1 System Design

2 Primary Detection Secondary Detection Standards Pipe Design

3 Primary Detection Where smoke will travel when air conditioning is operating Air handling units Duct detection

4 Primary Detection

5

6 Secondary Detection Where Smoke is likely to travel when air conditioning is shut down or not installed Ceiling level detection In cabinet detection Void detection

7 Secondary Detection

8 Standards BS5839 Pt 1 CoP for Fire Alarm Systems in Buildings BS6266 CoP for Fire Protection for Electronic Data Processing installations BFPSA CoP for Category 1 Aspirating Detection Systems

9 Siting Conventional Detectors to BS5839 Pt1 (Secondary Detection) 7.5m Maximum size for fire zone is 2000m 2 Maximum area coverage per detector 100m 2 Grid overlay design concept gives spacing 5 m from walls - detector spacing 10m maximum

10 Conventional Detector Layout (Secondary Detection) BS5839 5m10m 5m FIRE ZONE PLAN 10m 5m

11 HSSD Layout (Secondary Detection) BS5839 Sample Holes Sampling pipes 5m10 m 5m FIRE ZONE PLAN 10m 5m

12 Siting Conventional Detectors to BS6266 EDP Areas & High Airflow

13 Siting Conventional Detectors to BS6266 EDP Areas & High Airflow NOTE: Where the risk justifies the extra cost involved, or the maximum response to fire is required, or as ventilation rates increase, the area of coverage per detector should be reduced. However, under these circumstances, the higher area coverage may still be acceptable if the point - type smoke detectors are supplemented by a high sensitivity aspirating system that forms part of the fire alarm system.

14 Siting Conventional Detectors to BS6266 EDP Areas & High Airflow Maximum size for fire zone is 500 to 750m 2 Maximum area cover per detector 25m 2 Grid overlay design concept gives 2.5 m from walls - detector spacing 5m maximum 5m

15 Conventional Detector Layout (Secondary Detection) BS m5m 2.5m FIRE ZONE PLAN 5m 2.5m

16 HSSD Layout (Secondary Detection) BS6266 Sampling pipes FIRE ZONE PLAN Sample Holes 2.5m 5m 2.5m 5m 2.5m

17 HSSD Duct sampling Return air pipe HART Detector

18 AIRTIGHT FITTING (EG. GROMMET) 2mm DIAMETER SAMPLING HOLES SAMPLE TUBE RETURN TUBE AIRFLOW Detailed view of Duct pipework

19 HSSD Air Handling Unit Sampling (primary) Sampling pipe HART Detector

20 Sampling pipe centred on grilleEnd Cap Grille Distance from grille must be such that air velocity less than 6 m/s Air Handling Unit Sampling

21 Air Handling Unit

22 Air Handling Unit Sampling holes False floor To HART detector

23 Balanced sampling system AHU Cabinets

24 In Cabinet sampling

25 In-cabinet Sampling from Underfloor Void Equipment cabinet Sample tube can detect at different heights Sample tube enters cabinet from underfloor trunk sampling pipe

26 Sampling a Ventilated Equipment Rack Sampling Pipe Ventilation grille Sampling points (Facing into airflow) Equipment Rack Airflow Direction