Mantel clearances?

[Coldnga]

We are considering a princess PE 29 insert for our downstairs fireplace, the mantle is 21 inches deep and 44 inches from the bottom of the mantle to the hearth. My question is how do I insulate the mantle from the insert because maximum depth is listed as 12 inches by blaze King?

 

[begreen]

That's a deep mantel and a good question for their support staff. They may accept a heat shield on standoffs, hung on the underside of the mantel.

 

[Coldnga]

That's a deep mantel and a good question for their support staff. They may accept a heat shield on standoffs, hung on the underside of the mantel.

Would Rockwool insulation filling the space between the angled heat, shield, and the bottom of the mantle suffice, and what type of sealant could be used to prevent the heat from entering the space?

 

[begreen]

No, an air gap of an inch is all that is needed and that's quite effective. Here's an example:

 

[Coldnga]

Considering the depth of our mantle would a 1 inch standoff be adequate, and is it not required to be sealed around the perimeter? I would think that heat would still enter the space if it were not sealed at the perimeter?

 

[Coldnga]

I failed to mention that the large fireplace opening extends to within approximately 4 inches of the depth of the mantle but the insert would be recessed in the fireplace fire brick flush with the back of the 21 inch deep mantle!

 

[begreen]

Considering the depth of our mantle would a 1 inch standoff be adequate, and is it not required to be sealed around the perimeter? I would think that heat would still enter the space if it were not sealed at the perimeter?

Yes, it would cover the area but it is definitely not sealed. It's the ability of air to circulate behind the plate that keeps it cool.

 

[begreen]

This sounds like a very large fireplace. A picture of the fireplace with dimensions would be helpful.