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2. Gas heater - Wikipedia

   en.wikipedia.org/wiki/Gas_heater

   Gas heater. A wall mounted gas heater that runs on either propane or natural gas. A gas heater is a space heater used to heat a room or outdoor area by burning natural gas, liquefied petroleum gas, propane, or butane . Indoor household gas heaters can be broadly categorized in one of two ways: flued or non-flued, or vented and unvented .

3. Fireplace - Wikipedia

   en.wikipedia.org/wiki/Fireplace

   Fireplace. A fireplace or hearth is a structure made of brick, stone or metal designed to contain a fire. Fireplaces are used for the relaxing ambiance they create and for heating a room. Modern fireplaces vary in heat efficiency, depending on the design.

4. Duct (flow) - Wikipedia

   en.wikipedia.org/wiki/Duct_(flow)

   A round galvanized steel duct connecting to a typical diffuser. Fire-resistance rated mechanical shaft with HVAC sheet metal ducting and copper piping, as well as "HOW" (Head-Of-Wall) joint between top of concrete block wall and underside of concrete slab, firestopped with ceramic fibre-based firestop caulking on top of rockwool.

5. Passive ventilation - Wikipedia

   en.wikipedia.org/wiki/Passive_ventilation

   Passive ventilation is the process of supplying air to and removing air from an indoor space without using mechanical systems. It refers to the flow of external air to an indoor space as a result of pressure differences arising from natural forces. There are two types of natural ventilation occurring in buildings: wind driven ventilation and ...

6. Heating, ventilation, and air conditioning - Wikipedia

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

   Heating, ventilation, and air conditioning ( HVAC) [1] is the use of various technologies to control the temperature, humidity, and purity of the air in an enclosed space. Its goal is to provide thermal comfort and acceptable indoor air quality.

7. Ventilation (firefighting) - Wikipedia

   en.wikipedia.org/wiki/Ventilation_(firefighting)

   Ventilation (firefighting) Ventilation is a part of structural firefighting tactics, and involves the expulsion of heat and smoke from a burning building, permitting the firefighters to more easily and safely find trapped individuals and attack the fire. If a large fire is not properly ventilated, it is much harder to fight, and can build up ...