Pleased with the range hood.  I now have to change the exhaust ducting from 4" to 6" in the spring.  Ducting includes changing a roof 4" vent to a 6". This will allow the hood to operate within its capabilities  At present hood is noisy and is not able to move more air due to back pressure of existing ducting. Overall it is working very well considering my ducting restraints.  My only concern is that a template would have made installation easier.  Will do an update in the spring/summer after changing ducting