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No-Frills Fresh Air A contractor puts the finishing touches on a prototype French-made ventilation system. The advanced exhaust-only system, from Aereco, should be available soon in Canada and the U.S. by Charles Eberdt Simple upgrades to your current approach can ventilate the whole house Since the early 1980s, the utilities in the Northwest have sponsored two major programs promoting energy-efticient construction techniques in new homes. Although these programs initially required air-to-air heat exchangers, a little over a year ago the rules were relaxed to include less expensive non-heatrecovery systems. These simpler systems will not satisfy everyone in every house. But they do most of what a ventilation system should. The systems consider supply air as well as exhaust. Good distribution is stressed, and controls are meant