Fire Door-Fan Manual | Canon 2000 specification

Mixing or No Mixing (Descending Interface) or Extended Discharge

Mixing means that as agent leaks out the incoming air is continually mixed with the remaining agent in the room so that the concentration is constant throughout. Mixing gives equal protection to all levels in the enclosure. Sometimes the air-handlers must remain running during the retention time to keep equipment cool. Other times mixing must be used because protection is required at high levels. Often mixing is unintentionally created by convection currents caused by hot equipment of equipment cooling fans that must remain on during the retention period.

The initial concentration must be made greater to allow for the drop in concentration.

This icon is used throughout the program and on reports to show that mixing will take place.

To determine if there is mixing, a smoke test must be performed where small puffs of smoke are placed near the protected equipment. If the smoke puffs immediately dissipate, there is continual mixing. If in doubt, it is possible to pass both the mixing and the no mixing cases.

No Mixing or Descending Interface means that as agent leaks out the incoming air is NOT mixed with the remaining agent in the room so that a layer of air forms on top of the agent. NO Mixing gives protection only below the air-agent interface.

The greater the initial concentration, the faster the agent will be lost.

This icon is used throughout the program and on reports to show that NO mixing will take place.

2000 Fire Door-Fan Manual

updated 2002-05-28

Page 32 of 58

2000 specifications

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