Duct Type Smoke Detector Diameter of sampling tube shoule be around 1 in.make 10-12 evenly spaced holes of around 5mm diameter each holes must face the direction of air flow be sure to seal the duct where the tube protrudes comply with nfpa 72.90aand 101
Duct Type Smoke Detector
Duct Smoke Detector Diameter of sampling tube shoule be around 1 in.make 10-12 evenly spaced holes of around 5mm diameter each holes must face the direction of air flow be sure to seal the duct
AW-CSD313