Mine has 3, as well as 3 sets of U-bolts to hold the grates. 3 can be symmetrical- 120 degrees apart. The number isn't as important as the amount of square inches of intake. You could have one big one. I find it easier to plug less holes. I have 1" diameter holes, and mine runs about 375-400 with them all open, and a fully engaged fire. With 2 plugged, mine seems to run about 225 for hours and hours.
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I'm very intelligent, but I mask it by doing stupid stuff.
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