MVHR Radial Ducting
A breakthrough in domestic ventilation ducting
Four kinds of ducting are compatible with a whole house Mechanical Ventilation & Heat Recovery (MVHR) system; flexible ducting, rigid metal ducting, rigid PVC ducting, and semi-rigid (bendy) ducting. Ducting can be installed in either a 'branch' configuration, where one pipe or branch services multiple rooms, or it can be a radial system where every room has it's own dedicated air pipe, all fed from one air distribution box or manifold.
Flexible ducting in a branch configuration is frowned upon by BPEC, the body that certifies our installers, as condensation can pool in the internal spirals and can potentially become a health risk. Its fine if it's insulated and used in short lengths to connect the unit to atmosphere, but is best avoided in the rest of the property.
Rigid metal ‘spiral’ ducting in a branch configuration is difficult to work with and is susceptible to heat loss, so even if the MVHR is 90% efficient, up to 50% of the warm air inside the pipe could be lost on the way to and from the heat exchanger. Large diameter spiral ducting is typically reserved for commercial air handling systems which don't generally recover heat.
Rigid PVC ducting is certainly the most common domestic system, however it’s difficult if not impossible to clean and requires substantial boxing-in making it tricky to retrofit. A ‘branch’ ducting system with flexi, metal or PVC pipe is also prone to acoustic issues, either a whistling from the supply/extract valves nearest to the fan motors or 'cross talk' travelling from one room to another. The last thing you need is TV noise in your bedroom from somewhere else in the house.
By far the best kind of ducting in a domesitic or small commercial property is the new semi-rigid ‘radial’ ducting. The benefits radial ducting include:
If Solarcrest design and supply your MVHR we provide everything required to install the complete system, including coils of 75mm radial ducting, 150/180mm insulated flexi ducting, exterior wall or roof terminals with flashings, adjustable supply & extract in-room air valves, appropriate switches and/or remote controllers and a dry none-return valve for the condensate drain. The only additional items required are 0.5mm twin core cable/flex if a manual boost switch is required, 22mm push fit overflow pipe, and either tie band, clips or zip ties to secure the ducting in place. These are provided if we also install your system.
For accurate supply and/or install budget costs and a list suitable MVHR units please complete our enquiry form.
See a simple system diagram