Close the slide on the Guru fan until it is open only 1/4 the way. That will prevent the natural draft of the cooker from sucking too much air when the fan is off. If you have trouble getting up to temp, open it a little more. The first time I used the Guru on my BGE, I set it for 250° and left the slide open all the way. The fan huffed and puffed until the temp. was 250° and shut off like it's supposed to do... but the temperature kept climbing because the Egg was sucking air through the fan. Closed the slide halfway but it still overshot. With the slide open only 1/4 it doesn't happen. Because the Safe is considerably bigger than a BGE, you will probably need the slide open a bit more than 1/4 but it's a good starting point.
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