Available options on the HBZDV 42” fireplace include overlay/designer doors, heat activated blower kit, thermostat, remote control and much more! This 42” built-in fireplace has a fully sealed combustion chamber with no pollution spillage to depreciate the indoor air quality of your home. The Millivolt Valve system allows operation during a power failure supplying heat when you need it most. A flame sensor that constantly monitors the pilot flame provides 100% gas shut off if the pilot is not sensed. Available in both natural gas and propane models.