A filter device has a filter housing, which is intended to contain a liquid to be filtered and in which at least one filter rod is arranged. The method of making the structural connection includes the steps of providing the structural member, inserting a segment of the structural member into the hollow of a building structure, and securing the structural member to the building structure with two or more strips. Then in response to initiating a write operation on that data block, messages are sent to all the computers holding that block which resets the said flag, thus informing each computer that the data in that block is no longer valid. Moreover, the first and second cords are held inside the lower rail, hence accident caused by the exposed cords can be prevented. A transition occurs from the first state to the second state when the fan operates at the slowest possible speed for a predetermined period while the condenser temperature is below a desired value. In one particular embodiment, a spacer layer stack is provided having a first etch stop layer, a first spacer layer, a second etch stop layer, and a second spacer layer, wherein the first and second spacer layers are comprised of silicon nitride.