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 there is a model that offers a NRR of 33, does that mean your supply of NRR 29 earplugs is unsafe7 The correct answer is no, unless the exposure time and noise levels require that level of protection, finder most workplace noise conditions, a NRR of 29 offers excellent protection.