Ventilation TR/19 – the classified approach
Gary Nicholls explains why the changes to the new B&ES TR/19 guidance document on Internal Cleanliness of Ventilation Systems were needed and why it means a cleaner, healthier future for buildings
Gary
Nicholls, managing director Swiftclean
, the new TR/19 (Second Edition 2013) guidance document: Internal Cleanliness of Ventilation Systems, from the BE&S was published. While TR/19 is perhaps the best known, and is still the leading industry guidance document, it was essential to ensure that guidance from both the B&ES and BSRIA were in line with the new British and European Standard BSEN:15780. Introduced in November 2011, this governs general ventilation duct- work for supply and extraction. Although BSEN:15780 has been with us for nearly three years, it hasn’t yet become very widely known. Both BSRIA and the B&ES have been keen to ensure that their recommendations are in agreement with those of BSEN:15780, and to embrace the progress that it offered. Last year, BSRIA issued its new BG49/2013 Commissioning of Air Systems guidance document and so the issuing of the latest edition of TR/19 by B&ES in July 2014 has brought all the leading industry advice into alignment.
BSEN:15780 provides a new and very practical framework which the B&ES was keen to embrace and incorporate into TR/19, as it will help us as an industry to improve the design, installation and hygiene maintenance of venti- lation systems as a whole. For the first time, we now have a high, medium and low classifica-
tion for ductwork. This spells the end of the ‘one size fits all’ approach for ductwork installation cleanliness and hygiene mainte- nance and instead allows us to consider ventilation systems according to their purpose. All ventilation systems must now be classified as high, medium or low in terms of their required cleanliness quality classification. And they must also start out at a set level of cleanliness according to whether they are high, medium or low. This may sound obvious, but unfortunately it hasn’t been the case in the past. All too often, when performing a ventilation system clean, our technicians have found clear indications that the system was not properly cleaned before commissioning; rather it was handed over with construc- tion debris and dust in the system before it began the task of refresh- ing the air within the property. Essentially systems were regularly handed over with rather too many miles on their hygiene clock. This was probably due in part to the fact that it wasn’t clear whose responsibility this was. Under the new TR/19, tests for system cleanliness are now required to ensure that each system is at the required cleanli- ness for its classification prior to commissioning. This will help to ensure that each ductwork system is clean and fit for purpose from the start.
Before and after examples of supply ductwork
16 | October 2014 | HVR
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