One of the most common myths about nodules is the diagnosis itself! Usually doctorâs donât have the necessary equipment (stroboscopy) to diagnose vocal problems. So all problems are called nodules. Every singer has a colleague who had ânodulesâ for this reason.
Glossary of HVAC terms. HVAC (heating, ventilation, and air conditioning) is a major subdiscipline of mechanical engineering. The goal of HVAC design is to balance indoor environmental comfort with other factors such as installation cost, ease of maintenance, and energy efficiency.
An air-to-air heat exchanger, or what is more commonly called today a Heat Recovery Ventilator (HRV), is a air change central ventilation system that exhausts stale air outdoors and brings in an equal quantity of fresh air to replace it while stealing the heat from the outgoing air to warm up the incoming air.