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.
The signal to noise ratio, S/N or SNR, tells you how much of the signal you get is corrupted by background noise. A high SNR shows that you are getting a good signal.Signal to noise calculations are widely used in science, electrical engineering and in evaluating communication devices.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.