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2. Direct vent fireplace - Wikipedia

   en.wikipedia.org/wiki/Direct_vent_fireplace

   Direct vent fireplaces operate off of propane or natural gas, and are completely sealed from the interior of the building in which they are installed. Thus, no harmful byproducts are released into the room. They also release much less pollution into the atmosphere than a wood-burning fireplace. [2]

3. Innovative Hearth Products - Wikipedia

   en.wikipedia.org/wiki/Innovative_Hearth_Products

   Their product lines include gas, electric, and wood fireplaces for both indoor and outdoor settings. [4] They also produce additional products and accessories such as fireplace inserts, free-standing stoves, gas log sets, and venting products. [5]

4. Chimney - Wikipedia

   en.wikipedia.org/wiki/Chimney

   A chimney is an architectural ventilation structure made of masonry, clay or metal that isolates hot toxic exhaust gases or smoke produced by a boiler, stove, furnace, incinerator, or fireplace from human living areas.

5. Heating, ventilation, and air conditioning - Wikipedia

   en.wikipedia.org/wiki/Heating,_ventilation,_and...

   Rooftop HVAC unit with view of fresh-air intake vent Ventilation duct with outlet diffuser vent. These are installed throughout a building to move air in or out of rooms. In the middle is a damper to open and close the vent to allow more or less air to enter the space. The control circuit in a household HVAC installation.

6. Fireplace - Wikipedia

   en.wikipedia.org/wiki/Fireplace

   Ventless fireplaces (duct free/room-venting fireplaces) are fueled by either gel, liquid propane, bottled gas or natural gas. [clarification needed] In the United States, some states and local counties have laws restricting these types of fireplaces. They must be properly sized to the area to be heated. [4]

7. Gas venting - Wikipedia

   en.wikipedia.org/wiki/Gas_venting

   Gas venting and flaring that are performed as routine practices are especially wasteful and may be eliminated in many modern industrial operations, where other low-cost options are available to utilize the gas. [3] Gas venting is not to be confused with similar types of gas release, such as those from: