OPT HVLS Fans For All Seasons(II)

In winter, the fans can be set to rotate more slowly, around 20 rpm, to gently push down accumulated hot air to the floor level while trying to minimize ventilation. "You don't want a draft, but you want to keep forcing the air back down, with a constant pressure." The company claims that the HVLS fans can help reduce demands for heated air by as much as 30 percent.