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LEADER Straight Stream Air Flow

Conventional fans and blowers using the traditional Cone-Of-Air methods of Positive Pressure Ventilation (PPV) – depending on blade size and engine horsepower, loose their air pressure within 4 to 7 feet from the face of the fan.

Pressure (Pascal) equates to Volume (CFM)

conventional cone-of-airIt is pressure (Pascal) that pushes volume (Cubic Feet per Minute – CFM) through a structure to vent it.

Air coming off the conventional fan impeller wants to equalize with the atmospheric pressure on all sides as quickly as possible.

Lack of pressure to “drive” the air flow creates the cone-of –air.

The come of air results in much of the volume from the fan being lost before it enters the structure to be vented.

See the Air & Setback

By injecting artificial smoke into the air intake of any fan you can “see” the air coming off the impellers.

(See first image above) It is then apparent what the minimum and maximum distance should be for the fan’s maximum performance “set back” – the distance between the face of the fan and the entry to a given structure.

In photo 2 you see the typical placement of a conventional fan at 4 to 6 feet from the entry way.

A LEADER fan is very effective at this distance if you are forced to be this close to the entry.

However, in Photo 3 you see the LEADER Ventilator will operate with even greater performance at the 12 foot set back shown.

More flexibility in Set Back distance means less training required for set up, more room for firefighters and others to work and maneuver, and less noise in the structure due to the ventilator being farther away.

Too Close or Too Far Away – Training Issue !

Many times conventional PPV fans are not as effective as they could be due to lack of adequate training of the fire fighter.

If the fan is set too close to the entry it fails to create the necessary Cone-Of-Air to “seal” the entry.

If it is set too far back from the entry, much of the air off the face of the impellers strikes the exterior face of the structure.

Even with the best of training which results in the correct manufacturer’s specified set-back, still in many cases over two-thirds of the fan’s “air cone” never makes it through the common rectangular shape of the entry point of the structure to be pressurized and vented.


Maximum Air Flow/Maximum Set Back

leaderflowIn the photo you see the air pattern of the LEADER “Straight Stream” Air Flow ventilator.

The high-velocity, high-pressure air current of the LEADER fan shows the air stream still intact over 12 feet from the face of the fan.

Almost all the air from the LEADER Fan (16” impeller in this case) is directed into the entry port pressurizing and/or venting the structure with great efficiency.

Training is not such an issue with a LEADER ventilator because it is hard for a firefighter to set the fan “too close” or “too far away  !

Entrained Air Adds More Volume

leaderfan entrainedairLEADER’s Straight Stream Air Flow Technology not only allows almost all the air off the face of the fan to enter the structure, it also “entrains” additional air into the entry opening.

Entrained air is pulled along with and into the structure effectively sealing the opening or entry with in-rushing air rather than a cone of air !

LEADER Ventilators actually deliver more air through the entry and then out the exit port – providing an adequate exit port is created – than the air that comes off the face of the LEADER Ventilator !

Bigger is Not Always Better !

lightweightIt is a traditional thought that the bigger the fan blades, and the bigger the motor powering them, then the bigger the air flow will be.

Additionally, and for a fact, conventional fans are more costly the bigger they are.

However, LEADER’s Straight Stream Air Flow engineering means that now a much smaller ventilator with a much smaller motor will deliver more PPV Performance than much larger conventional fans.

A combination of the air off the ventilator (Pressure and Volume) and the entrained air (more volume) allows the LEADER Ventilator to outperform conventional fans with much larger fan blades and larger horsepower engines.

For example, the LEADER Model MT236H ventilator, our most popular unit, has 16.5 inch impellers and is powered by a 5.5hp Honda engine.

This unit when tested to AMCA-240-96R standards ( shown to produce over 17,000 CFM of air flow “out the back door”.

To get this much air from a conventional fan you would have to use 20” or larger fan blades powered by a 6 to 6.5 horse power or larger motor.

Larger, more expensive no longer equates to better air volume when LEADER is considered.

LEADER offers more air in a smaller package and at a better overall value than conventional fans.

So how does LEADER Technology make a smaller, less expensive ventilator outperform larger conventional fans ?