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A rooftop exhaust fan that moves air only when electricity is available can become an operating-cost problem for facilities that need heat relief every day. The Edmonds ecoPOWER Hybrid Ventilation Best ROI question comes down to a more practical issue: can a hybrid rooftop system remove enough heat and stale air, with less purchased energy and less maintenance exposure, to justify its installed cost? For the right building, the answer can be yes. Edmonds ecoPOWER Hybrid Rooftop Exhaust Fans …