12v automotive cooling fans.....draw air through a radiator that is full of 180-220 degree antifreeze, do it all day long 7 days a week said fans pull anywhere up to around 1850cfm, most are in the 1200-1600cfm range
the hot air flow coming off of my griddle will be approx 200-250 degrees after making the 3 foot or so journey up into the hood, this includes being mixed with ambient air on the way..... well within the operating range of a quality fan
now im not saying go out and start installing radiator fans in your hoods, but just by simply sitting and thinking about it for a second, i can see that 12v fans are more then capable of doing the job......
Ok I'm not saying your wrong in any way shape or form, but I had some questions that came to mind when I read your post. But first let me say when I built my trailer I used a ton of common sense. And thank god most (90%) worked out to be correct. But on that 10% I had to re do some parts that just didn't work out as expected. Here are my thoughts and questions....
You said "drawing air through a radiator that is full of 180-220 degree antifreeze"
I'd have to know does antifreeze, change anything? I don't know if it effects the cooling process or not. And I'm not sure who I'd go ask locally to even find out. Just curious.
You also said "hot air flow coming off of my griddle will be approx 200-250 degrees after making the 3 foot or so journey up into the hood".
So your only going to use a flat iron griddle and you don't have any other heat source? They all add up with a cumulative total that brings the interior air temp up dramatically. The entire country has been suffering through an August type heat wave for the last month, and the interior of my trailer has been running around 100 degrees, and some days as high as 115. I have a roof vent exhaust fan the changes the air in the trailer every two minutes. But when your bringing in air that is 95 degrees and mixing it with air coming off my panini grill at 500 degrees, and add on the steam tables (2) and both rib drawers you have increased the total heat a bunch. How much I don't know but even with the high volume turn over in outside air to inside air the interior temp sucks. LOL I really like the side air vents and want to go that direction with my build
but that said we need an experts knowledge/advice, and how many fans vs how powerful they need be to really do the job.
And to those of you thinking oh heck I'll have air conditioning and stay cool....(lmao).... forget it. There is no rooftop air unit going to really cool a mobile kitchen in a midwest summer with all the heat sources and the outside air at 90 or higher. Bottom line is drink lots of water and sweat your ass off all day.
But back to the side vents and using electric fans as described go for it, as long as you have great filters and keep them very clean so your fan doesn't load up with grease, and start a fire or cause your Ansul System to go off, I'm hoping they work out.