Vented fireplaces are further divided into two subcategories natural vent and direct vent.
													
																	B vent fireplace vs direct vent. 
									
	
		
	
																	In general b vents do produce less heat than direct vent models. 
																	Direct vent appliances are typically higher in efficiency than b vent appliances and put out a lot of heat even with a low flame setting but still do not produce as much heat as their vent free counterparts. 
																	A b vent must be vented vertically and uses fresh air from inside the home to provide oxygen to the fire. 
																	Natural vent models resemble conventional wood burning fireplaces. 
															
													
									
	
		
	
																	If you desire a realistic looking flame a b vent may be a good choice for you. 
																	Direct vent appliances are typically higher in efficiency than b vent appliances and put out a lot of heat even with a low flame setting. 
																	Well visually some people prefer b vent units because their open they have access to a lot of oxygen and you can generally get a nice big visual flame but you can also get a nice flame on a direct vent. 
																	The b vent pipes used in natural vent fireplaces are however smaller than the a class chimneys used in traditional wood stoves. 
															
													
									
	
		
	
																	Direct fireplaces have a sealed glass front and typically a smaller flame than a b vent fireplace or a vent free fireplace. 
																	A direct vent has a sealed glass front and pulls all of its fresh air from outside the home. 
																	Natural vent or b vent gas fireplaces and stoves use the air that is already contained inside of a room for combustion. 
																	Even the vent pipes are almost the same. 
															
													
									
	
		
	
																	Gas vent fireplaces exhaust their fumes through the roof via a pipe. 
																	This makes b vents an optimum choice for small rooms since the energy output of a direct vent fireplace can overwhelm a small space. 
																	Because the design of a b vent system is simple it is typically less expensive to install than a direct vent fireplace system. 
																	Direct vent systems use indoor air for combustion. 
															
													
									
	
		
	
																	Direct vents can be vented vertically or horizontally through an exterior wall. 
																	Direct fireplaces have a sealed glass front and typically a smaller flame than a b vent fireplace or a vent free fireplace.