Positive Pressure Ventilators
- The cone of air must cover the intake opening. The fan must be placed the correct distance such that the cone of air form a seal around the opening.
- The size and location of the discharge is important. The discharge, if at all possible, should be as high and as far away from the intake as is practical. The discharge size should be between .75 to 1.5 times the intake. This may not always be possible as the fire may have already dictated discharge locations and sizes, but whenever there is a choice, conform to the above criteria.
- It is important to control the airflow between the intake and discharge. Positive pressure ventilation can move air long distances if proper control is maintained by opening and closing doors, windows, etc. It is important that firefighters understand not to open the structure too much, ie., breaking windows, etc.
|
