On Sat, 22 Apr 2017 17:43:03 -0700 (PDT), Steve
wrote:

On Friday, April 21, 2017 at 8:25:07 PM UTC-4, OFWW wrote:

Do you know the recommended square footage for the hood, and the
height off the top of the range and oven so that it can operate
efficiently with the fan you currently have?

What about grease filters and grease traps? The loss of pressure
across the air filters, and is you fan actually rated for use above a
stove?

Is it an inline fan or a canned fan?

These are all critical factors for proper smoke/odor/heat exhaust.
This size of your range has a great deal to do with it.

Will you have a heat sensor in your hood to automatically turn on the
fan when cooking or baking?

Thanks, OFWW-- I do know some of this info, but I'll need to look up the rest.

Height off grates, from what I can tell, can vary-- (but I'll defer to your knowledge.) I bought a bigger model (in CFM) because I wanted to keep it a little higher than the norm, help me retain those lines of sight, and reduce the risk of fire, since I'm using wood to build this thing as opposed to stainless (for example.) I think I'm looking at installation about 34" above the top of the grates...

...but now that I think about it, that statement doesn't answer the question of whether 34" is to the bottom of the insert, or the bottom of my hood's box, which I imagine extends an inch or 2 lower.

in re filters or traps... I think filters, but I'll need to refresh my memory of the exact type. Not sure about inline or canned. I'll need to look that up, frankly. Thank you for expanding my knowledge here!

Yes, the fan is intended for use over a stove... HOWEVER I will acknowledge that it was NOT intended for use in an Island. This was another reason for my up-sizing this purchase to 500 CFM. The Duct is sized properly for this unit @ 6" I understand that I'll need make up air somewhere, too.

The range is "decent sized" but by no means enormous-- it's not one of those 'residential commercial' models or anything. Samsung, 5 burners, 17,500 BTU for the largest, if I recall.

No automatic sensor.

Steve, I see big problems ahead for you, One is you will need to call
Nutone and see that their fans can handle cfm wise per sq foot of open
hood space. Then you also have to factor that in with the height above
the range, between the range and opening of the hood. Otherwise the
fan might work great, it will not draw off the heat and fumes,
rendering the hoods efficiency pretty low.

Also, most all hoods I ever worked on were lined with copper or
stainless steel so they would be washable and inherently flame
resistant. A wood hood is bad as it will soak up grease, oils, and
vapors off the food products, and will also penetrate the wood over
time increasing its flammability.

Regarding filters or grease traps, the framing for those must be
metal, since with heat and grease build up on either traps or filters,
the grease runs downhill and needs a place to collect it and be
cleaned frequently. The edge of the hood should also have a trough
like this.
|
|_| so that the grease and oils trapped on the hood surace can run into
it and stop any possible dripping onto your stove or in your cooking
utensils. Essential if you do any heavy cooking. The trough can have a
slotted drain cup to pull out and clean in between major clean ups.

The of course there is the issue of lighting, covers on hot bulbs so
that they do not inadvertently ignite from the grease caught on them
while the lights are off. Turn on the lights, heat up and possible
fire. Not often, mind you, but it is a safety issue.

Your local sheet metal shop can fabricate a liners or copper, or SS,
with holes already cut for your duct, fans, lights, or electrical
connectors for you lights, complete with trough around the edges and a
5 degree slant to the drain trap box for easy cleanup. The can also
build a filter or grease trap frame for whatever you decide to use.

It can be done, just get your spec's before you design and build.

By all means call NuTone or check their web site for info, or similar
manufacturer, it is not a guessing games, Exhaust fans are rated by
duct size and length as it has to be able to pull free air and push it
through the ductwork. Measured is static inches./cfm