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Venting Methods

All of Empire’s zone heating appliances allow you to efficiently warm the rooms you use most.  Zone heating saves energy and money by letting you turn down the thermostat on your central furnace.

Empire offers zone heating systems in Direct-Vent, Vent-Free and B-Vent. Each has its own advantages. Your dealer can recommend the system that’s right for your home.


Direct-Vent systems use two vent pipes. One draws air in from outdoors to support combustion. The other exhausts the by-products of combustion to the outside. The two vent pipes may be concentric (exhaust pipe within a larger diameter intake pipe) or co-linear (separate pipes of about the same size).

Combustion takes place inside a sealed chamber with a glass front in the case of a fireplace. Room air circulates around the combustion chamber, often assisted by a blower, to heat the room.

A DV system is often installed along an outside wall to simplify the vent run but can also be installed elsewhere in the home and vented through the roof.




A Vent-Free system uses room air for combustion and delivers 99.9% of the available heat energy directly to the room. VF systems have an unmatched safety record, thanks in part to their clean-burning technology and their Oxygen Depletions Sensor, which instantly shuts off the valve if oxygen in the room drops to an unsafe level. Because no venting is required, VF systems offer more installation options.

VF systems are limited to 40,000 Btu and must be operated as supplemental heating sources in conjunction with a central furnace that circulates air.



A B-Vent system takes in room air to support combustion and exhausts combustion by-products (along with much of the heat) to the outdoors through a single vent pipe – usually through the roof or through a chimney.

Because they are relatively inefficient, compared to a DV or VF system, most B-Vent fireplaces are rated as decorative appliances. They provide the ambiance of a fireplace without overheating your rooms.


  • Ideal for replacing a woodstove or oil burner – eliminates handling solid fuel
  • Can operate with a simple remote (no thermostat)
  • Usually less expensive to buy and install
  • Choose fireplace, heater, or burner and log set