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Firesafe Standard Specification

In order to ensure Firesafe fire rated ductwork is correctly specified, several factors
should be carefully considered.

    1. Define the type of system - Smoke extract, car park extract, kitchen extract, pressurisation, general ventilation, dual ventilation/smoke extraction system.

    2. State the fire rating to BS476 Part 24: 1987 in minutes for:

    (i) Stability

    (ii) Integrity

    (iii) Insulation

    3. Define if the system is Duct Type A (Fire Outside) or Duct Type B (Fire Inside and Outside).

    4. Define the operating pressure limits of the ductwork as defined by HVCA specification DW144.

    Low
     

(Class A up to 500pa positive or 500pa negative )

    Medium
     

(Class B up to 1000pa positive or 750pa negative)

    High

(Class C up to 2000pa positive or 750pa negative)

    5. Define the requirements for access doors requirement for maintenance and
      cleaning as defined by HVCA specification DW144 table 25.

     

Pro-Forma Specification

 
The .....(1) ..... ductwork should be Firesafe fire rated duct as manufactured
and installed by C Caswell Engineering Services Limited to comply with BS476 Part 24 (1987)
for .....(2)..... mins stability .....(2)..... mins integrity and .....(2)..... mins insulation.
The ductwork should be capable of providing type .....(3)..... fire containment and under normal
operating conditions should conform to .....(4).....pressure classification of the current HVCA DW144
specification access doors for maintenance and cleaning should conform to HVCA DW144
table 25 .....(5).....
 

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