AIR QUALITY


found in nature) made today with an estimated annual production rate in excess of a billion tonnes.


These chemicals are released to the


atmosphere during manufacture and use, and can subsequently travel vast distances. They are an inevitable part of our lives.


Poor air quality is not only bad for the health and wellbeing of people, but also for HVAC plant because it places unnecessary strain on components which can lead to energy inefficiencies and damaged componen ts which end up being replaced too frequently.


That’s why ensuring high quality air makes sense from a sustainability and operational point of view. It can save energy, reduce maintenance and lengthen the plant lifespan of equipment.


Indeed, although the arguments in favour of using less energy to perform the same task are well-rehearsed, they remain compelling. Good en ergy efficiency saves money an d, more importantly, contributes towards saving the planet.


Energy efficient ventilation incorporating th e r ight filters results in:


■ Lower operating costs – buildings that operate more efficiently have a reduced energy demand.


■ A smaller carbon footprint – by generating less energy, buildings that generate less energy also emit fewer greenhouse gases which improves environ mental performance. ■ A more sustainable reputation – being environmentally responsible will boost a company’s status as an ethical operator and help grow the profitability of the business. ■ Increased security – reducing energy demand helps protect UK energy security and means more resources for future generations.


■ Compliance with environmental legislation – following ever more stringent environmental legislation helps improve productivity as well as contributing to the health of the planet.


Selecting the right air filter for the job can be a big part of a company’s energy saving plan, but only if you are willing to invest in the best. Premium quality air filters capture particles out of the air and maintain efficient airflow two to three times longer than cheaper alternatives.


Although a high quality filter might be more expensive to buy than a low cost version, it still saves money in the long run. Indeed, even i f the lower quality filters were free of charge, they would still cost more to use over time. This is because the energy cost difference can be 20 times higher than the filter cost for an E rated filter, and only about three times the filter cost for an A+ rated filter.


A rule of thumb, for a typical installation running for half of the time over one year, is that one additional Pascal in pressure drop adds one euro per filter in extra energy cost. A cheap or badly design ed filter construction could add 50 Pascal compared to a well- engineered filter, even if it claims to have the same efficiency. In other words, it adds 50 euros to the annual energy bill, for every filter. But how do you select the best? The Eurovent energy rating, which came into force on 01 January 2018 and has just been updated, confirms the performance ratings of products according to international standards. In so doing, it gives installers confidence that equipment will operate in accordance with design specifications and the energy cost will be correctly stated.


All air filters are graded from A+ to E


using a coloured labelling system that many will be familiar with from its association with electrical white goods such as washing machines, fridges and freezers. Grade A+ represents the best energy consumption and E is the worst.


The classification is design ed to offer a better understanding of the annual energy


consumption, average efficiency and min imum efficiency.


Under Eurovent, energy efficiency demands have increased and many filters previously considered A+ have thus been downgraded to A. Specifiers selecting air filters to Eurovent’s new test standard will save money and be assured of maintaining healthy IAQ.


The Eurovent energy rating is now based on ISO16890:2016 test data, the international standard for particle filtration efficiency in buildin gs which came into force on 01 Jun e 2018. Participants in the Eurovent energy classification are obliged to supply a full ISO16890 test report as a basis on which to calculate a filter’s energy consumption. ISO16890 replaces two previous filter test standards – ASHRAE 52.2 in US and EN 779:2012 in Europe (both coexisting in Asia and the Middle East). There are important differences between ISO 16890 and the standards it supersedes.


ISO16890 is, for example, globally


applicable, eliminating confusion and invalid attempts to compare results between previous different standards. Indeed, the worldwide applicability will remove a barrier to trade – in today’s global world it is not unusual for engineers on a major construction project to be sitting in one country, the constructor in another, and the project itself being built in a third.


Plus, for the first time, ISO16980 tells people specifically what a filter does. For example, a typical air filter of a class that is going to make a difference to IAQ is defined in the new standard as ‘ePM1 60% minimum’ where ‘e’ means the removal efficiency of the filter, PM1 is the range of particulates, and 60% is the percentage of particles the filter will remove. Filters of this efficiency are available as a Eurovent A+ energy rating, the best combination of filter performance and economy.


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