I have a gas back boiler in the chimney in the lounge. There is a "large" ventilator, approx. 15cm diam., in the front wall of the lounge which I assume provides ventilation for the back boiler. The problem with this ventilator is that it points in the direction of the the prevailing wind and, at this time of year, provides a chilly blast into the lounge.
What I would like to do is place a barrier, outside, about 15cm in front of the ventilator to stop the direct blast of air coming in.
Would this be OK?
TIA.
KJR.