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.
FNR-Frame Noise Reduction: used to eliminate fine noises from blu-ray discs. BNR-Block Noise Reduction: used to eliminate mosiac like noises.MNR-Mosquito Noise Reduction: no idea as the abbreviation is itself so confusing. gold ring will have the gold content inscribed inside. It may  also have the manufacturer's mark inside. 5C would be the  manufacturer's mark.