You need to buy a vent hood with a wider chimney. Frankly a ‘chimney’ style hood does not look pleasing crammed into a 30” wide space. Get a hood that fills the whole space.

It’s actually 36 inches. The hood itself is 36 at the bottom but at the top the chimney part is only 13 inches. The style of hood you are showing is very nice but probably costs 5k, I don’t have that kind of budget for a hood. Any cheaper option?

I would also change out that flex pipe you have there now. That traps grease in the grooves, and could be a fire hazard. You need smooth venting.

Can you share a link of what you recommend I get from a store like home depot

I found this https://www.homedepot.com/p/Master-Flow-8-in-x-5-ft-Round-Metal-Duct-Pipe-CP8X60/100172984 and this hood https://www.homedepot.com/p/ZLINE-Kitchen-and-Bath-36-in-700-CFM-Ducted-Vent-Wall-Mount-Range-Hood-in-Stainless-Steel-KECOM-36/206922074 which has 20 inch wide chimney

For that above hood I see it has 16 inch 2 pieces for the chimney. That is too long for my 8 foot ceiling. Is it fine to trim them or do they just stack one on top of the other? Looks like they also have a short kit which is 12x2 for the chimney plus 5 for the hood for total of 29 inch height