I bought range hood that was meant to be used with the tube but I need it to be ductless. How can I cover it??
I don’t think you can. Ductless has a specific fan motor and filter system.
Probably not. Some hoods can be installed ducted or ductless per instructions. If your hood does not have a grill in the front for air to escape then it is only ducted and cannot be changed.
If you cover it, how will it function?
If you need it to be ductless because you can’t get the duct to release outside of your house, you could possibly duct to your attic or crawl space.