I have a basic GR563LXSS Whirlpool electric range with four burners and a "stay warm" element and I'm confused about what CFM I need for a wall mount (chimney) hood. The rule is 10 CFM for each 1000 BTUs. The elements are rated in watts so I looked at the corresponding range in gas (GS773LXS). Total wattage for my range cook top is 7,200 watts. Total BTU's for the gas is 42,000.

Assuming I may have been comparing apples to oranges I Googled conversion charts and came up with this:

7,200 watts = 410 btu/minute (the 410 has similar numbers as the 42,000 for the gas range). It's also equivalent to 24567 btu/hour.

I'm even more confused with btu minutes and hours versus the btu's listed for the range.

So, am I anywhere near correct assuming the simple answer may be that my CFM requirements may be around 420?

We rarely fry foods but frequently sear and saute. FWIW, we use our current fan (ductless OTR MW) only when we generate a fair amount of steam or smoke, not even once a week.

Advice re: brands/models of hoods would be much appreciated. I'm on a limited budget and would like to keep it as close to $500 if possible.