A building material guarding against a sick house and using coffee grounds after drinking as a recycled resource, and an installation method thereof. The clock sources have specific clock source specifications, and the circuit modules have specific clocking requirements. An input side opening having a slit shape is formed as a cutout in the top edge of the front-to-rear rib. The size of the cells can be varied between various locations of the surface of the component, for making it possible to cut out the component without altering its optical properties.