The Kingsman HBZDV4228 Zero Clearance Direct Vent Gas Fireplace will keep you toasty and warm. This fireplace will provide a lot of heat for your living room while also looking amazing! With natural gas, it produces 28,000 BTUs, while with propane, it produces 26,000 BTUs. Choose from a choice of decorative options to create your own unique look while remaining confident in total safety, comfort, and long-term value. A millivolt or intermittent pilot ignition system is available. The millivolt valve system does not use electricity, but it does have a standing pilot that allows operation with hi-low heat and flame control during a power outage. The electronic intermittent pilot ignition employs an electrode to ignite the pilot. When the appliance is not in use, the IPI system guarantees that the pilot flame extends across the burner for rapid activation, and it saves energy. This fireplace incorporates a flame sensor that continuously monitors the pilot flame and shuts off the gas completely if the pilot is not detected. This high-quality fireplace offers the beauty of glowing embers and dancing flames, as well as up to 85 percent efficiency. A pipe inside a pipe (usually 4" inside/7" outside) makes up the coaxial vent system. The interior pipe is used for exhaust, and the outside pipe is used for bringing in outside air for combustion. This special design results in a completely sealed system that does not compromise your home's indoor air quality. It also allows you to horizontally vent a product, which is great for when an appliance is installed on an outside wall). Direct vent appliances are typically limited to a length of 40 feet (with a maximum horizontal length of 15 feet) to ensure proper operation. Available in a 42" width with a Standard Factory finish.