We had an Oslo installed recently, and it is a hearth mount sitting on edge of hearth of former heatilator hearth. There is a wooden mantle which has a heat shield attached to protect mantle. The mantle itself stays cool, but the trim beneath the mantle which is unprotected, gets so hot that you cant hold your hand on it when the stove is 400 degrees or higher. I measured the distance between top of stove and trim and it is around 10 inches. Not sure what the manual says about clearances because I dont have it here and cant look it up online because my computer is a dinosaur. Thanks for your input. Picture was taken before any mantle shield was installed.