Information Request Form for Snorkeling or Scuba Diving Activities. This form should be completed by the IU project / activity leader no less than 30 days prior to planned. scuba diving or snorkeling activities. The IU Diving Control Boardâs designee, the Diving Safety Officer. (DSO), will receive and review all scuba diving and snorkeling requests.
Pressure-cycled ventilation. This form of mechanical ventilation includes pressure control ventilation (PCV), pressure support ventilation (PSV), and several noninvasive modalities applied via a tight-fitting face mask. In all of these modalities, the ventilator delivers a set inspiratory pressure.
They also use room air for combustion, but the amount of air they use is minimal. Direct Vent. In direct-vent appliances, you use special direct-vent pipe recommended by the supplier. The direct-vent system involves two parts, one part for the exhaust and one for combustion air intake. The appliance itself is a completely sealed combustion chamber and no air from the house is used for combustion.