Ventilation
performance axial fans have been designed to ensure compliance with Building Regulations, with the DKF150 for example providing extract volume rates up to 48.8 l/s (which easily meets the new minimum rate for a 5 bed property which changed from 29 l/s to 43 l/s). Even existing properties, that don’t fall under the auspices Building Regulations, can benefit from more powerful fans in removing damp, stale air. As well as encouraging customers to buy more powerful fans, control options provide a further opportunity to add value.
Whilst the lowest cost option – the basic timer and pull cord model – is one of the most popular options, you might be surprised to hear that our research has shown the other most popular control option to be humidistat, or combined humidistat and timer, that react to a significant change in humidity. These versions are at the top end of the market financially, but hugely popular, so be sure to offer this to customers as an alternative. PIR-based controls that activate the fan on the detection of movement are also available, but are less popular.
Ducting
A ventilation system, even if it’s just a simple extract fan in a bathroom, is only as good as its ducting. If a customer is looking to buy flexible ducting, steer them away and towards rigid ducting. Yes, it is an upsell for you, but it really will make a positive difference to their ventilation
“With our increased understanding of the importance of Indoor Air Quality, ventilation has become an industry in itself.”
system as flexible ductwork causes a lot more air resistance and can be easily damaged or crushed, impeding the work of the fan and making it noisy. The larger, more complex the ventilation system, the more important the ducting becomes. Promoting the use-quality ducting that has exacting tolerances and connects together for minimal air and moisture loss and maximum system efficiency makes a big difference to the ventilation system and can have a positive difference to your income. Domus Ventilation rigid ducting has been designed to work in harmony as part of a system and has been third party tested for end-to-end system performance.
Ducting accessories
Good quality ducting also comes with accessories and useful products designed to assist installers with site related constraints, such
as the Domus Greenline Bend which has been engineered to reduce duct bend resistance by up to 60%. These all represent great opportunities to add value to an order, whilst also benefiting your customer. Top extras include ducting insulation (recommend specific duct insulation rather than standard building insulation materials) and firestopping products, both of which are required by Building Regulations. Also required by Building Regulations are non-combustible air bricks, such as our award winning Solis Air Brick, where ductwork penetrates through the external cavity when above 18m in England and 11m in Scotland. Lastly, a popular add on is sound attenuators to absorb noise travelling through ductwork.
Pollution filters
When it comes to whole house Mechanical Ventilation Heat Recovery (MVHR) systems, pre- filters are available that fit into the ducting supply leg to filter potentially dangerous pollutants from entering the home. If you are in an urban area, or your customer is working on a property in an urban area, or by a busy road, recommend they consider adding these to the scheme. Domus Ventilation’s NOX-FILT, for example, prevents up to 99.5% of NO² pollution.
ewnews.co.uk
April 2025 electrical wholesaler | 29
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