ontinuous and consistent airflow is essential to virtually every

commercial facility, making under-performing or unreliable fans unacceptable. In addition to reliability concerns,

inefficient fans can be a building’s biggest energy consumer. Given today’s economy and the increasing cause for environmental concern, designers should look to select EC plug fans, says Axair Fans. This will not only provide the necessary reliability, but will also provide optimum efficiency and flexibility. In most fan systems, a single fan is

selected for the required system and various methods of control are also installed to meet other operating points defined by the system duty, such as dampers or variable pitch blades.

construction, offering advantages over conventional technology. It is equally suitable for new and existing ventilation systems. In addition to being compact and flexible, the ECFanGrid is easy to clean, replace and maintain, while expelling low noise and delivering uniform air stream. Running fans in parallel allows for

redundancy, which is designed to improve reliability and consistency. For example, if one fan fails within the fan grid only that portion of the airflow is lost, unlike single fan systems where the entire air handler goes offline. Moreover, the loss of airflow from one plug fan can be offset by increasing the speed of the remaining fans; this can be achieved automatically in conjunction with the building’s management system. The number of plug fans in each ECFanGrid system can vary according to the airflow requirements. For example, in a wall of nine fans in a three-by-three configuration, where only seven fans may be required for normal operations to deliver the designed duty, the eighth and ninth space can be blanked off with a plate. If the demands on the AHU increase through building expansion, for instance, the blanking plates can be removed and one or two fans added to the grid to meet the new requirements. Unlike a traditional belt

drive unit that covers a large floor space, the ECFanGrid is completely free of the floor. This means that maintaining the hygiene of the AHU is quicker, simpler and more effective. There are also no belt drives to degenerate over

In some instances, it is

advantageous to use more than one fan in a system, for example, when it is necessary for the required operating range of the system to include multiple plug fans running closer to their peak efficiencies, instead of one large fan controlled over a wide operating range. Multiple fans for capacity control may be more economical in a commercial setting if the cost of operation is critical. Working with supply partner,

Rosenberg, Axair Fans has developed an energy efficient solution to refurbishing old and outdated ventilation systems, such as air handling units with an ECFanGrid. An ECFanGrid consists of several

modular backward curved centrifugal fans or plug fans arranged in a grid


time, and component failure is quickly dealt with, due to the modular nature of the ECFanGrid. Fan Grids are ideally suited for retrofit

AHU projects, particularly where a single large radial fan is being replaced. Case studies have shown that there is

the potential to significantly lower noise when using an ECFanGrid. There are two major advantages to attenuate noise. First, the noise spectrum of smaller impellers contains higher frequencies, thus the wave lengths are shorter, allowing for the use of shorter attenuators. Second, the required length of the fan section in a typical air handling unit using a single large radial fan can be reduced dramatically, in some cases up to 50 per cent.


Rotronic has developed the Rotronic Monitoring System (RMS), which checks, records and visualises all required measurements in one system, making them available to the user exactly as required. The data can be retrieved from anywhere, at any time,

by PC, Mac, tablet or smartphone. The system offers a high level of performance, flexibility and versatility, yet is easy to set up and operate. The RMS provides one complete monitoring solution,

instead of many fragmented and complex systems working in isolation. The heart of the system is server software with a secure database. It records all data and events, generating a range of alerts or warnings when customer defined criteria are breached. The RMS data loggers transmit the measured values to the software via wireless or LAN communication. Rotronic has prepared a short video explaining the RMS,

which can be found on the company’s YouTube channel. The modular system is suitable for use in laboratories

and cleanrooms, as well as production and manufacturing processes, stability cabinets and storage facilities throughout the food, pharmaceutical, biotechnology, cosmetic and many other industries. It is highly suitable for monitoring data reliably for

building management systems, across industry, museums and art galleries, archive stores and during the transportation of valuable products that are sensitive to variations in humidity and temperature levels. Data loggers record all data continuously with temperature, humidity and many other parameters. Third-party devices and existing systems can be integrated easily, making the RMS extremely flexible and allowing trouble-free expansion at any time. The system sends error messages and alerts by voice call, email or SMS text messages, as well as smartphone apps. Real time data is guaranteed, which gives peace of

mind and saves costs. Thanks to the server database and software, data security is ensured by https protocols, regardless of the location or terminal device. It is also possible to encrypt all data. The RMS meets all the regulatory requirements of

GxP, FDA Annex 11 and 21 CFR 11.


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