Patent classifications
F
MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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F24
HEATING; RANGES; VENTILATING
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F24F
AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
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11/00
Control or safety arrangements
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F24F2011/0002
for admittance of outside air
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F24F2011/0005
to create underpressure in a room, keeping contamination inside
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