The four large rotating wind cowls situated on the roof of the WWF building naturally rotate away from the prevailing wind to allow stale air from within the building to be naturally exhausted. To ensure it all works as designed the cowls are subject to regular maintenance twice a year, but after 15 years of constant wind buffering the internal bearings are tired and worn out and now need to be replaced.
When new the wind cowls naturally rotate a wind speed as low as 2m/s driven by the large aero wing on the rear of the wind cowl. However, over time bearings have disintegrated increasing friction that is now starting to compromise the effective rotation of the cowls under low wind conditions. Over the next few months the entire bearing arrangement will be updated and renewed to revitalise the cowls back to new condition.
