THIS PRODUCT DOES NOT COME WITH A TOP COVER.  YOU HAVE TO BUY THAT SEPARATELY.  YOU CAN FIND IT IN THE SMALL PRINT OF THE INSTALLATION MANUAL, WHICH IS POORLY WRITTEN. 
 IT IS A LOW QUALITY DESIGN IN THAT THE DUCT CONNECTS POORLY WITH THE CANOPY.  WHERE THERE SHOULD BE SCREWS OR SOME OTHER FORM OF ATTACHMENT, IT CONNECTS WITH LITTLE PIECES OF BENT METAL THAT ARE INADEQUATE FOR THE PURPOSE.  NOT EXACTLY AN ENGINEERING MARVEL.