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"In order to pull in enough outside air to cool the house at night, the NightBreeze requires a large exterior intake grille — usually about 3’x3’ (assuming the grille has 50% free area). If the air handler is located in the attic, the air intake grille can be mounted in a gable, in a doghouse dormer, or at the top of a false chimney. The air-intake duct is connected to a damper box containing a large hinged motorized damper blade. Damper leakage is minimal — at 25 Pascals, it’s about % of total fan flow. According to David Springer, the president of Davis Energy Group, one of the main consulting groups that developed the NightBreeze, ‘It is possible to achieve 6 percent duct leakage in a system that includes the damper.’ The wall-mounted NightBreeze control replaces a conventional thermostat. ‘At my house, the control is set for a 5-degree delta T,’ says Springer. ‘The upstairs thermostat is set to 80°, so it’ll start ventilating when the outdoor temperature drops to 75°. By morning, the outdoor temperature might be in the fifties or low sixties, and the indoor temperature might be 68°.’