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.
In the meantime, this information will help the newcomer understand the basic concept. SWR is the common abbreviation for Standing Wave Ratio. It may, in some circles, be referred to as VSWR (voltage standing wave ratio). Never the less it is the same. For the most part the term has been reduced to SWR since the calculation can involve either voltage or current.