Sexually transmitted diseases -- or STDs -- often are silent, meaning there are no symptoms. Women may not notice any symptoms until they have developed serious complications. Be on the lookout for: A drip or discharge from the penis, urethra, vagina, or anus; the color may be white, yellow, green, or gray.
An energy recovery ventilator (also abbreviated ERV) is a type of air-to-air heat exchanger that not only transfers sensible heat but also latent heat.Because both temperature and moisture are transferred, ERVs can be considered total enthalpic devices.he benefit of using energy recovery is the ability to meet the ASHRAE ventilation & energy standards, while improving indoor air quality and reducing total HVAC equipment capacity.
Tidal volume (TV) measures the amount of air that is inspired and expired during a normal breath. On average, this volume is around one-half liter, which is a little less than the capacity of a 20-ounce drink bottle. The expiratory reserve volume (ERV) is the additional amount of air that can be exhaled after a normal exhalation. It is the reserve amount that can be exhaled beyond what is normal. Conversely, the inspiratory reserve volume (IRV) is the additional amount of air that can be inhaled after a normal inhalation.