core noun [C, usually singular]. âº the most important or most basic âpart of something: the core of sth The core of the bank's âbusiness is in Hong Kong.be at the core of sth The âinternet is increasingly at the core of the âtelecoms âbusiness. uk us /kÉËr/.
Ventilator Types. Ventilators for home use are small, lightweight and run on electricity. They can be powered by the internal battery for brief trips outside the home, and can sit on a bedside stand, cart or wheelchair and be used for travel. Most feature various levels of gas/air-flow pressure, volume, rate and duration to control breathing or to wean a patient off the ventilator.
Both types include a heat exchanger, one or more fans to push air through the machine, and controls. There are some small wall- or window-mounted models, but the majority are central, whole-house ventilation systems with their own duct system or shared ductwork. The main difference between a heat-recovery and an energy-recovery ventilator is the way the heat exchanger works.