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10-SPEED FAN Reversible and Manual lift ... QUIET: RVLOVENT 12 volt RV roof vent can intake or exhaust fresh air immediately and stay cool without distracting noise. EASY-TO-INSTALL: Fits all ...
They're reversible, meaning they can be configured ... configuration if you have more intake fans sucking air in than exhaust fans blowing air out, creating more air pressure inside your case.