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Propeller composition and blades Wood versus metal propellers Wheels - Pneumatic versus solid Fan placement Fan horsepower versus size Confined space ventilation Shrouds Troubleshooting Thrust Warning

Do you recommend Negative Pressure Ventilation?

VENTRY Fans are designed primarily for positive pressure ventilation and PPV is simply more effective than negative for attack and ventilation. The difference in efficacy between negative and positive pressure ventilation can be easily seen by observing any fan. Stand in front of a fan and you will notice lots of air flow; stand on the other side and there is very little airflow. The same observation is apparent at a fire by observing how fast positive pressure pushes smoke and heat out of a structure versus how long it takes using negative pressure.

Though we do not advocate negative pressure for attack, it is very helpful for cleanup and overhaul. Turning the fan around and aiming it outdoors will pull out any remaining carbon monoxide from a structure and pull in 100% fresh air. (Wait until the smoke is gone so that it will not be pulled through the engine and cause damage.)

On attack: Unlike negative pressure and vertical ventilation, PPV can be accomplished without entering the structure, requires fewer people, and takes much less time to implement. PPV does not damage your fan by sucking hot gases through the engine, as can be the case with negative pressure ventilation. Vertical ventilation requires a team on the roof of a burning building; that takes lots of time and manpower plus the roof of a burning building is an extremely dangerous location. Although negative pressure ventilation can be accomplished from outside a building, in practice it is usually set up from inside, which again puts the ventilation crew at risk.