Please help with hood selection

16 years ago

Ventilation is something that has taken me a while to understand. We are trying to find a 36" stainless pro style hood 18" high that will

a) allow us to use a 3 1/4"x10" duct

b) gives us the option of a vent in the back rather than the top

c) is relatively quiet.

We would prefer to spend between $900-$1500. We are still deciding on a rangetop but based on price are looking at the bertazzoni 5 or 6 burner ( C36500X /C36600X)at 42.5k btu and 49k btu or the dacor millennia DRT366SNG at 85k btu. I have also looked at the Electrolux E36GC75GSS at 77.5k btu. We don't anticipate having more than 3-4 burners on at once so I am not sure if 600 cfm would be adequate with all of there.

The hood will have to be vented with a duct running 6 ft down the wall between the studs and 9 feet through the crawl space before it exits to the outside. We can do an internal or an inline blower (inline would be in the crawl space under the kitchen floor). I would prefer baffle filters.

I have looked online and found the following:

Broan elite E6036SS with 600 cfm internal blower (I have heard the noise level on these can be really high)

Faber Pro Magnum 6059891 with 600 cfm internal blower

Zephyr Tempest II AK7536ASX with 600 cfm internal blower

Kobe CH7736SQB 800 cfm internal blower with only 4.5 sones on high looks great other then fact that it's only 10" tall - it seems that none of the 18" models will allow for a 3 1/4 x 10 duct.

Can we use an inline blower with these and could it be of a different brand? I have read good things about the Fantech FKD 8XL inline blower and the optional LD 8 silencer however that requires an 8" duct and I wasn't sure I am supposed to transition from the 3 1/4 x 10 to the 8" round. Any of the ventilation experts that can help me figure this out?

Any other hood recommendations for us? Thanks in advance!

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Comments (3)

eandhl
16 years ago
Can't speak for the others or the exact Kobe you listed but I have a Kobe - it works great and is quiet. I am pretty sure mine is a 179.
kaseki
16 years ago
Transitions will have pressure loss a bit higher than the duct itself, but so long as they have at least the input duct's sectional area they should not be too noisy or too obstructive. Going to round in the crawl space might be a good idea anyway, even without a silencer. Round duct has the least loss for a given sectional area.

Eight-inch diameter duct has an area of 50 square inches whereas 3.25 x 10 is 32.5. Going to 8-inch should reduce loss overall.

Whether a modest flow rate is sufficient for a modest number of operational burners depends on a lot of details about the exact configuration of the hood interior shape and guts versus the configuration of the pans in use. The flow is not just where one needs it above the rising effluent plumes, but distributed over horizontal sections of the hood interior. Effluent can slide or bounce out of a hood if the effluent velocity (3 ft/s nom.) is higher than the air velocity everywhere the plume has to be captured.

kas
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mwrede
Original Author
16 years ago
Thanks. So going to the 8" round in the crawl space would be a good idea then. We ended up deciding to do a custom hood so we now need an insert and not a hood but we still have the same duct restrictions so any suggestions would be really helpfull.