A composition for a slurry for manufacture of acoustical panels includes one or more fillers, one or more binders, water and zinc pyrithione. In accordance with one method, steps include receiving location data corresponding to a plurality of probe-feature locations on the substrate, storing the location data, accessing the location data, and scanning the substrate based on the accessed location data. Generally, the method includes causing the endpoint to transmit a standard meter reading message within a predefined frequency band. The deflector guides heat away from the housing in a direction.