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.
Choosing between an HRV and an ERV. Heat Recovery Ventilation (HRV) is a system that uses the heat in stale exhaust air to preheat incoming fresh air. This reduces the energy required to bring outside air up to ambient room temperature.