I recommend using our Ductless Conversion Kit. Link is below. This will provide you with a 6" round duct pipe, straight stack boot, grille plate, and charcoal filter. This kit will help recirculate and filter the fumes into the attic.

https://www.houzz.com/products/ascension-ductless-conversion-kit-prvw-vr~124092112?lid=92438648

Ok, so buy the hood with a vent included and the conversion kit, right? Will I need an extension piece to go all the way to the attic?

That is correct. How tall are your ceilings? You only need enough extension to get to the ceiling.

9 foot ceilings