Automist testing

Fire performance data



Why are the Automist nozzles mounted at a lower level?

Traditional sprinklers mount on the ceiling, as a result, the water droplets have to flow (with gravity & momentum down) against the fire & smoke to reach the fuel, which flow upward. This also means when they activate they can also drag down the smoke layer on the ceiling reducing visibility.

In contrast, Automist through its side wall delivery is able to utilise the buoyancy of the fire plume to suck the mist in and suppress fires. Its lower position and early activation means it only needs 5.6 litres per minute to suppress fires which would require ten times as much with a traditional sprinkler solution. This means installation is easy and it does not require a large tank or water main upgrade, which can be a significant cost barrier.


Water mist entrained
  • Figure 1: Relatively large droplets are denoted I, medium sized droplets are denoted II, very small droplets are denoted III.
    The situation denoted IV is when medium sized droplets are following entrained air and combustion products into the fire plume.

A water droplet should ideally evaporate inside the fire plume, instead of in the hot layer above it, to be most effective in cooling and inerting the flames. If a droplet is entrained and flows upwards together with the gases inside the plume, it will evaporate quickly whilst in contact with the hottest part. Upon losing its upwards momentum inside the fire plume, it will fall back driven by gravity. It is then possible to utilise the unevaporated droplet twice!

Free Technical Information Pack

Download our Technical Pack which contains information detailing how Automist® uses a high-pressure pump to provide whole-room watermist fire protection. It shows how Automist® can be retrofitted without major disruption. Provides links to download third party reports of the extensive testing conducted by Exova Warringtonfire. Automist Smartscan® has met the fire performance standards outlined in BS 9252 and BS 8458, the UK equivalent to UL 2167.

The Automist® sprinkler alternative technical Information pack includes:

  • Flyers.pdf

  • Product Handbooks.pdf

  • Independent 3rd party test reports from the Exova Warrington UKAS Laboratory.pdf

  • Declaration of testing and conformity.pdf

Free Download
Automist technical download

A fire suppression device like Automist ® aims to control and suppress fires, significantly reducing the risk of injury, life loss and property damage by maintaining tenable conditions for as long as possible while occupants evacuate. This is achieved in several ways:

  • Reduction of room temperature in the region of the fire. Water mist devices achieve this by consuming much of the fire’s energy in converting water to steam.

  • Reduction of smoke and toxic gases. Water mist devices achieve this by the production of copious amounts of inert steam in the immediate vicinity of the fire, locally excluding oxygen, reducing temperatures and thus slowing the oxidation reactions of the fire.

  • Flashover prevention. By constraining room temperatures to around 212°F or less, flashover (the rapid ignition of combustible items in the room) is prevented.

  • Providing cooling to structural elements of the home that are in the spray path, allowing them to resist the fire for longer.