Positive Pressure Fan

Positive pressure ventilation uses positive airflow to remove heat and products of combustion from a structure on a fire scene.

Positive pressure fan.

Ppv fans come in many different sizes from 16 blades that fit in the tightest of apparatus compartments to large scale ppvs for the largest of jobs. Positive pressure ventilation in your home what exactly is positive pressure ventilation and how does it fit into your home. The results of the experiments were compared with fire dynamic simulator fds output. First let s look at how a positive pressure mechanical ventilation system works.

Excess air escapes passively through designed outlets. Positive pressure is a pressure within a system that is greater than the environment that surrounds that system. Positive pressure rooms maintain a higher pressure inside the treated area than that of the surrounding environment. Because air heads from a high air pressure area toward a low pressure area the concept pulls pushes the fire and debris toward the exhaust point with it.

Positive pressure ventilation fans blowers are used to push fire and debris in the air toward an exhaust point. This means air can leave the room without circulating back in. In this way any airborne particle that originates in the room will be filtered out. Available positive pressure ventilation ppv blower styles and models.

They re also often referred to as positive input ventilators piv and are often sought out and installed by people who find they have condensation issues in their home. We also carry electric smoke ejectors blower exhausters confined space heater systems and more. Designed for high powered air movement the super vac positive pressure ventilators are for use in extreme conditions. Experiments were performed in an open atmosphere and in a simple room geometry.

Full scale experiments were conducted to characterize a positive pressure ventilation ppv fan in terms of velocity.