When the fire line is weak, the pipe or plastic pipe is used
Fire tube weak 3 hours fire resistance requirements, galvanized iron pipe and brush fire retardant coating can reach the acceptance criteria of the fire department, so please do not use PVC with the plastic pipe and tube, galvanized tube outside to brush fire retardant coating in order to achieve the 3 hour requirement.
The flame retardant PVC plastic pipe, the tubing must be galvanized tube
