I installed this range hood in my new kitchen earlier this spring.  Although I had good experience with Proline in my previous kitchen, I decided to try Zline.  I should have followed my instincts.  It turns out that the Zline design allows grease that collects along the inside bottom of the fan housing to drip out at the bottom edges and onto the baffles and then the cooktop below.  See photos.  My previous Proline did not have this problem and when you factor in that their fans that are cleanable & serviceable without taking the entire hood off the wall (which would have saved me here), I regret not going back to Proline again.  I asked Zline for help but as expected they told me that I will need to take the hood down to clean it.  We do quite a bit of cooking greasy stuff so we use the hood a lot.  So it seems I will need to take the hood down about every six months to fix this.  Seriously?   Hope this helps with your decision.  Cheers, Dan in Denver