Hi John
Thanks for contacting the Answer Army to post your questions.
The specs for the 150 BT are 434 cubic feet of air per minute (CFM) at a rate of 215 MPH
The specs for the 350 BT are 692.17 CFM at a rate of 180 MPH
The difference in the specifications is due to the pipes that the blowers use, as a pipe that terminates with a larger opening will move air at a higher volume (CFM) however the velocity (MPH) of the air will be reduced.
Thanks again for contacting Husqvarna.
Hi John
Thanks for contacting the Answer Army to post your questions.
The specs for the 150 BT are 434 cubic feet of air per minute (CFM) at a rate of 215 MPH
The specs for the 350 BT are 692.17 CFM at a rate of 180 MPH
The difference in the specifications is due to the pipes that the blowers use, as a pipe that terminates with a larger opening will move air at a higher volume (CFM) however the velocity (MPH) of the air will be reduced.
Thanks again for contacting Husqvarna.