Devices installed on the roof for the purpose of ventilating the interior of the building. Frequently combined with motorized fan equipment mounted on the roof, to provide positive air flow. French (Aérateur)

machines used in operating rooms (OR) and intensive care units (ICU) for respiratory support of patients who cannot breathe on their own. There are five main parameters: Tidal Volume (eg. 700 ml) [Volume of gas injected into trachea with each breath] Respiratory Rate (eg. 12 breaths/minute) FIO2 (Fraction of Inspired Oxygen) (eg. 0.6 or 60% oxygen) PEEP (Positive End Expiratory Pressure) (eg. 5 cm H2O) I:E ratio (eg. 1:3) Time for inspiration in relation to time for expiration