Ventilation ●From previous page

The first step in designing a ventilation system is for the contractor to obtain project drawings from the architect or developer and supply these to their wholesaler.

It is important to specify the correct unit

for a property, as different MVHR units will offer different configurations. We design systems that ensure the MVHR unit is never working at more than 75% of its maximum capacity, ensuring that the unit works quietly and efficiently.

Location, location, location The next step in ventilation design is to decide where best to locate the MVHR unit, risers and ducting. The loft is an ideal location for the MVHR but in properties with vaulted ceilings an alternative location is needed such as a utility room or a plant room. It’s also important to consider the building design and whether the ceilings have voids to run the ducting or webbed eco joists where the ducting can be run. When it comes to MVHR systems, contractors can be put off by the arduous and specialist nature of traditional plastic ductwork but there is now a cost effective, simple alternative. Switched on electrical wholesalers can advise their customers that semi rigid ductwork, such as National Ventilation’s Monsoon Radial ducting, is ideal for smaller developments since it is flexible but robust with an outside diameter of just 75mm and, critical for ease on-site, it is up to 60% quicker to install.

38 | electrical wholesalerApril 2018 This type of ducting also means fewer

mistakes, since even a novice can install it to a high standard, with a Stanley knife the only real tool needed to install it, resulting in an airtight installation and improving system performance. With a range of plenums and accessories available, this system can overcome over 99% of issues that may occur on site, welcome news for contractors.

Site visit

Once the location of the MVHR unit, risers and ducting has been decided the next stage is for the electrical wholesaler to receive the design and quote. This is supplied with detailed calculations, proposed ducting layout, where to put the MVHR unit and risers and how to control the unit, making everything simple and straightforward for the contractor. However, quite often, plans only tell half the

story and contractors can often be caught out if things such as steels don’t show up on the original plans. The knock-on effect of this can be

a need for additional materials that haven’t been considered in the original calculations. This could result in an unhappy customer, which is far from ideal. We can overcome this with a free pre-order

site visit to ensure the design will perform as intended. A service like this is a great trouble shooting exercise and is also a good opportunity for the electrical contractor to learn more about the installation process, thus encouraging future potential orders for the electrical wholesaler. By using a free planning and advice service,

electrical wholesalers can be confident that they will be able to speak knowledgeably to customers and help them gain new contracts through providing this information. Therefore both wholesalers and contractors can be safe in the knowledge that the system is well designed and fit for purpose and that there is a point of contact that will assist them throughout the whole job. When it comes to MVHR systems,

contractors can be put off by the arduous and specialist nature of traditional plastic ductwork but there is now a cost effective, simple alternative.

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