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.
This means that if you are firing a rifle that produces 140 dB and the hearing protection that you have on has an NRR 33 dB, the level of noise exposure is not reduced to 103 dB. To determine how much noise exposure is reduce, deduct 7 from the NRR on the device and divide the result by two.