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.
SNR Definition. The signal to noise ratio is commonly written as S/N or SNR. It measures the strength or power of the desired signal relative to the unwanted background signals or noise.What constitutes a signal depends on the application or data you use.NR Definition. The signal to noise ratio is commonly written as S/N or SNR. It measures the strength or power of the desired signal relative to the unwanted background signals or noise.