CG INLET CEILING. Inlet ceiling with the laminar discharge flow for operating rooms
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1 CG INLET CEILING Inlet ceiling with the laminar discharge flow for operating rooms Pleasant climate controllable as required Economical operation due to the point protection principle Extremely low number of germs (< 10 germs/m 3 ) during the operation Laminar homogenous discharge flow Compact design highly adaptable to the existing structure
2 The CG inlet ceilings meet the highest hygienic and air-handling demands for the filtration and air distribution functions in medicine. Bacteria, viruses, and dust particles are separated before air enters rooms. The CG laminar ceiling for sterile air creates laminar, very homogenous discharge flow. The inner area of the inlet field is not thus affected by pollutants from the surrounding area. Sterile air is evenly distributed and flows at a rated velocity under the whole outlet field. If the project is executed expertly, the quiet flow of air achieved by the CG laminar ceiling for sterile air is not experienced as unpleasant draught. This laminar flow determines the clear area in the room with its size corresponding to the ceiling panel. The use of curtains at the air outlet or supporting flow is not required. CG air distribution principle The CG laminar ceiling for sterile air is a large-area air outlet covered with two layers of fine micro-fabric. This special arrangement facilitates the laminar discharge flow with a specified air velocity. The inductions and vortexes are limited to the maximum extent and occur actually only in the fringe areas. The disadvantages of perforated ceiling panels that, even with a closely spaced perforation, result in the occurrence of vortexes inside the flow field in consequence of inductions, do not occur with the CG laminar ceiling for sterile air. Perforated sheet metal CG laminar ceiling Due to an air velocity in the flow field of approximately 0.25 m/s and a CG special element for air distribution, impurities in the flow field, such as dust particles and germs, are directly drawn off. Characteristics of the flow behind the outlet with the perforated sheet metal as compared to the CG laminar ceiling A high level of cleanness of the area and an extremely low level of germs (less than 10 germs per m 3 ) are thus ensured in the area of the operating table during operations. 2
3 Level of germs The publication of Prof. Dr. K. H. Knoll of the Medical Centre for Hygiene and Medical Microbiology of the Phillips University in Marburg (at the Congress on Hygiene in 1986, authors: Steffen and Lühring (Figure 1) and the research of Thomas and Meierhans (Medical and Orthopaedic Technology, 1979, Figure 2)) presented the relevant data concerning the number of germs for the below mentioned systems of the distribution of entering air: The detailed research carried out by the Doctor of Medicine, Prof. J. Beckert, Director of the Institute of Hygiene of the University in Lübeck clearly shows that it is possible to maintain the required level of germs of < 10 germs/m 3 in the operating areas. In addition, it was proved that the laminar discharge flow provides an effective barrier against the unwanted importation of outdoor air impurities into the wound area. Figure 1: Operating rooms with ceiling outlets with the filters for microparticles: 200 germs/m 3 and more. Figure 2: Operating rooms with the additional equipment for the stabilising of flow, such as the supporting flows, outlets with openings or inclined shields: 70 to 150 germs/m 3. Figure 3: CG inlet ceiling: less than 10 germs/m 3. Measurement of the concentration of germs in the wound area Apart from the high purity of air, the low velocity of the laminar discharge flow was appreciated by Professor Beckert as especially positive: From the medical point of view, I have to highlight low velocities of air near patients that are beneficial in terms of thermal hygienic conditions. The inlet air exhaust system, CG type, is a well-proven structure used with excellent results in a number of operating rooms. 3
4 Dimensioning The size of the ceiling panel is determined according to the following criteria: - Total volume air flow available - Medical requirements resulting from various types of operations - Value of contamination between the secondary emissions in the room and the flow field The dimensioning should allow for an outlet velocity of air of 0.25 m/s; this ensures the direction-defined, non-inductive, and steady flow of entering air laminar airflow. The dimensions of the ceiling panel for ensuring the operating area given in the following table are thus given. The specific volume air flow amounts to 900 m 3 /h/m 2. The air renewal in the operating field for an hour is more than hundredfold. The adjustment of dimensions, supply channel routing, arrangement of filters for microparticles, position of the operating room lighting, and integration of the basic lighting according to the given layout should be agreed for each project individually. The laminar discharge flow cannot be guaranteed in the case of heating through the inlet ceiling due to physical reasons. The CG ceiling panel dimensions depending on the volume air flow Nominal size of Air quantity relating Initial pressure loss Number of N filter ceiling panel for air inlet to clean area in in Pa elements w x l in m m 3 /hour 1.20 x x x x x x x In order to maintain the required constant temperature in the working area of the operating table, we recommend that the temperature should be regulated by means of entering air. The entering air temperatures should differ from the room temperature by 1 to 2 C. With reduced temperatures of entering air, the outlet velocities lower than 0.25 m/s are possible. A larger quantity of air entering the room through the laminar ceiling for sterile air proportionally reduces pollution and thus also the concentration of germs in air. A respective enlargement of the ceiling panel in the operating room facilitates the unlimited performance of required types of operations with certainty that the surrounding area is the clean area. 4
5 System structure The inlet ceiling consists of the inlet air housing located in the intermediate ceiling, the connection for the supply air channel, H13 filters for microparticles according to EN 1822 (S/DIN ), CG laminar ceiling for sterile air with the opening for the operating lighting tripod, and integrated basic lighting. The following examples of arrangement show two typical installation layouts. The filters can be located on side, above the ceiling panel or separately. Side filters arrangement: Top filters arrangement: CG air outlet system for operating rooms 1 Filter for microparticles with the cover 2 Air inlet system 3 Pressure housing 4 CG laminar ceiling for sterile air 5 Operating lighting tripod 6 basic lighting (made to order) 7 Ceiling plates CG air outlet system for operating rooms 1 6 Filtrasepts, size 7 2 Air inlet system 3 Pressure housing 4 CG laminar ceiling for sterile air 5 Operating lighting tripod 6 Basic lighting (made to order) 7 Ceiling plates 5
6 Design, materials and maintenance The pressure housing is made of stainless steel no or other material as agreed. The filter housing is equipped with all elements required for securing and easy installation of filter elements and it is made of sheet metal painted with prime coating and powder synthetic varnish resistant to disinfectants or steel on request. The connection to the pipeline of inlet air is rectangular with a flange or round facilitating the installation of air-tight shutting flaps (according to DIN 1946). The CG laminar ceiling for sterile air is made of low combustible fabric made of plastic material and is connected with the precision stretcher frame made of aluminium profiles. This complete part is also removable downwards, ensuring thus access to the whole interior of the air housing and the possibility to replace the filter and to carry out disinfection. The air inlet element laminar ceiling for sterile air can be disinfected by both spraying and wiping. The ceiling opening for the operating lighting tripod is fitted close to the pressure housing. Due to that the CG laminar ceiling for sterile air transmits light, it is possible to integrate into the system the general diffused basic lighting pleasant for eyes and hygienically closed. One of the advantages of the system is that it is space saving. The filter elements are tested according to EN 1822 (DIN ). They are assembled from compact units with large filtration surfaces on the basis of the modern technique of the pleating of filter media. The elements are sealed with pressure screws in the test groove facilitating the testing, at any time, of the installation tightness as prescribed according to DIN The purity of air is ensured by the application of the filters for microparticles (HEPA). All the types of filters are based on the filter pleats made of a high-quality filter medium made of glass fibres. The arrangement of the filter pleat of the N ultrafilter in the V-shape pleating: The filter pleat with pleating with a height of 25 mm. Clean air Fouled air Filter pleat 6
7 Material Specifications, Documentation for Detailed Design Ord. no. Quantity Item: Unit price Total price CG inlet ceiling The CG entering air exhaust system suitable especially for use in operating rooms in order to create the vertical laminar flow of clean air, to be installed in hollow ceilings and various ceiling system versions, consists of: - The air-tight distribution housing made of the stainless material ( steel) with an easily dismountable transparent CG laminar ceiling for sterile air. The visible blanking frame made of aluminium. The hygienically safe opening for the operating lighting tripod located in the middle or as agreed. - Integrated housings of air filters (depending on the flow of entering air) made of steel sheet metal with baked varnish resistant to all standard disinfectants with integrated filters for microparticles. The groove for the leakage test of the filter installation and the flange for the pressure measurement with a shutting flap/without a shutting flap, with a pneumatic/electric drive. Made according to DIN 1946, section 4. PRODUCT: CG type Technical data: Air quantity : m 3 /hour Exhaust field (l x w) : m Height : mm Air velocity at outlet : 0.25 m/s Filter for microparticles Producer/pcs/type : Filtration class according to EN 1822 : H13 (DIN , class S) Initial pressure loss : Pa Delivery and installation, air purity control by means of a particle counter, including the completion certificate : With integrated basic lighting/without: 7
8 Typical areas of application of the CG inlet ceiling: , 5 pharmacy 3 1, 2, 3 operating rooms KS Klima-Service a.s. Na Trávníkách 1588 CZ Dobříš Tel.: Fax: info@ksklimaservice.com KS Klima-Service a.s. 10/2004/CG
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