How to Choose Ultra-Fine Dry Powder

　　Ultra-fine dry powder is an exceptionally fine particulate material with an average particle size of around 5 to 10 micrometers—several dozen times smaller than that of conventional dry powders. It also boasts excellent resistance to reignition, outstanding dispersibility, and superior electrical insulation properties, significantly enhancing its fire-extinguishing performance. Moreover, thanks to its tiny particle size and excellent flowability, this powder can be effectively used in a wide range of settings—suitable for both total flooding in relatively enclosed spaces and targeted, localized extinguishing in open areas. Correspondingly, there are numerous application methods available, including suspended systems, piped network systems, cabinet-type units, and portable models.

　　Today, let's discuss these several application methods of ultra-fine dry powder and how to choose the right one.

　　In ultra-fine dry powder systems, the suspended type is a commonly used configuration. The suspended type, in turn, is divided into two subcategories: pressurized and non-pressurized. And depending on the activation method, it further includes three types: electrically controlled, thermally controlled, and electro-thermally dual-controlled.

　　Pressurized suspension ultra-fine dry powder: The key features of pressurized ultra-fine dry powder include uniform spatial distribution during release, low noise, extended duration, and cost-effectiveness. This type of ultra-fine dry powder is ideal for total flooding fire suppression systems as well as environments where people are frequently present or where fire suppression agents are regularly discharged. However, due to its evenly distributed release pattern, it inherently lacks strong directional control, making it unsuitable for localized flooding fire suppression applications.

　　Non-pressurized suspended ultra-fine dry powder: Non-pressurized suspended ultra-fine dry powder suffers from poor spatial uniformity in releasing the powder, generates loud noise, has a short discharge duration, and is costly. As a result, a single unit is not suitable for total flooding fire suppression systems. However, due to its ability to deliver the ultra-fine dry powder over long distances with excellent release characteristics, it is ideally suited for localized flood-type extinguishing methods or environments where fires spread rapidly.

　　The above outlines the differences between pressurized and non-pressurized systems. Accordingly, we should select the appropriate application method based on the specific characteristics of our protected area. For scenarios involving localized flooding-type fire suppression or areas where fires spread extremely rapidly, we recommend using non-pressurized ultra-fine dry powder systems. In contrast, for enclosed environments and locations where frequent powder discharge is required for firefighting, a pressurized system would be the better choice.

　　Here’s an example: In urban integrated underground utility tunnels, ultra-fine dry powder is the ideal choice for such environments. And when it comes to these narrow, long, and highly complex areas, a non-pressurized system is undoubtedly the best option, given the intricate terrain of city-level underground utility corridors—and especially because, in the event of a fire, flames can spread exceptionally rapidly.

　　When it comes to spaces like computer rooms or electrical distribution rooms, stored-pressure systems are the better choice, as these areas are typically enclosed and confined. This total-flood fire suppression method works exceptionally well with stored-pressure systems, allowing them to effectively deliver their intended performance.

　　As for the discharge mode, the electric control is manual, the temperature control is automatic, and the combined electric-temperature control offers both manual and automatic operation.

　　At the same time, ultra-fine dry powder also has application forms similar to those of heptafluoropropane—namely, piped systems and cabinet-type systems (non-piped). The choice between these two depends on whether the protected area is large in size and contains multiple zones. For scenarios involving multiple protected areas, a piped system is preferable; whereas for single or a few protected areas, the cabinet-type system is more suitable.