If you have one fan...

A good rule of thumb with VENTRY Fans is to set the fan back 1.5 times the height of the opening you are ventilating through (illustration). For balloonists and firefighters, this is farther than you are probably accustomed. For firefighters on residential fires, it is generally 8 to 12 feet from the entry point, allowing access to the door without delay and without tripping over the fan.

Also see: 2 Secrets to High Performance

With VENTRY Fans, it is better to be too far away than too close because volume drops off much slower if you are too far than it does if you are too close. When a PPV Fan blows air in and smoke pours back out the top of the door, the fan is too close to the entry point! It is the tight air cone of VENTRY Fans that allows them to be placed far back from the target.

Please see also the Two Secrets to High Performance that every VENTRY Fan user should know! Click here.

NOTE: Wind can make a big difference. No PPV Fan can outblow Mother Nature.

When multiple fans are required, placement side-by-side generally yields more volume while placement one-behind-the-other yields more pressure. This is a simplistic rule, so please call us regarding your specific placement questions.

If you have a large fan and a small fan, again, side-by-side is probably best. If this is not possible, we recommend placing the larger fan in front (closer to the entry point) and putting the smaller fan behind it to seal the doorway.

Click here to read of the Mall experiment in Seattle shown at right.