Abstract: A wafer container includes a frame, a door and at least a pair of shelves. The frame has opposite sidewalls. The pair of the shelves are respectively disposed and aligned on the opposite sidewalls of the frame. Various methods and devices are provided for holding at least one wafer to the shelves during transport.

Abstract: A fan device for a smoke exhauster includes a housing having an upper plate and a lower plate, and the upper plate is secured to a motor and rotated by the motor, the lower plate includes a bore to allow an air to flow into the housing of the fan device, and a number of fan blades secured between the upper plate and the lower plate and each fan blade include a curved bottom edge to allow the air to flow into the chamber of the fan device before contacting with the fan blades, and the fan blades each include a number of orifices for reducing a noise generated by the fan blades when the fan blades are rotated relative to the motor. The fan blades are preferably disposed inclined relative to the upper plate and the lower plate.

Abstract: A smoke exhauster includes a housing having one or more orifices each for receiving an oil cup, and a catching device for catching the oil cup to the housing when the oil cup is moved upwardly relative to the housing, and to release the oil cup from the housing when the oil cup is moved upwardly relative to the housing again. The catching device includes a follower slidably received in a container, and a grasping device for grasping the follower to the container when the follower is moved upwardly relative to the container, and to release the follower from the container when the follower is moved upwardly relative to the container again. The housing has one or more windows for viewing the oil cups.

Abstract: A smoke exhauster includes a housing having one or more openings formed in a bottom plate and having three or more protrusion extended from the bottom plate and arranged around the opening of the housing, and one or more fan devices engaged in the housing. A net device includes an outer peripheral frame, an inner peripheral frame, and a number of ribs extended between the outer peripheral frame and the inner peripheral frame, the outer peripheral frame is detachably engaged with the protrusions for allowing the net device to be attached to the housing without fasteners. The protrusions each may include one or more notches for receiving the outer peripheral frame of the net device.

Abstract: A smoke exhauster includes one or more rails for attaching to a supporting surface, and a housing having one or more slots for slidably receiving the rails and for easily and readily and detachably attaching the housing to the rail or the supporting surface. The rail includes an anchoring member, such as a projection extended from the rail, and the housing includes another anchoring member, such as a depression formed in the housing for engaging with the projection and for detachably anchoring the housing to the rail. The rail includes one or more securing panels for securing to the supporting surface with fasteners, and a base panel having a number of apertures for engaging the fasteners.

Abstract: A ventilator fan structure includes a disk-shaped seat, an annular plate, and a plurality of blades. Each of the blades is arranged in an oblique manner along a rotational direction of the fan structure and has a primary blade portion and a secondary blade portion with different widths, thereby enhancing the suction force of each of the blades for the oil and smoke. Thus, the fan structure enhances the air drainage rate of the ventilator and reduces noise during operation of the ventilator.

Abstract: A ventilator having an abnormal operation indication device includes a power supply circuit, a central processing unit, a fan motor, and a load sensing circuit. Thus, the load sensing circuit detects the abnormal operation signals through the sensor, so that the abnormal operation indication lamp on the panel of the ventilator lights, so as to indicate that the part of the ventilator is disposed at an abnormal operation state and needs to be inspected and amended, thereby facilitating inspection and maintenance of the parts of the ventilator.

Abstract: A ventilator includes a power supply circuit, a wireless transceiver module, a central processing unit, a telephone set, and a doorbell set. Thus, the ventilator can notify the user of presence of the incoming call during operation, so that the user can work in the kitchen without missing the incoming call from the telephone set. In addition, the ventilator can notify the user that the doorbell of the doorbell set rings during operation, so that the user can work in the kitchen without missing the doorbell rings from the doorbell set.

Abstract: A ventilator having a muting device includes a central processing unit, and a fan motor. The fan motor is connected to a start capacitor which is electrically connected to a temperature sensing circuit which is electrically connected to the central processing unit, so that the start capacitor can indicate a signal on a panel of the ventilator, so as to control a rotational speed of the fan motor. Thus, the operation state of each part of the ventilator is indicated on the panel of the ventilator clearly to facilitate inspection of the user, so that the user can control the rotational speed of the fan motor to a proper value, thereby reducing the noise during operation, so as to achieve a muting effect.

Abstract: A ventilator having an optimum air box includes an outer hood, an air box, and a fan motor. The air box is mounted in the outer hood and is provided with a receiving zone which is extended forward, so that the smoke suction port of the outer hood and the fan motor are displaced forward and are located above the range exactly, so that the oily smoke produced from the range is sucked into the smoke suction port of the outer hood entirely and completely, thereby greatly enhancing the ventilating effect.

Abstract: A ventilator having a muting device includes a central processing unit, and a fan motor. The fan motor is connected to a start capacitor which is electrically connected to a temperature sensing circuit which is electrically connected to the central processing unit, so that the start capacitor can indicate a signal on a panel of the ventilator, so as to control a rotational speed of the fan motor. Thus, the operation state of each part of the ventilator is indicated on the panel of the ventilator clearly to facilitate inspection of the user, so that the user can control the rotational speed of the fan motor to a proper value, thereby reducing the noise during operation, so as to achieve a muting effect.

Abstract: A ventilator having an abnormal operation indication device includes a power supply circuit, a central processing unit, a fan motor, and a load sensing circuit. Thus, the load sensing circuit detects the abnormal operation signals through the sensor, so that the abnormal operation indication lamp on the panel of the ventilator lights, so as to indicate that the part of the ventilator is disposed at an abnormal operation state and needs to be inspected and amended, thereby facilitating inspection and maintenance of the parts of the ventilator.

Abstract: A ventilator fan structure includes a disk-shaped seat, an annular plate, and a plurality of blades. Each of the blades is arranged in an oblique manner along a rotational direction of the fan structure and has a primary blade portion and a secondary blade portion with different widths, thereby enhancing the suction force of each of the blades for the oil and smoke. Thus, the fan structure enhances the air drainage rate of the ventilator and reduces noise during operation of the ventilator.