I was shocked to find that there was no hood/fan above the oven, just a vent with a fart fan. It was absolutely useless for cooking smoke and heat removal. I ordered a Maxair 900 CFM vent and van to replace it. Took me 2 hours start to finish (helps to have rolls of eternabond tape and tubes of self leveling dicor laying around).
Looks and works really well
original fan
new fan