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 effectiveness of a hearing protection earplug or earmuff is specified by a Noise Reduction Rating (NRR). The typical range for hearing protection is from 15 to 35 decibels of sound attenuation. The higher the NRR is, the more noise attenuation it provides, as long as it is also a good fit in the ear.