Metal ventilation devices to be disposed on window sashes, the ventilation devices comprising a ventilation passage and a mechanism for opening and closing the ventilation passage by manual control or automatic control by use of shape-memory alloy; metal ventilation devices for ventilating rooms, the ventilation devices comprising a ventilation passage and a mechanism for opening and closing the ventilation passage by manual control or automatic control by use of shape-memory alloy; metal ventilation devices for ventilating spaces under the floor, the ventilation devices comprising a ventilation passage and a mechanism for opening and closing the ventilation passage by manual control or automatic control by use of shape-memory alloy; metal ventilation devices comprising a plurality of blades and a mechanism for opening and closing the plurality of blades by manual control or automatic control by use of shape-memory alloy

Ventilation fans; ventilation fans with solar batteries; ventilation fans with window sashes; ventilation devices or ventilation equipments; ventilation systems; ventilation devices for ventilating rooms; ventilation devices for ventilating spaces under the floor; automatically opened or closed ventilation devices using shape memory alloys

Metal materials for building or construction; metal rails of window sashes having ventilation functions; metal ventilation members for ventilating rooms; metal ventilation members for ventilating spaces under the floor; metal window frames; metal window sashes; metal window sashes with ventilation fans; metal louvers for ventilation; metal covers for ventilation openings formed in walls; metal ventilation towers to be mounted on roofs

Metal materials for building or construction; metal rails of window sashes having ventilation functions; metal ventilation members for ventilating rooms; metal ventilation members for ventilating spaces under the floor

Ventilation fans; ventilation fans with solar batteries; ventilation fans with window sashes; ventilation devices or ventilation equipments; ventilation systems; ventilation devices for ventilating rooms; ventilation devices for ventilating spaces under the floor; automatically opened or closed ventilation devices using shape memory alloys