What is the distance between bolts and holes for fire exhaust duct?
Ventilation and air conditioning engineering construction quality acceptance specification (GB50243-2002) 4.2.6 stipulates that the medium and low voltage system shall not exceed 150mm, and the high voltage shall not exceed 100mm. Exhaust should be considered under high pressure
No specific requirements, it seems, preferably not more than 20
[1] ventilation and air-conditioning engineering construction quality acceptance specification (GB50243-2002) 4.2.6 stipulates that the medium and low voltage system shall not exceed 150mm, and the high voltage shall not exceed 100mm. Exhaust should be considered under high pressure.[2] flange: flange (Flange), also known as flange or flange. The flange is the part that connects the pipe to the pipe and the valve and is connected to the end of the pipe. The flange is lined with bolts to secure the two flanges. Gaskets for gaskets between flanges. Flanges, threaded connections (wire connections), flanges and welded flanges and clamp flanges.
