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.).
Gas fireplaces cost anywhere from $2,000 to $5,000 for an installation, depending on the vented or vent-free option selected. Repairs for a gas fireplace can be close to $130, depending on the maintenance needed and manufacturer. In addition, gas fireplaces cost anywhere from 17 to 20 cents an hour to produce a flame.