Effectiveness is influenced by capacity of unit. If you are trying to mount a 270 cfm fan more than 30" above cooktop, then it may make noise but will do little to clear the air. If it is 1000 cfm, then it can be higher than 30". So the answer is "it depends". Most people don't mount them more than 36" above the cooktop unless it is a really high powered unit.

I had purchased hafele hob 10 months back... I got it serviced 6 times... Now i requested for replacement with new one... Still they have not attended my request...

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So i’m guessing you’re saying that oil paint/enamel paint looks cheap? That makes sense cause whilst i was growing up, the govt quarters came with oil painted doors and it chipped off in a few years in a sorry state. Don’t want that. So oil paint is out? What I’m gathering is that PU paint is not just paint. It’s a process? So you prime and paint(?) first and then do a protective coating of PU with the thinners and the additives? Am I getting this right? :P