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MES Air Flow Test

post #1 of 4
Thread Starter 
All MES Owners,

There is a good debate for both using and not using a heat deflector in a MES. Today, I'm smoking a turkey breast and decided to do a little "Unscientific Air Flow Test" of the air movement in the smoker. "Air Flow" is really not the correct term, it "Turbulence" caused by convection heat.

MES Airflow Test

For my "Test", I hung (4) pieces of paper from the 2nd rack, in each of the (4) corners, and turned my MES up to 250* and shut the door. I was amazed to see how much turbulence was caused by convection heat, in the right rear corner. The paper in the RR corner moved rapidly, compared the the other (3). I opened and closed the exhaust vent and the paper in the RR corner consistently moved more rapidly than the other corners. I removed the chip loader, and result did not change, unless I opened up the exhaust vent.

I then placed my granite tile heat deflector on top of the smoke box, and the RR corner moved "Less" than the LR and LF corners. I then moved the tile about 1/2" away from the right inside wall and about 1/4" from the back wall. The result was that all (4) pieces of paper moved at about the same rate!!! It seems that moving the tile to allow a little air flow equalized the 4 corners.

The bottom left side, under the drip pan, showed little to no air flow without a baffle installed, but airflow was increased when I installed the baffle.

There definitely is a "Hot Spot", or at the very least, a "Disproportionate Amount of Air Flow" in the right rear corner of a MES. In my opinion, PignIt's solution to a heat baffle for his MES is right on. I'm heading out to get something like it to try in my MES.


No Creosote! A-Maze-N Smokers

post #2 of 4
Sounds good keep us posted on what you used to fix this issue. Any defendant improvement for the uneven cooking issues would be great.
post #3 of 4
Very interesting, I don't put meat near the hot spot because it dries out and becomes tough.

What size tile did you use?

I have a 30" MES with no window so cannot try your experiment.
post #4 of 4
Thread Starter 

I've used my 12"x12" tile many times, but not necessarily convinced it is the right choice to correct the problem. The heat is concentrated and directed up the back of the unit and up the door. The backside of my MES actually is deformed from heat, where I placed the 12"x12" tile.

I think Pignit has a better solution for a heat baffle, and I'm gonna try something like Pignit's today and post the results.


No Creosote! A-Maze-N Smokers

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