Smart move on getting a chute ..when I did reefer we had one trailer guys kept getting partial claims with . The first time I pulled it I asked boss where’s the chute he said it didn’t need one but when I sent him pictures of my outside air temp unit that I put in back of trailer he saw the 9 degrees difference from front to back and installed a chute..PS a multi temp often has a short or no chute up front so it’s important to set back reefer to run as well..