Specifications Guide

We have a suggested wording for specifiers to use for fire ductwork applications. 

Kitchen Extraction Ductwork

For Kitchen Extraction ductwork, 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.

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.

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.

A Classification report to EN 13501-3 must be provided.  Insulation ratings must be both type B and Type A.

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

Smoke Extraction Ductwork

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.

Fire Rated Ductwork 

For Smoke Extraction ductwork, 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 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.

All Fire Rated Ductwork is to be installed under a third-party certifier such as Firas as identified in the ASFP TGD 18.

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