Marquis MQRB4436N Installation Instructions Manual page 41

• The Surround Frames are 1" thick, with a 3/4" space behind the frame.
• When using Surrounds, Maximum Thickness for Non-Combustible Facing Materials is 3/4".
• The Fireplace may be covered up to within 1/2" of the Fireplace Opening with non-combustible materials.
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