Surevent have the knowledge and understanding to carry out thorough inspections to ensure installations are completed as per Part F Building Regs and the Domestic Ventilation Compliance guide.
The home owner complained that the system was noisy and that there was a leak beneath the ventilation system.
You will see that the installation has used too much flexible ducting. NHBC states that flexible ducting is kept to a minimum 300mm per end of run, i.e. room valve and system end.
You will notice that flexible ducting has been used in excess of 300mm and has been used to form directional changes.
Flexible ducting is approximately 1/10th the efficiency of solid ducting so to achieve the expected air values the systems internal fan motors have been adjusted up.
We found the systems fan speeds set to maximum and not delivering the accepted air flows. The noise complaint, would have originated from these issues.
We also picked up on the condense trap. The condense pipe fittings were not sealed properly causing the leak.
The condense trap, fitted beneath the ventilation system, has been made out of plumbing pipe fittings.
A recognised `off the shelf’ non-return gland is the preferred fitting.
A non-return gland protects the system from back pressure/water which can cause damage to the internal fan motors and electrics.
Following our inspection visit and report, you can see the improvements made.
By replacing flexible ducting for solid allowed the engineer to reduce the fan speed/noise.
By fitting a non-return gland beneath the system, the internal parts were now protected.
Our client was very happy, as the system was now delivering the expected air flows at an acceptable noise level.