The circular intake looks to be 11, so. Fit 12' ducting and the grate where it exhausts is roughly 10" by 12". So as it sits now you could install it outside and run ducting to intake side which will exhaust right out the grate area.
Or you could possibly install inside and then run ducting off both sides. It has a belt driven electric motor.
Please use zoom feature to see more detailed condition. It is a little dusty from being stored. The item "New Greenheck 07-BISW-21-X-10-I Industrial Centrifugal electric Exhaust Fan" is in sale since Monday, March 5, 2018. This item is in the category "Business & Industrial\HVAC & Refrigeration\HVAC & Refrigeration\ Parts & Accessories\HVAC & Refrigeration\ Fans & Blowers". The seller is "cdryard" and is located in Mount Vernon, Washington.
This item can be shipped to United States.