Web there is other air that can be part of combustion air, such as “ventilation air,” which is used to ventilate or exhaust an appliance (or fireplace), and “dilution air,” which mixes with the exhaust gases to dilute them.

Wood fireplace air vent. Each type of insert uses the existing chimney to ventilate vertically, terminating at the roof. They actually differ a great deal. This is how your fireplace actually heats your room.

If your fireplace has this lever (usually located on the left inside panel) make sure the outside air vent is in the open (or up) position. It works great but it could be a little better. Place wood in the firebox and light the fire.

You just have to be sure that this vent is open, and then close off any other vents so there isn’t any leakage of fumes inside through them. Check along the top of the firebox until you locate the vent lever. Read the label on the lever to determine which way to move the lever to open the vent, if the lever is labeled.

Fireplace inserts are typically vented horizontally through the roof using an existing chimney. Many of these kits include all the necessary components in one, easy kit! Web open the fireplace vent at the top of the firebox.

So as the air circulates, it heats and comes out as hot air through the top vent. Direct vent fireplaces are typically gas fueled. Web to control a wood burning stove:

The available heat content in firewood is measured in british thermal units (btus). Web you can vent a wood stove completely closed by using the top air vent on your device that’s designed for it. A lot of people (including the install instructions) recommend a fresh air intake.