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F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
F24F7/00—Ventilation
F24F7/04—Ventilation with ducting systems, e.g. by double walls; with natural circulation
F24F7/06—Ventilation with ducting systems, e.g. by double walls; with natural circulation with forced air circulation, e.g. by fan positioning of a ventilator in or against a conduit
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FR1010578D1948-09-141948-09-14
Process for removing harmful gases, vapors and dust
ExpiredFR1010578A
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