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The little hole won't hurt a thing. The little grooves on the top and bottom is for the cord on an egg turner. If you're not using an egg turner it doesn't really matter if they are lined up or not. The 1602n Hova-Bator is a still air incubator. I did add a fan to mine. The incubator comes with a plastic liner in the bottom of the incubator with reservoirs for water for the humidity.
The little hole won't hurt a thing. The little grooves on the top and bottom is for the cord on an egg turner. If you're not using an egg turner it doesn't really matter if they are lined up or not. The 1602n Hova-Bator is a still air incubator. I did add a fan to mine. The incubator comes with a plastic liner in the bottom of the incubator with reservoirs for water for the humidity.