During install, technicians seal duct leaks and balance registers, convalescing airflow, chopping sizzling and bloodless spots

https://www.mediafire.com/file/jm96sr4wzzr96ck/pdf-40820-73911.pdf/file

During set up, technicians seal duct leaks and balance registers, convalescing airflow, lowering hot and bloodless spots, and boosting furnace performance appreciably.