I left the extractor grille in my bathroom untouched for two years just because it sat too high to reach: the day the black line appeared along the ceiling, I understood what the fan had stopped pulling out
A creeping black line across your bathroom ceiling isn’t just dirt—it’s evidence that your exhaust fan has stopped working properly, even while still humming away. Discover what causes this hidden failure, why bathrooms are vulnerable to mold growth, and the simple fixes that can restore your fan’s suction.