Insert choice with 8" duct
I am trying to funnel all I have read on ventilation and range hood inserts into a decision that best fits my situation. I don't want to mess this up, and would like to know how you would choose to ventilate in the same situation.
This is similar to a thread that new_morning started recently, except that I will likely be constrained to an 8" duct.
We will have a 42" hood over a 36" range top (BlueStar, 4 burner, griddle). I can make the capture area however deep I need it to be. Duct run is about 8 feet total: up about 3 feet, elbow through a wall, then up and out the roof. There is no place for an inline ventilator, and a remote does not seem be be an option at this point. So, internal ventilator is necessary. I know I will use the ventilation much more at lower speeds than at higher speeds, with occasional needs for significant ventilation. MUA is not a problem for us per GC, DH, HVAC guy, etc.
These are the insert models I am debating between, and the reps I refer to are with the respective companies:
Abbaka - The Abbaka rep recommends the XL pro hood liner with 600cfm and designed with 8" ducting. Rep said that their "good" 600cfm blower should handle my range top. They did NOT recommend transitioning the 10" duct on the 1200cfm insert to my 8" duct. The rep also indicated that they have two types of single blowers, and one is larger and more powerful than the other. They recommended the larger blower for my use. I requested information on the two single blowers so that I could see how they differ. Does this ring a bell for anyone?
Modernaire - PSL-240 - Modernaire rep also recommended using 600cfm, single blower, designed with 8" duct rather than using 1200cfm unit that would require transitioning a 10" unit to my 8" duct. Rep believes that the 600cfm w/ 8" duct will be fine IF my capture area is good. Rep reminded that if I can get 10" ducting, the 1200cfm unit would be preferable.
Prestige - UIB40-1200. This rep recommends the 1200cfm. On this unit, there would be two 6" ducts that open into a rectangle transition piece, and the transition piece would connect to my 8" duct. If I understood correctly, this process would be the same if connecting to a 10" duct. Rep said I might have a small increase in noise with 8" duct over 10" duct which I would expect. "Small" was not defined. :)
Should I do the Abbaka or Modernaire, single blower at 600cfm, with the 8" duct design, making sure I have a good capture area? If so, is one preferable over the other, and why?
Or, should I do the 1200cfm Prestige, with the two 6" ducts going into the rectangle transition, then into my 8" duct? Is the noise at lower speeds in this configuration going to be significantly louder than the units above making the extra cfms a poor trade-off?
Is there a better option that I am missing?