Have you noticed, “What did the spec say” is often the fall back when a problem is identified! A robust specification is vital to ensuring all parties remain focused on delivering a compliant solution, and the specification is the lynch pin for all parties to your project. Getting it right from the start begins with our specification. The ingredients of a good specification are:

  • Written with clarity, and includes all relevant details.
  • Identification of the correct standards for the project
  • Guide the user as to how to identify product suitability
  • Incorporate product quality controls
  • Validation of installation
  • Sign off on completion

To this end, we have a suggested wording for specifiers to use for fire ductwork applications, that allow you reflect all the above elements.

For smoke extraction ductwork, the suggested specification can be written as follows.

All Smoke Extract ductwork will be to (hEN) standard 12101-7 and tested to EN 1366-8 for multi compartment or EN 1366-9 for single compartment.

Where multi compartment ductwork is required it must be insulated to the same period of time as the compartment through which it passes as required in DW172. Insulation to be used must be included in the manufacturers test. Alternatives are not acceptable.

A Classification report to EN 13501-4 must be provided. Evidence of a Factory Production Control (FPC) being in place must be provided.

All Smoke Extract will carry CE Marking from July 2013 and is to be installed under a third-party certifier such as Firas as identified in ASFP TGD 18. All ductwork must have classification for testing outside (A), inside (B) and smoke extract (C) in both a horizontal and vertical position.

All ductwork rated “S” for smoke leakage and have been tested to high pressure 1500 PA. All smoke extract will be tested in a flexible wall and be suitable for installation in stud partition, block wall and concrete floor.

All Smoke Extract ductwork will be tested in a flexible wall and be suitable for installation in stud partition, block wall and concrete floor.

All Smoke Extract is to be installed under a third-party certifier such as Firas as identified in ASFP TGD 18.

For Kitchen Extract the suggested specification can be written as follows.
All Kitchen Extract will be to the prEN standard 15871 and tested to EN 1366-1, and must be insulated to the same period of time as the compartment through which it passes as required in DW172:2018 2nd Edition.   Insulation to be used must be included in the manufacturers test.  Alternatives are not acceptable. (Identification of the applicable test standards)

All kitchen extract ducting must be accessible for cleaning and inspection purpose and have a cleaning door (to the same fire rating, and tested in the proposed system) installed every 2 linear meters as stated in DW172:2018 2nd Edition.   The cleaning doors must be as tested in the system.

A Classification report to EN 13501-3 must be provided.  Insulation ratings must be both type B and Type A.  All ductwork must have classification for testing outside (A) and inside (B) in both a horizontal and vertical position.  All ductwork rated “S” for low leakage.  (This helps the buyer request the necessary evidence for product suitability, and quality assurances)

All kitchen extract ductwork will be tested in a flexible wall and be suitable for installation in stud partition, block wall and concrete floor.

All Kitchen Extract Ductwork is to be installed under a third-party certifier such as Firas as identified in the ASFP TGD 18, with a 3rd party certificate issued on completion.  (This ensures a certificate of compliance will be available on completion)

For Fire Rated Duct  for applications other than kitchen and smoke, the suggested specification can be written as follows.

All fire rated and pressurisation ductwork will be to prEN standard 15871 and tested to EN 1366‑1. (Identification of the applicable test standards)

The tests must be conducted both vertically and horizontally for Type A (fire outside) and Type B (fire inside).   All ductwork rated “S” for low leakage. All fire rated ductwork will be tested in a flexible wall and be suitable for installation in stud partition, block wall and concrete floor.  A Classification report to EN 13501-3 must be provided.  (This helps the buyer request the necessary evidence for product suitability, and quality assurances)

All Fire Rated Ductwork is to be installed under a third-party certifier such as Firas as identified in the ASFP TGD 18, with a 3rd party certificate issued on completion.  (This ensures a certificate of compliance will be available on completion)

Feel free to subscribe to our Blog for updates.  Would you like your team to have an approved CPD?  Contact us for access to our training modules.

Need To Know More?

Contact us today to find more about training and CPD from Thor Duct ®.