Detailed answer regarding Ceiling Fan Direction. During the summer, you want the air blowing directly on you so you will feel cooler from the wind chill effect (which is how fans cool you off). So stand under the fan and turn it up on high speed.
NRR STANDS FOR NOISE REDUCTION RATING. NRR (noise reduction rating) is a single number rating method which describes a hearing protection device (HPD) based on how much the overall noise level is reduced by the HPD. Most noise measurements in the industry are derived from the A-weighting scale.
Explanation of NRC. Oftentimes confused with the STC rating, NRC stands for Noise Reduction Coefficient. Basically,this measurement shows how much sound a material can absorb. This measurement is used togauge materials that are created to absorb sound, rather than block it.