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.

What is inside a chimney?

Inside a chimney you'll find one or more vertical passageways called flues. Ideally, each appliance connected to the chimney (such as each fireplace, each furnace, each wood stove) has its own, separate flue. More than one flue might be contained in one masonry chimney.

What is a chimney flue made of?

Chimney flues have traditionally been made from fireclay flue tile. More recently, stainless steel flues are used in addition to clay tile.

What is the difference between a flue and chimney?

A chimney is a passage way for combustion byproducts to travel up that runs from a fireplace or stove up to the top of a house. It is usually made of stone or brick. Inside the chimney is a flue. In most cases, a chimney flue is made up of a steel chimney liner or ceramic chimney tiles.

How is a chimney constructed?

Built of either brick or stone, traditional masonry chimneys include a firebox (where the wood burns) in addition to a flue, which is the air shaft running through the interior of the chimney, from the firebox up through the roof.

Chimneys Explained #01 - Masonry Chimneys

What sits on top of a chimney?

Chimney Crown – The top of your chimney is called the “chimney crown.” It is designed to protect the chimney's bricks from impairment such as water damage. Chimney crowns are usually constructed of cement.

What is inside a chimney stack?

Typically they will consist of a timber frame or stud work covered with plaster board and a plaster skim. If the false breast contains a flue it may be necessary to line it with a refractory material such as vermiculite.

Whats the hole at the bottom of a chimney?

An ash pit is a hole in your firebox in which old ashes can be placed. Its convenient location allows you to sweep in any ashes and embers, then seal them in by closing a small door. Ash pits are designed to withstand the heat from your fireplace while being easily accessible for the homeowner.

Where does Ash go in fireplace?

A small cushion of ashes at the bottom of the fireplace helps insulate the fire, causing it to burn hotter and longer. You should allow for about an inch of ashes at the bottom of the fireplace.

What is the metal plate in the bottom of my fireplace?

An ash pit is a compartment at the base of the fireplace that holds fireplace ashes. This compartment, usually a cavity surrounded by cinder blocks or concrete, is reached through a small metal access door mounted flush in the fireplace floor or wall.

What are feathers in a chimney?

Chimney flues, constructed within the depth of the external wall, are brought together in the chimney stack and divided by walls known as bridges (or feathers). Sometimes chimney flues were lined with ceramic liners or are coated with a lime mortar during construction (pargetting).

Can you take a chimney breast out?

External chimney stack removal can be done from outside the building and, if done carefully, need not disrupt any internal decoration. An internal chimney breast can be removed at ground and/or first floor without having to remove the external stack.

How do chimneys keep rain out?

The most important part of a chimney that keeps rain out is the chimney cap. Chimney caps are a cover for the top of the chimney that usually has a slight slant. This slant allows rain to slide away from the chimney. Chimney caps are inexpensive, especially compared to the cost of repairing a water-damaged chimney.

Does rain go down a chimney?

Chimneys are subjected to extreme weather conditions such as rain, wind, and snow daily. Over time, these factors can cause structural breaches, leaving the chimney vulnerable to water and moisture damage. Rain can come down your chimney due to damage somewhere on its structure.

What type of brick is used for chimney?

What Type of Bricks Are Used for Chimneys? Typically, clay or calcium bricks are used to construct chimneys. Each brick has different durability based on the mortar and detailing of the chimney terminal. Of course, different types of bricks are better for different types of buildings.

Do chimneys have vents?

Chimney venting is when the by-products of combustion are exhausted through the chimney to the atmosphere. This passageway is called the flue. This applies to both your fireplace (or wood stove), and likely, your heating/hot water equipment.

What is the name of the vent in a chimney?

The flue serves as a passageway for smoke, gas, or other products associated with combustion. It plays an important role in protecting other parts of the home from the heat generated from combustion byproducts, which are produced when burning a fire.

Can a cracked chimney flue be repaired?

If your flue liner is cracked, this is the solution: a stainless steel insert. It's placed down the entire length of the flue, sealing the old liner. It's a job that can be done by a professional in just a few hours.