I'd say 4.8 but that's not an option. My only issue with this is that it didn't just "fit" in the opening where the old cinder dump door was, I would have to grind 1/8" to 1/4" of the brick to fit it. However, it's very well made, much better than the old warped steel I just threw in the trash. I'm sure it will last the life of this house or longer! Very good.
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