comment mvhr is the ideal choice
ance increases background ventilation rates by up to 50 per cent. This looks set to cause a move away from intermittent fans since the previous provisions in Approved Document F 2006 have already been difficult to achieve when using trickle ventilators in windows. The changes to Part F and Part L favour
Cover image supplied by Mark Williams. See page 6.
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Ian Mitchell, residential product manager at Vent-Axia, outlines the benefits that mechanical ventilation and heat recovery (MVHR) ventilation systems bring to self build projects.
The consolidated Building Regulations intro- duced last year represent a key stage on the path to the UK’s target of making all new homes zero carbon from 2016 and encour- age the uptake of MVHR. Part
L’s
(Conservation of Fuel and Power) new Target Emission Rate (TER) demands a 25 per cent carbon emissions improvement over the pre- vious 2006 Building Regulations and is in line with achieving Code for Sustainable Homes Level 3, the requirement now for all private developments. Ventilation can play an important part in
reaching these targets. For a home to meet Code Level 3 it is necessary to reduce the air permeability of the building to the minimum consistent with health requirements. As a result changes to Part F publish guidelines for airtight properties with infiltration rates tighter than 5m3
h/m2
continuous ventilation since it performs better in SAP, is easier to specify and easier to stan- dardise as trickle vents are not required. For Continuous Mechanical Extract, System 3 approaches, the guidance removes the requirement for background ventilation in dwellings designed with infiltration rates above 5m3
h/m2
. It is likely that these factors,
along with the Dwelling Emission Rate (DER) benefits of SAP Appendix Q, will combine to boost the adoption of whole house mechan- ical extract ventilation systems (MEV and dMEV) and mechanical ventilation systems with heat recovery (MVHR). Supplied as single room, through the wall
or as whole house, multi-room ducted solu- tions, MVHR combines supply and extract ventilation in one unit. Whole house systems can prove very effective at reducing the heat load in energy efficient homes since they recover heat which would have otherwise been vented outside and therefore lost. Single room systems are proving an increasingly popular choice for small scale renovation projects such as kitchen extensions. Both types of system tend to offer dual speed options, either continuous trickle ventilation or high speed boost extract flow, and the more airtight the property the more energy efficient the heat
recovery system will prove. Not only is heat recovery ventilation good at 50pa. For Intermittent
System 1 and Passive Stack System 2 approaches in airtight dwellings the guid-
at saving energy for your home, it brings other benefits as well including reduced con- densation and much better indoor air quality.
outstanding u-value results
Recent industry testing has returned some great results for Kloeber UK Ltd. Kloeber were delighted to see that their
range of folding sliding doors, front doors, French and single doors and windows have achieved overall U-values well below Building Regulations requirements even with their standard double glazing. With triple glazing options containing Argon and Krypton gas filled cavities the results are exceptional and has firmly established Kloeber as a supplier of top performing thermally efficient products. UK Building Regulations state that all
new build projects should be fitted with doors and windows with overall product U-values of 2.0 or less. The whole of
Kloeber’s timber range has surpassed this benchmark by a considerable margin with Kloeber’s Funkyfront and Klassicfront doors achieving overall products values as low as 1.2, their folding sliding doors, French and single doors returning results as low as 1.1, and their flush casement windows attaining overall U-values as low as 0.9. Kloeber’s technical director Lee Green
said, “We’re thrilled with the results, espe- cially as we’ve designed our products to return fantastic U-values whilst maintaining a very fair and sensible pricing structure; something that Kloeber has always consid- ered important.”
Enq. 100
4
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