Hansen's disease, also known as leprosy, is a chronic bacterial disease that primarily affects the skin, peripheral nerves and upper airway.ansen's disease, also known as leprosy, is a chronic bacterial disease that primarily affects the skin, peripheral nerves and upper airway.
1 Direct-vent gas fireplaces cost $1,000 to $3,500, plus $500 to $1,000 for installation. 2  The cost of a ventless gas fireplace is $500 to $2,500, and while there are additional installation costs, you may pay extra for finish work (such as a mantle, marble surround, etc.). The cost of a ventless gas fireplace is $500 to $2,500, and while there are additional installation costs, you may pay extra for finish work (such as a mantle, marble surround, etc.).
1 A mason-built brick fireplace costs $3,500 to $5,000. 2  If installing a gas burning fireplace, plan on spending $750 to $1,000 for a gas log kit.  The addition of a new chimney might cost $60 to $100 per linear foot for an engineered chimney and $100 to $200 per linear foot for a masonry chimney. For a 10â chimney, thatâs an average cost of $600 to $1,000 and $1,000 to $2,000, respectively.