outer shell 1 is provided with a striking assembly that cooperates with the filter element 2. When the filter element 2 rotates, the striking assembly will strike the bottom of the inclined guide box 4, so that the sand and gravel can smoothly slide into the dust collection box 5.

[0031] In this embodiment, the air-drawing mechanism is the core power source, achieving simultaneous filtration and dust removal through mechanical linkage. When the air-drawing mechanism starts running, it draws in outside air from one end of the outer shell 1, allowing the airflow to pass through the filter element 2 for filtration and then exiting from the other end. Simultaneously, it drives the filter element 2 to continuously rotate inside the outer shell 1 through transmission. While the air-drawing mechanism operates, it forms a power transmission with the reciprocating assembly, causing the reciprocating assembly to drive the annular brush 3 to reciprocate along the axial direction of the outer wall of the filter element 2. At this time, the rotational motion of the filter element 2 and the axial motion of the annular brush 3... The moving part forms a composite cleaning action. The annular brush 3 performs a full-range dynamic cleaning of the outer wall of the rotating filter element 2, brushing off the sand and gravel attached to its surface. The cleaned sand and gravel fall into the inclined guide box 4 connected to the bottom of the outer shell 1 under the action of gravity. At the same time, the rotation of the filter element 2 and the knocking component form a mechanical cooperation. As the filter element 2 rotates, the knocking component performs periodic knocking vibration on the bottom of the inclined guide box 4. This vibration, combined with the inclined structure of the inclined guide box 4, allows the sand and gravel to slide smoothly to one end of the dust collection box 5, ultimately achieving automatic dust collection.

[0032] As a further embodiment of the present invention, the air-guiding mechanism includes a through pipe 6 and an impeller 7. The through pipe 6 is fixedly mounted on the outer casing 1 and is sealed and connected to one end of the filter element 2. The impeller 7 is coaxially rotatably mounted inside the through pipe 6. A motor 8 is fixedly mounted on the through pipe 6, and the output end of the motor 8 is coaxially fixedly connected to the impeller 7. A rotating rod 9 is rotatably mounted inside the outer casing 1 along its length direction. A first gear 10 is fixedly mounted on the rotating rod 9. A first gear ring 11 is coaxially fixedly mounted on one end of the filter element 2. The first gear 10 and the first gear ring 11 mesh with each other. A driving pulley 12 is coaxially fixedly mounted on the impeller 7, and a driven pulley 13 is fixedly mounted on the rotating rod 9. The driving pulley 12 and the driven pulley 13 are connected by a toothed belt 14.

[0033] In this embodiment, please refer to Figures 2 and 3. After the motor 8 is started, its output end directly drives the impeller 7 to rotate coaxially in the through pipe 6. The rotation of the impeller 7 generates an airflow suction effect, which draws in outside air from the other end of the outer shell 1. After passing through the filter element 2 and completing filtration, the air is discharged from one end of the through pipe 6. At the same time, the driving pulley 12, which is coaxially fixed on the impeller 7, rotates accordingly. The power is transmitted to the driven pulley 13 through the toothed belt 14, causing the rotating rod 9, which is coaxially fixed with the driven pulley 13, to rotate along its length direction inside the outer shell 1. When the rotating rod 9 rotates, it drives the first gear 10 on it to rotate synchronously. The first gear 10 meshes with the first gear ring 11, which is coaxially fixed at one end of the filter element 2, thereby driving the filter element 2 to rotate inside the outer shell 1.

[0034] As a further embodiment of the present invention, the reciprocating assembly includes a collar 15 and a steel ball 16. The collar 15 is fixedly disposed on the annular brush 3 and slidably sleeved on the outer wall of the rotating rod 9. The steel ball 16 is rolled and embedded in the inner wall of the collar 15. The outer wall of the rotating rod 9 is provided with an annular track groove 901 along its length direction, and the steel ball 16 is also rolled and embedded in the annular track groove 901.

[0035] In this embodiment, please refer to Figures 4, 5 and 6. When the rotating rod 9 rotates, the steel ball 16, which is fitted into the annular track groove 901 on its outer wall, rolls along the groove wall. Since the inner wall of the collar 15 forms a rolling fit with the steel ball 16 and the collar 15 is fixedly connected to the annular brush 3, the contour curve of the annular track groove 901 pushes the steel ball 16 and the collar 15 to move along the axial direction of the rotating rod 9. As the rotating rod 9 continues to rotate, the steel ball 16 makes periodic axial reciprocating motion under the guidance of the annular track groove 901, thereby causing the collar 15 to drive the annular brush 3 to slide back and forth along the outer wall of the filter element 2.

[0036] As a further embodiment of the present invention, the striking assembly includes a drive shaft 17 and a drive rod 18. The drive shaft 17 is horizontally rotatably disposed inside the outer casing 1, and the drive rod 18 is vertically rotatably disposed on the outer casing 1. A second gear ring 19 is coaxially fixedly disposed at the other end of the filter element 2. A second gear 20 that meshes with the second gear ring 19 is fixedly disposed on the drive shaft 17. A driving bevel gear 21 is fixedly disposed on the drive shaft 17, and a driven bevel gear 22 is fixedly disposed at the top end of the drive rod 18. The driving bevel gear 21 and the driven bevel gear 22 mesh with each other. The striking assembly also includes a bracket 23 and a swing rod 24. The bracket 23 is fixedly disposed on the outer wall of the outer casing 1, and a reversing shaft 25 is horizontally rotatably disposed on the bracket 23. The bottom end of the drive rod 18 is fixed... The dust collection box 5 is equipped with a driving bevel gear 26, and a driven bevel gear 27 that meshes with the driving bevel gear 26 is fixedly mounted at one end of the reversing shaft 25. A rotating shaft 28 is horizontally rotatably mounted on the support 23, and a large bevel gear 29 is fixedly mounted at the other end of the reversing shaft 25. A small bevel gear 30 that meshes with the large bevel gear 29 is fixedly mounted on the rotating shaft 28. A disc 31 is fixedly mounted on the rotating shaft 28. One end of the swing rod 24 is rotatably connected to the support 23, and a rubber hammer 32 is fixedly mounted on the other end of the swing rod 24. A protruding post 33 is eccentrically fixed on the disc 31. A sliding groove 2401 is provided on the swing rod 24 along its length direction. The protruding post 33 is located in the sliding groove 2401 and slides with each other. A baffle 501 is detachably mounted at the bottom of the dust collection box 5.

[0037] In this embodiment, please refer to Figures 7-11. When the filter element 2 rotates, the second gear ring 19, which is coaxially fixed at its other end, rotates accordingly. Through meshing with the second gear 20, it drives the transmission shaft 17 to rotate horizontally inside the housing 1. The rotation of the transmission shaft 17 changes the transmission direction through the meshing of the driving bevel gear 21 and the driven bevel gear 22, so that the vertically arranged transmission rod 18 rotates on the housing 1. The driving bevel gear 26 at the bottom of the transmission rod 18 meshes with the driven bevel gear 27 at one end of the reversing shaft 25, converting the vertical rotation into the horizontal rotation of the reversing shaft 25 on the bracket 23. The large bevel gear 29 at the other end of the reversing shaft 25 meshes with the small bevel gear 30 on the rotating shaft 28, changing the transmission direction again and driving the rotating shaft 28 to rotate. The rotating shaft 28 drives the disc 31 to rotate synchronously. The eccentrically fixed protrusion 33 on the disc 31 slides in the slide groove 2401, pushing the swing arm 24 to swing periodically relative to the bracket 23, so that the rubber hammer 32 at the other end of the swing arm 24 repeatedly hits the bottom of the inclined guide box 4, so that the sand and gravel in the inclined guide box 4 can slide smoothly into the dust collection box 5. By removing the baffle 501, the sand and gravel collected in the dust collection box 5 can be transferred.

[0038] A sand-filtering air duct as described above, characterized in that it is applied to a prefabricated communication equipment room.

[0039] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0040] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A sand and dust filtration duct, comprising a housing (1) and a filter element (2) rotatably disposed inside the housing (1), characterized in that, One end of the outer shell (1) is provided with an air-guiding mechanism, which cooperates with the filter element (2). When the air-guiding mechanism is running, it will drive the filter element (2) to rotate and draw outside air into the outer shell (1) through the other end of the outer shell (1), and then discharge it from one end of the outer shell (1) after being filtered by the filter element (2). It also includes an annular brush (3) and an inclined guide box (4). The annular brush (3) is coaxially sleeved on the outer wall of the filter element (2) and slides inside the outer shell (1) along the length direction. The outer shell (1) is provided with reciprocating components that cooperate with the annular brush (3) and the air-guiding mechanism respectively. When the air-guiding mechanism is running... During the process, the reciprocating component will drive the annular brush (3) to move back and forth along the outer wall of the filter element (2); the inclined guide box (4) is fixedly installed at the bottom of the outer shell (1) and connected to the outer shell (1). A dust collection box (5) is fixedly provided at one end of the inclined guide box (4). During the movement of the annular brush (3) and the rotation of the filter element (2), the sand and gravel on the outer wall of the filter element (2) will be swept into the inclined guide box (4). A knocking component that cooperates with the filter element (2) is provided on the outer shell (1). When the filter element (2) rotates, the knocking component will knock on the bottom of the inclined guide box (4) so ​​that the sand and gravel can slide smoothly into the dust collection box (5).

2. The wind and sand filtration air duct according to claim 1, characterized in that, The air intake mechanism includes a through pipe (6) and an impeller (7). The through pipe (6) is fixedly installed on the outer shell (1) and is sealed and connected to one end of the filter element (2). The impeller (7) is coaxially rotatably installed inside the through pipe (6). A motor (8) is fixedly installed on the through pipe (6), and the output end of the motor (8) is coaxially fixedly connected to the impeller (7).

3. The wind and sand filtration air duct according to claim 2, characterized in that, Inside the outer shell (1), a rotating rod (9) is rotatably arranged along its length. A first gear (10) is fixedly arranged on the rotating rod (9). A first gear ring (11) is coaxially fixed at one end of the filter element (2). The first gear (10) and the first gear ring (11) mesh with each other.

4. The wind and sand filtration air duct according to claim 3, characterized in that, A drive pulley (12) is coaxially fixed on the impeller (7), and a driven pulley (13) is fixed on the rotating rod (9). The drive pulley (12) and the driven pulley (13) are connected by a toothed belt (14).

5. The wind and sand filtration air duct according to claim 3, characterized in that, The reciprocating assembly includes a collar (15) and a steel ball (16). The collar (15) is fixedly mounted on the annular brush (3) and the collar (15) is slidably mounted on the outer wall of the rotating rod (9). The steel ball (16) is rolled and embedded in the inner wall of the collar (15). The outer wall of the rotating rod (9) is provided with an annular track groove (901) along its length direction, and the steel ball (16) is also rolled and embedded in the annular track groove (901).

6. The wind and sand filtration air duct according to claim 1, characterized in that, The striking assembly includes a drive shaft (17) and a drive rod (18). The drive shaft (17) is horizontally rotatably disposed inside the housing (1), and the drive rod (18) is vertically rotatably disposed on the housing (1). A second gear ring (19) is coaxially fixedly disposed at the other end of the filter element (2), and a second gear (20) is fixedly disposed on the drive shaft (17) and meshes with the second gear ring (19).

7. The wind and sand filtration air duct according to claim 6, characterized in that, A drive bevel gear (21) is fixedly mounted on the drive shaft (17), and a passive bevel gear (22) is fixedly mounted on the top end of the drive rod (18). The drive bevel gear (21) and the passive bevel gear (22) mesh with each other.

8. A sand-filtering air duct according to claim 6, characterized in that, The striking assembly also includes a bracket (23) and a swing arm (24). The bracket (23) is fixedly mounted on the outer wall of the housing (1). A reversing shaft (25) is horizontally rotatably mounted on the bracket (23). A driving bevel gear (26) is fixedly mounted at the bottom end of the transmission rod (18). A driven bevel gear (27) that meshes with the driving bevel gear (26) is fixedly mounted at one end of the reversing shaft (25). A rotating shaft (28) is horizontally rotatably mounted on the bracket (23). A large bevel gear (29) is fixedly mounted at the other end of the reversing shaft (25). A small bevel gear (30) that meshes with the large bevel gear (29) is fixedly mounted on the rotating shaft (28).

9. A sand-filtering air duct according to claim 8, characterized in that, A disc (31) is fixedly mounted on the rotating shaft (28). One end of the swing rod (24) is rotatably connected to the bracket (23). A rubber hammer (32) is fixedly mounted on the other end of the swing rod (24). A protruding post (33) is eccentrically fixed on the disc (31). A sliding groove (2401) is provided on the swing rod (24) along its length direction. The protruding post (33) is located in the sliding groove (2401) and slides with each other. A baffle (501) is detachably provided at the bottom of the dust collection box (5).

10. A sand-filtering air duct as described in any one of claims 1-9, characterized in that, It is used in prefabricated communication equipment rooms.

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