PIPES AND DUCTWORK


for, and treat, the various biological pathogens. This states that there should be ‘reasonable provision’ for safe and comfortable environments. The regulations also refer to keeping air handling units (AHUs) and fan coils (FCUs) – as well as other system components such as silencers, dampers, turning vanes etc. – clean for the same reasons as keeping the duct clean. On top of all this, as ducts get dirty the airflow performance and energy efficiency of the system can both reduce.


for, and treat, the various biological pathogens. This states that there should be ‘reasonable provision’ for


r safe and comfortable environments s.


The regulations also refer to keeping air handling units (AHUs) and fan coils (FCUs) – as well as other system components such as silencers, dampers, turning vanes etc. – clean for the same reasons as keeping the duct c On top of all this, as ducts get dirty the airflow performan efficiency of the system can both reduce.


ce and energy clean.


Obviously, kitchen extract ducts are subject to specialised focus due to more acute fire risks and insurance requirements, but what about the condition of all the other ducts?


Obviously, kitchen extract ducts are subject to specialised acute fire risks and insurance requirements, but what about t other ducts?


Given the weight of legislation and the fact that there are companies avai able to perform the necessary company or direct for the


ppl py tasks on behal


the condition of all the focus due to more


Given the weight of legislation and the fact that there are specialist cleaning companies available to perform the necessary tasks on behalf of the HVAC company or direct for the FM provider or the end client, why is duct cleanliness and its impact on the occupants via IAQ no receiving more prominence in our industry? During installation, access only needs to be made available for access to system components, not necessarily the ducting itself. This is the remit of the cleaning contractor that will follow on later. But, what if the client or occupier doesn’t realise the need exists for cleaning the ducts? What if they know, but decide to continually put it off due to cost or the unwanted disruption? What if the duct is never going to be accessible? Think of the many HRV/MVHR and ERV systems installed in residential ceilings throughout the UK & Ireland. What can be done to help prevent the situation arising in the first place? Keeping the filters clean is one obvious answer and there are improvements happening in this area with air flow sensors available to email an alarm when filters start to clog up and require maintenance.


f of the HVAC specialist cleaning


e FM provider or the end client, why is duct cleanliness and


its impact on the occupants via IAQ no receiving more promi nence in our industry? During installation, access only needs to be made available for access to system components, not necessarily the ducting itself. This is the remit of the cleaning contractor that will follow on later. But, what if the client or occupier doesn’t realise the need exists for cleaning the ducts? What if they know, but decide to continually put it off due to cost or the unwanted disruption?


What if the duct is never going to be accessible? Think of the many HRV/MVHR and ERV systems installed in residential ceilings throughout the UK & Ireland. What can be done to help prevent the situation arising in the first place? Keeping the filters clean is one obvious answer and there are improvements happening in this area with air flow sensors available to email an alarm when filters start to clog up and requ


w uire maintenance.


Heavier filtration in itself can only be part of the answer do to the decrease in energy efficiency it can cause.


Heavier filtration in itself can only be part of the answer d o to the decrease in energy efficiency it can cause.


UV lamps help keep the air handling unit clean from microbes which reduces the potential for microbes in the duct.


UV lamps help keep the air handling unit clean from microbes which reduces the potential for microbes in the duct.


Also, the colder the off coil temperature in the system (and the lower the relative humidity), the less chance that microbes will grow in the first place. This applies to AHUs/FCUs as well as the ducts.


Also, the colder the off coil temperature in the system (and the lower the relative humidity), the less chance that microbes will grow in the first place. This applies to AHUs/FCUs as well as the ducts. High


Hi her velocity airflows can prevent dust and dirt build up iih n the duct simply l


by virtue of the faster flowing air holding any sediment in suspension. Everyone understands that a fast flowing river will hold its sediment in the water while further downstream when the flow becomes much reduced, the sediment is


‘friend’ instead? What if we turn it into a delivery system for positive IAQ? We can use the items mentioned above and combine them with purification that actively removes the gaseous pollutants, as well as bio pathogens, coming from both inside and outside the building. From this point on we can be using the ducting to deliver health ier air throughout the occupied space and actively improve the lives of the occupants. We can take it one ste


We can take it one step further. It is allegedly reported that it is cleaner to eat on the toilet than at your work desk due to the germs in the workplace – although I will not be personally testing that! But by inserting newly available probiotics into the airstream that will land on the surfaces we can purify not just the air our clients breathe but also the keyboards, desktops, phones etc., that they use every single day.


ep further. It is allegedly reported that it is cleaner to eat


on the toilet than at your work desk due to the germs in the workplace – although I will not be personally testing that! But by inserting newly available probiotics into the airstream that will land on the surfaces we can purif clients breathe but also the keyboards single day.


y,, desktops, phones etc..,,y


fy not just the air our that they use every


We can go from a defensive role of trying to prevent a problem caused by unclean ducts, to actively providing a better place to work or live, improve health rates at work, residences and in care giving situations via those ducts to use our HVAC industry for the betterment of all.


We can go from a defensive role of trying to prevent a pro blem caused by unclean ducts, to actively providing a better place to work or live, improve health rates at work, residences and in care giving situations via those ducts to use our HVAC industry for the betterment of all.


Higher velocity airflows can prevent dust and dirt build up in the duct simply by virtue of the faster flowing air holding any sediment in suspension. Everyone understands that a fast flowing river will hold its sediment in the water while further downstream when the flow becomes much reduced, the sediment is deposited on the river bed. The air in the duct acts similarly. So there are a combination of actions that can be performed to reduce the dirt in the ducts in the first place, reduce the need for cleaning and help provide a better result for the client in terms of efficiency, costs and – most importantly – the health of the occupants by not allowing IAQ to deteriorate. We see that we can stop the duct becoming a ‘foe’. What if we could make it a ‘friend’ instead? What if we turn it into a delivery system for positive IAQ? We can use the items mentioned above and combine them with purification that actively removes the gaseous pollutants, as well as bio pathogens, coming from both inside and outside the building. From this point on we can be using the ducting to deliver healthier air throughout the occupied space and actively improve the lives of the occupants.


So there are a combination of actions that can be performed to reduce the dirt in the ducts in the first place, reduce the need for cleaning and result for the client in te rms of efficiency, costs and – most health of the occupants b We see that we can sto


importantly – the help provide a better


by not allowing IAQ to deteriorate. op the duct becoming a ‘foe’. What if we could make it a


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www.acr-news.com www.acr-news.com m


April 2018 39


RNL /Nicholas Leach LI/Nicholas LI


each


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