FREE SHIPPING TO CUSTOMERS IN MANITOBA INCLUDED IN SALE PRICE! Is the fan on your bin TOO SMALL to do the job? S3 3 HP Booster fans are designed to fit on the suction side of a 18" round aeration fan. All S3 aeration fans are equipped with an aluminum wheel assembly for efficient power usage. The fan housing is painted steel for long life and fan controls are "Bin Sense Ready"