Bathroom Extractor Not Clearing Steam
Persistent condensation, black mould at ceiling corners and mirrors that stay fogged..
Persistent condensation, black mould at ceiling corners and mirrors that stay fogged.
What is actually going on
Persistent condensation, black mould at ceiling corners and mirrors that stay fogged.
The realistic causes, in order
A fan with too little extract rate for the room, or one clogged with dust A long or crushed flexible duct that destroys the fan's actual performance No make-up air path, so the fan cannot move air even when it is running
What we test on site
Measured extract rate rather than the box rating Duct route, length, bends and termination Door undercut and any trickle ventilation
Questions we get asked
What causes an extractor that won't clear steam in a bathroom?
A fan with too little extract rate for the room, or one clogged with dust
What normally puts an extractor that won't clear steam right?
Correct fan selection and a short, rigid duct run makes far more difference than a more powerful fan on bad ductwork.
Is it safe to keep using the system with an extractor that won't clear steam?
Persistent bathroom condensation is a building-fabric problem as well as a comfort one. Fixing extraction protects decoration and plaster.