That is not a simple or easy duct run. What is that duct size? What is the CFM of the blower? You have more issues than Sound.

That looks like a 6" diameter duct to me, but it could be the photo making it look small. If it is 6", it needs to be swapped out for an 8" or 10" diameter duct (depending on your blower's cfms). The duct's length and several turns will affect exhaust efficiency also. Since you are lucky enough to be able to design from the studs (many of us are stuck with a configuration already in place), why not put the range in a spot where you don't need to run the duct for it around the corner and then all the way across the room?

Please describe the range. Is it a dragon's-breath Bluestar 48" gas range? Or is it a 30" induction range? Your range will dictate how powerful your exhaust needs to be, and then you can go from there in deciding cfms, and whether you will need makeup air.

You should post your kitchen layout on this forum--under a separate thread--and ask the design gurus here for some help. There are some very talented people here who are generous with their time.

Why can your ductwork not go straight up, through the roof. That is the most direct and efficient route. Too much horizontal ducting and turns leads to internal grease deposits and a big loss of actual CFM. In addition, the ductwork does appear small, which chokes down even a high CFM hood into whistling noisiness.

I have a similar setup but not nearly as long. Going by the picture, mine is about as long as from the start, which looks to be on the right side of the picture, to the white plumbing pipe and then out that wall. I used an expander to go to a 10" duct. No silencer and no noise issues whatsoever with a Vent-a-Hood.

The duct is 10 inch diameter duct. There is a bedroom above the kitchen so no going through the roof.

Oh yeah and 48 inch wolf with grill. Getting 1200 cfm hood.

Can you post an overal layout of the kitchen as it relates to the rest of the home and the exterior? A shorter run would be MUCH better. I'm wondering what is behind the wall with the plumbing vent in it? I'm also wondering about the range location in relation to the exterior.

What is your plan for make up air? Do you live in a cold climate where it will be required to be heated?

This is the closest exterior wall. From reading all the posts on houzz, 10 foot run seems short compared to what I hear most people have?? Will a silencer and inline blower be worth it in this scenario vs. standard vent hood?

10' with that many turns is not a short or effective run. You have cut the effectiveness by 1/2. It will be loud, no matter what you do. There is no way around 1200 CFM of moving air with that much turbulence introduced into the flow dynamics not being loud. Save your money. For ear plugs.

Thank you for your help! I was a little taken as well by some of the comments-some downright rude!

The problem with forums is that because there is no vocal inflection or body language, it's very hard for a non-professional writer to convey the correct tone. I'm pretty sure that they wouldn't sound rude if you were talking face to face.

Not trying to be rude. Trying to find you a better solution that would help with your concern over noise. Short straight runs are the most effective and the quietest. Adding turns adds turbulence and cavitation. Noise. Adding length adds noise. If a better configuration can be found to get the ductwork outside, it will be quieter. As in, could it go straight up through a bedroom closet. Or convert to a square duct and go up and out through a stud bay? I've done both.

The location for the make up air can also add noise to your kitchen. Where is that going to be ducted to, and what capacity CFM have you planned for there?

Not sure about short straight runs being the quietest ... I have the shortest run possible, less than 12", and the fan (Thermador 48") sounds like a helicopter is hovering over the house. We are gutting the kitchen and a new quiet fan is in the plans!