I built my shop last year. After getting a quote, I installed it myself. A friend on my who is an air systems engineer designed the system (duct sizes and location, BTU and AC size). One of the things he recommended was to upsize the blower due to the 10’ ceilings. The system works great, better than the professionally installed one in my house. I used a 95 plus natural gas furnace, that has sealed combustion. A concentric vent brings in fresh air for the unit to burn and exhausts the gases. It took me two weeks to do both floors (the furnace is located upstairs). I also installed cold air grills that have a filter rack built in, this help keep the sawdust from being sucked through the return pipes. When it was done I saved approximately $6,000.