How the Excretory and the Respiratory system work together How the Excretory and the Circulatory system work together How the Excretory and the and the Digestive system work together
1 Top vented gas fireplace inserts cost $750 to $3,000, and installation adds another $500 to $1,000. 2  Direct-vent gas fireplaces cost $1,000 to $3,500, plus $500 to $1,000 for installation.
1 They cost about $400-$1,500 plus installation of the gas lines and any desired mantle or surround. 2  Some states do not allow the use of ventless fireplaces or restrict their use. 3  Some ventless models require you to keep a window open while using the fireplace. They cost about $400-$1,500 plus installation of the gas lines and any desired mantle or surround. 2  Some states do not allow the use of ventless fireplaces or restrict their use. 3  Some ventless models require you to keep a window open while using the fireplace.