What is the take off of a 6 inch long radius 90?

The take-off for a 6-inch long radius 90-degree elbow typically refers to the distance from the centerline of the pipe to the end of the fitting. For a 6-inch diameter pipe, the take-off length is generally about 6 inches, meaning the end of the elbow would extend approximately 6 inches from the centerline of the pipe. This dimension can vary slightly based on the specific manufacturer and design of the fitting. Always consult the manufacturer's specifications for precise measurements.