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Ready-to-Go Blower Door. The Minneapolis Blower Door comes equipped with everything needed to measure airtightness or diagnose air-leakage problems, says the manufacturer. In addition to a lightweight injection-molded fan, the standard Model 3 kit includes analysis software, communication cables, a “Cruise Control” feature that lets the operator maintain consistent building pressure without a computer, a nylon panel, and an aluminum frame that fits an 8-foot-tall door. It costs $2,500. The Energy Conservatory, 612/827-1117, energyconservatory.com