This shows how well sub floor ventilation works. Using a simple smoke test visually shows it working really well. Sub floor ventilation basically reduces moisture build up within the suspended timber floor void, with an aim to prevent dew point occuring. When Dew point occurs condensation occurs and can cause dry rot, wet rot and even damp issues. It’s imperative your vents are not restricted and ideally sleeved through the wall. This ones have just been upgraded to sleeved ones, which also prev