How much energy will this fan waste? conserve? It's time to change the conversation. A lot of people like to talk about full load efficiency. But here's the thing. Many air movement applications only need to operate at full load a small percentage of the time. That's why we calculate the efficiency of our ECM fans at all duty points by using Specific Fan Power, or SFP. This value represents a fan's true efficiency during partload periods. In other words, SFP tells the whole story. Like the other 364 days. Discover the new standard in efficiency at systemair.net. The global leader in ventilation for 40 years.http://www.systemair.net