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Keravent manufacturers roof and wall mounted natural smoke and heat exhaust ventilators. Product family includes transparent and non-transparent models. Actuators are motors (24VDC or 48VDC and 230VAC) or gas springs. Motor operated ventilators are user-friendly, as ventilators may be operated for open and closed position from the button at floor level. Gas spring operated ventilators needs to be closed manually from the roof side.