Osburn Matrix 1900 Wood Insert OB01900Osburn Matrix 1900 Wood Insert OB01900 High Efficiency Wood Fireplace Insert for Home Heating What are the key installation requirements and benefits of the Osburn Matrix 1900 Wood Insert OB01900 for existing fireplaces? Treat your family to incomparable comfort with the Matrix 1900 wood burning insert. Its magnificent cast iron faceplate is adorned with a patterned upper louver and columns that frame its large door. Its discreet black wooden handle,