Does anyone know the exact size the hearth has to be for a englander 30? I looked in the manual and it says48" x 48" for the stove but then it says you have to have 8" on the back and sides and 16" in front...if i went by that...the pad would be smaller than 48" x 48" . . the depth would be the same but the width would be 8" narrower... I dont want to take up anymore space than i have to...thanks