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.
Because noise is measured on a logarithmic scale, a reduction in noise of 3 dB, which seems small, is in fact the equivalent of halving the intensity of the noise. This would mean that the person could work for twice as long at the reduced level and have the same daily personal noise exposure as before.