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.
With a non-rebreather mask, you should be using O2 flows >10LPM, and more like 15 LPM. The NRB requires higher flow rates because when the patient inhales, the reservoir bag deflates, and at lower flow rates, the bag will completely deflate and cut off supplemental O2 flow. Those masks aren't completely sealed, so the patient will continue to breathe room air once the reservoir bag is empty.