Astec aggregate dryers feature the same quality construction found on the Double Barrel^®. Stationary dryers are used mainly with batch plant facilities. Along with a low pressure oil burner, these units come with the blower burner, automatic burner controls, burner platform, fuel oil pump and ignition platform. The drums are driven by various sized saddle chain or friction drives, based on the drum diameter. The dryers may process up to 500 tons per hour.