A single Automist pump unit has been tested by BRE in an area of 32 meters square, and a ceiling height of 2.5 meters. The Spray-head must be within 5meters of and in the line of sight of any possible fire hazard. If several options are available, the more central location for the mist head is preferrable. Performance data is also available for some variations of this rule, where automatic door closers can be provided.

Automist is LABC registered (RD171) to streamline the Building Control checking and approvals process:

Technical data is available to enable construction and fire industry professionals to assess and specify Automist for a specific risk.

We can help you justify the use of Automist to your Building Control Officer. Certain layouts may require a custom fire engineered justification. We can provide a “formal statement of suitability” or a “technical evaluation and fire development simulation” from a third party fire engineer.

For more details on this service, please contact us

If Automist is being used as a compensatory measure to meet building regulations or to meet fire safety law (as opposed to an elective safety add on) Automist should be specified, commissioned and signed-off by the Fire Fend Ltd or a Fire Engineer .

Which rooms in a property require Automist?

Property Type


Required Automist coverage
Must be judged on a case-by-case basis

Additional requirements
Must be judged on a case-by-case basis

Open-plan 3 storey house

The ground floor area of a three-storey house has the living area open to the staircase.

Automist coverage in open plan living area

Cut-off fire door to keep first floor clear of smoke

Escape windows at first floor
Kitchen separated by fire resisting construction

Open-plan 3 storey house – enhanced layout

The ground floor area of a three-storey house has the kitchen/diner area open to the staircase and no fire door on the staircase.

Automist coverage in open plan living area

Enhanced detection

Escape windows at first floor

Open-plan flat

A flat with bedrooms off one of the living areas, where the floor is above 4.5m from the ground outside.

The open plan living area

Enhanced detection

Property without escape windows

A two storey house or bungalow where the windows are too small for escape, and the living area is open to the escape route from an inner room (for example a two-storey holiday cottage with open plan staircase).

The open plan living area

Enhanced detection

Flat with no internal protected lobby or protected hallway

A flat where the entrance door from a communal stairwell or hallway opens directly into a living area

The room that opens directly onto the communal area

A fire engineer’s report is likely to be needed, which will recommend additional measures

Studio with kitchen by exit

This layout is commonly requested for student accommodation as it confers a better view to the living area of the flat

Entire studio area


Four- or more storey house

Houses with two or more floors that are more than 4.5m above ground level, where there is no alternative escape route from upper floors

Approved Document B recommends all risk areas within the property — some authorities and approved inspectors may follow a different policy

Enhanced detection