Abstract: A rot-resistant window shutter and method of manufacture therefor, wherein the shutter is manufactured as a one-piece construction from a suitable cellular polyvinyl chloride substrate, and may be selectively structural and/or aesthetically manipulated without concern of degradation of structural integrity of the shutter, and thus without concern of jeopardizing the rot-resistivity thereof.

Abstract: A rot resistant window shutter and method of manufacture therefor, wherein the shutter is manufactured as a one-piece construction from a suitable cellular polyvinyl chloride substrate, and may be selectively structural and/or aesthetically manipulated without concern of degradation of structural integrity of the shutter, and thus without concern of jeopardizing the rot resistivity thereof.

Abstract: A method for monitoring the durability i.e. the service life of components of a thermal plant where, in functional relation to thermal as well as mechanical stresses, hours eqivalent to those of actual operation of such component at a given correlated mechanical and thermal stress value are counted. The correlated mechanical and thermal stress generated within the component and simulated by an equivalent electrical signal such as a voltage, is compared with a stress, likewise simulated by an electrical signal which at the relevant temperature of the component corresponds to a constant service life assigned by design specification, and the difference between the two electrical signals thus produced is correlated in a non-linear manner to a factor by which the period of actual operation is weighted and integrated, thus arriving at equivalent hours of operation.