Wood Fireplaces and Stoves

Traditional wood fireplaces and stoves have been used for centuries. Traditional fireplaces are very inefficient in heating a room, as they primarily use radiant energy to provide warmth.  Traditional fireplaces and stoves use the air from the room to provide oxygen for combustion. Wood fireplaces are available in a wide variety of styles and building materials.  Wood burning stoves also are available in a multitude of styles colors and features, based on your heating needs.  Wood burning appliances  require a class A chimney.  The chimney may be built of masonry or of double lined steel.  There are options to consider for both wood burning fireplaces and wood burning stoves.

Wood Fireplace Options

Traditional fireplaces, constructed of firebrick and mortar, are designed to burn logs.  The styles and sizes of fireplaces are as varied as the architects who have designed them.  Traditional fireplaces are usually built onsite utilizing brick masons, cinder blocks, fire brick and ceramic flues.  The chimney of the fireplace needs to extend above the highest point of the roof to avoid downdrafts. The size and weight of a traditional fireplace requires a substantial and stable foundation.  Usually traditional fireplaces are built during new construction.

Fireplace inserts have gained in popularity, as they are much cheaper and lighter than traditional fireplaces.  Fireplace inserts are built in factories and shipped pre-assembled to the home, resulting in less labor costs for installation.  Wood fireplace inserts also are designed to be installed next to wood materials, with close clearances, allowing wood framing to be used in chimney construction. Many metal fireplace inserts have air ducts and fans to increase the amount of heat transferred from the fire.

Both fireplace inserts and traditional fireplaces require the installation of flame proof  hearth on the floor.  The hearth is required to prevent logs that may roll out of the fireplace from setting the floor on fire.

Wood Stove Options

Traditional wood burning stoves are made of cast iron.  Antique stoves are not air tight, preventing accurate regulation of the fire. Because the flame is hard to regulate, more heat is lost in the flue gases, reducing the stove’s overall heating efficiency.  The thick cast iron used in construction of older stoves allows an extremely long useful life.  Stoves built in the early 1800’s are still in use with little restorative work.  An ornate antique stove from the Victorian era could be a main architectural feature of a house.

Airtight stoves became popular during the 1970’s because of their greater efficiency.  One load of wood could be set to burn all night. The advantage of the airtight stove is in the long burning time and greater fuel efficiency.  Less heat is lost up the chimney.  Also, modern airtight stoves have catalytic converter options that help reduce the amount of creosote and other unburned gases going up the flu.

Both types of wood stoves need to be placed on fireproof surfaces.  Because of the radiant heat emitted, adequate clearance of the stove from flammable walls, floor materials and fabrics needs to be maintained.

Both wood burning fireplaces and stoves provide an impressive architectural feature for a room.  A well built fireplace or stove could be an added source of heat for your house.

Variety of Fireplaces

Fireplaces have been a traditional architectural feature of a house.  Fireplaces originally provided heat for cooking as well as keeping the house warm. Fireplaces kept the same basic design for thousands of years.  In the 16th century, the idea of raising the wood on a grate improved the heating effectiveness of the fireplace.  Ben Franklin implemented the next improvement in fireplace design.  The Franklin stove, built out of cast iron, captured more heat from burning wood.  Count Rumford modified the fireplace by creating a tall, shallow box, resulting in greater radiant efficiency.  Now, fireplaces are available with advanced options and features to meet any design or lifestyle need. The following five fireplaces are the most popular:

Wood Burning Fireplaces

Wood burning fireplaces are either masonry or factory built inserts.  Masonry fireplaces are labor intensive, and are built on site out of fire bricks, cinder block, clay chimney liners and brick or stone, depending on the surround. Masonry fireplaces usually include a hearth, mantel, grate, firebox, and damper.

Fireplace inserts are manufactured off-site and are easier to install.  Fireplace inserts use a double walled steel chimney that is light and easy to install.

Gas Burning Fireplaces

Gas burning fireplaces come in a huge variety of styles to meet any decorating requirement.  There are three major types of gas burning fireplaces: Direct vent, vent free, and inserts.  Gas burning fireplaces may be double sided, or any unique shape to make a design statement for a room. Direct vent gas fireplaces use outside air for combustion.  Since gas fireplaces have electronic ignition, some have remote controls or thermostats to create a comfortable room temperature.

Vent free fireplaces  provide greater options for placing fireplaces in rooms that may not have access to an outside wall or for a chimney.  Vent free fireplaces are extremely efficient, as no heat is lost through flu gas.  However, the room supplies the oxygen needed for combustion.  Some building codes require fresh air sources for vent free fireplaces.

Direct vent fireplaces use outside air for combustion.  This type of fireplace has the option of venting through a wall to the outside instead of a chimney, reducing labor for installation.  Advanced Do-it-yourselfers may be able to successfully install a direct vent fireplace, with the help of a plumber for the gas connection.

Pellet Fireplaces

Pellet fireplace inserts have become more popular as a source of heat for a room and because of the improved efficiency of a pellet fire over a traditional log fire.  Pellet fireplace inserts are available for new installations and retrofits into older masonry fireplaces.  Pellet fireplaces offer the advantage of a controlled burn through pellets supplied through a hopper to the firebox.  Some models are thermostatically controlled with electronic ignition.

Electric Fireplaces

For convenience and ease of installation, electric fireplaces offer new alternatives.  The new electric fireplaces have a more realistic appearing fire than in earlier models.  Most electric fireplaces have built in electric heaters to help provide warmth to a room.

Gel Fireplaces

A vent free gel fireplace provides the option of a real fire with the portability of an electric fireplace.  Gel fireplaces are starting to increase in popularity with buyers who want a real fire, but want the ease and mobility of an electric fireplace.

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Posted by admin on February 5th, 2011 :: Filed under Fireplaces
Tags :: Fireplaces, Stoves, Wood

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Seal Fireplace Dampers With Weatherstripping to Conserve Energy

Introduction

When fireplaces are not being used, they should be sealed with weatherstrip to air seal the damper and prevent wasted energy. The common perception should be that just like doors and windows, fireplaces require weatherstripping to prevent energy loss.

Leaking Fireplace Dampers Waste Energy

Fireplaces are the largest intentional opening in the home, costing U.S. families over ,100,000,000 (based on figures as of March 2005) each year in wasted energy costs.

Like a door or window, fireplaces are openings to the outdoors and should be weatherstripped to prevent the loss of heated and/or cooled air.  By weatherstripping the fireplace, several benefits are achieved including improved comfort, energy conservation, reduced energy costs, reduced noise, and improved indoor air quality.

Fireplace dampers are not effective at sealing the fireplace. When dampers are closed they do not provide an air tight seal and are quite ineffective at controlling undesired air leakage. Most fireplace dampers are left open. A study showed that 80% of fireplace dampers are inadvertently left in the open position1. Many fireplaces have broken and/or missing dampers.

In a 1990 study designed to measure the leakage area of fireplace with and without the damper closed, Energy Options Northwest had this impressive finding; the effective leakage area (ELA) of the fireplace dampers averaged about 30 square inches when closed. As a frame of reference, the total ELA of typical houses built to moderately tight standards is between 70 and 120 square inches. These results demonstrate that by weatherstripping the fireplace, the total effective leakage area (ELA) of the house can be reduced by 25 – 43%.

Another research study performed in Europe showed similar results. The study showed that an open damper on an unused fireplace in a well-insulated house can raise overall heating and cooling energy consumption by 30%2.

The majority of energy loss in the home is due to air leakage. Air leakage, or infiltration, occurs when outside air enters a house uncontrollably through cracks and openings. Properly air sealing such cracks and openings in your home can significantly reduce heating and cooling costs, improve building durability, and create a healthier indoor environment.

Building scientists and other experts agree that a significant amount of energy costs are wasted due to air leakage. Warm air leaking into the home during the summer and out of the home during the winter waste a substantial amount of energy dollars. See the collection of web references at the end of this paper.

According to the U.S. Department of Energy (DOE), the typical U.S. family spends approximately ,300 a year on home utility bills, of which 44% goes for heating and cooling (as of March 2005). In fact, the average American household’s annual utility bill expected to rise to about 00 by 20153.

Inadequately sealed fireplaces are noted as being one of the worst air leakage sources in the home. According to the D.O.E.4, by weatherstripping the fireplace, the typical U.S. home can reduce air leaks by 14% or more.

According to 2004 US Census Data5, there are 76,217,000 family households in the U.S. By multiplying the number of family households by the typical savings possible by weatherstripping the fireplace, the total annual energy cost savings that can be achieved by weatherstripping fireplaces is ,100,000,000. This incredible amount can be expected to rise to ,400,000,000 annually by the year 2015.

Of course not every home in the U.S. has a fireplace. However this only serves to increase the energy cost burden for the homes that do have fireplaces.

According to estimates there are 33,000,000 fireplaces in the U.S. By dividing the total annual energy cost savings that can be achieved by weatherstripping fireplaces by the number of homes with fireplaces, the average annual savings that can be achieved by weatherstripping the fireplace would conservatively be about 0 – 0 per fireplace.

Not Just Heating Losses Occur – Consider Air Conditioning Losses

Energy loss through fireplaces is not just heat loss. Fireplaces can also cost wasted air conditioning.

Consider a typical home that is provided with central air conditioning, and a fireplace. Air leaks in and out of ducts at all the connections within a system (e.g. at plenums and behind registers)6.

Of course this leakage means that air that occupants have paid to have heated or cooled escapes from the heating or cooling system and does not heat or cool the house. Air leaks into the heating or cooling system increase the amount of outside air that must be heated or cooled. Outside air is usually cooler (for heating) or warmer and more humid (for cooling) than air inside the house and the heating or cooling capacity of the system is then used to heat or cool this outside air instead of the air in the house. These issues are well documented and well understood.

But these air leaks also force air through the fireplace. How? By the pressure differential created by the duct leakage. Depending on where the duct leak is, it can cause a slight reduction or increase in the pressure inside of the home. Because the fireplace is a wide open hole to the outdoors, this will cause your air conditioning to either push air out of the fireplace, or worse, suck air in through the fireplace bringing odors and toxins in with it. 

Other Benefits of Sealing the Fireplace

By weatherstripping the fireplace, several benefits are achieved, including improved comfort, energy conservation, reduced energy costs, reduced noise, and improved indoor air quality.

Un-weatherstripped fireplaces allow annoying and uncomfortable downdrafts. Back drafting brings cold air in winter that must be heated, and warm air in summer that must be cooled. Smoke particles and soot from a fireplace can enter into the living space, contributing to odors, poor indoor air quality, asthma, and other undesired problems.

When the fireplace is not weatherstripped, windows and doors can seem to have a cold breeze coming through them. This is caused by a condition known as the stack effect. Between the higher and lower pressure zones of the home lies a neutral pressure zone. The neutral pressure zone tends to move toward the largest air leak.  The chimney’s neutral pressure zone is above the neutral pressure zone of the house. This creates a flow of air out the chimney even when no fire is burning. As the large volume of air is drawn up the chimney, warm air from other areas of your house goes up the chimney, too. This robs heat from the other rooms and pulls cold air into the home through cracks around windows and doors that have not been completely sealed.  Sealing the fireplace helps stop the ‘breeze’ coming from your doors and windows.

Energy Codes Require All Openings Be Sealed

Energy Codes in force across North America require that all openings in the building envelope (doors, windows, attic access, etc) be caulked, gasketed, weatherstripped, or otherwise sealed to limit air infiltration and exfiltration. This is because air leakage through cracks can result in higher energy use for home heating and cooling than necessary.

The 2009 International Energy Conservation Code (IECC™) – is the latest version of the Model Energy Codes. All 50 states (as well as our territories) have adopted an Energy Code either the same as or based on the IECC Model Energy Code. The Code specifies that all penetrations in the building envelope between conditioned and unconditioned space that are sources of air leakage must be sealed with durable caulking materials, closed with gasketing systems, weatherstripping or otherwise sealed to limit uncontrolled air movement.

According to the “Plan Check & Field Inspection Guide for 1992 MEC, 1993 MEC, and 1995 MEC”, as well as the “Plan Check & Field Inspection Guide for 1998 IECC and 2000 IECC”, inspectors are instructed to verify that all doors between conditioned and unconditioned spaces have door boots and weatherstripping.

When inspecting for the Residential Provisions of the IECC/MEC, Building Inspectors are taught that proper air sealing will not only decrease the energy use of the building, but it will also increase the comfort of the homeowner and the durability of the home. 

Building Inspectors are also taught that all penetrations in the building envelope between conditioned and unconditioned space must be sealed with durable caulking materials or closed with gasketing materials.

Like a door or window, fireplaces are openings to the outdoors and should be weatherstripped to prevent the loss of heated and/or cooled air.  By weatherstripping the fireplace several benefits are achieved, including improved comfort, energy conservation, reduced energy costs, reduced noise, and improved indoor air quality. 

Mechanical Codes Require Dampers to Be Permanently Blocked Open With Gas Log Sets

In an apparent violation of the Model Energy Codes, there currently exists a requirement in the 2003 International Residential Code (IRC) that the fireplace damper must be permanently blocked open when a vented gas log set is installed. This is intended to sufficiently prevent the spillage of combustion products into the room when the fireplace is used, and to prevent build up of gas should the pilot flame be inadvertently extinguished.

The unintended consequence of blocking the damper open is, of course, significant energy loss when the fireplace is not being used. This requirement is not in agreement with the Model Energy Codes that require all openings to be caulked, gasketed, weatherstripped, or otherwise sealed to limit air infiltration and exfiltration.

An alternative would be to simply instruct the homeowner to open the damper when using the fireplace. Instead of the IRC requirement that encourages energy loss, a reasonable solution would be to require a CO detector to notify the occupants of a build-up of combustion products into the room if the fireplace is used when the damper is accidentally left closed. At least one state (Massachusetts) currently requires homes to be provided with CO detectors7.

The Uniform Mechanical Code (UMC) requires all gas logs be equipped with a safety pilot control. The safety pilot maintains a pilot light and prevents gas flow to the main burner if the pilot is not lit.

Solutions Exist Today To Weatherstrip Fireplaces

There are several devices available today that are used to seal the fireplace. For example, top mounted chimney dampers. These are relatively expensive and have a poor return on investment (ROI). In addition they do not seal the fireplace at the bottom damper, leaving the chimney with all of its odors, toxins, and pollutants exposed to the home. In addition they do not address the wasted energy required to condition the chimney space. 

It is often assumed that glass doors are a solution for sealing leaking dampers. This is not true, as glass doors do not air seal the fireplace opening. They do have decorative benefits, however.

There are other products available at hardware stores, etc. to temporarily seal off the flue and stop air from escaping up the chimney. One type of weatherstripping product is an inflatable plug that you insert into the fireplace beneath the damper. This type of weatherstripping is made of heavy plastic with an attached tube for inflating the device. The tube hangs down into the fireplace to remind you that the stopper is there. It can be removed to use the fireplace, and reinstalled again after. These devices have a very high return on investment (ROI), and can pay for themselves in one mid-winter heating bill.

Conclusions

There are 33,000,000 fireplaces in the U.S. As of March 2005, the total energy cost savings that can be achieved by weatherstripping fireplaces in the U.S. is ,100,000,000, or conservatively about 0 – 0 per fireplace, annually. This incredible amount can be expected to rise to ,400,000,000 annually by the year 2015, or in excess of 0 per fireplace, annually.

There are devices available today to weatherstrip the fireplace that can provide a very high return on investment (ROI), and can pay for themselves in as little as one mid-winter heating bill.

Public awareness through education, training, and other methods are required to alert consumers of the amount of wasted energy from fireplaces, and to provide solutions.

The following action items are urged:

Educate the general public about the enormous cost of energy loss through fireplaces, and of the various ways to seal these openings between uses of the fireplace. Add the requirement to weatherstrip fireplace dampers to the Model Energy Codes.  Allow an alternative to the energy wasteful requirement in the Codes that require the fireplace damper to be blocked open when vented gas logs are installed. As an alternative, the Code should allow the option to not block the fireplace damper in the open position when homes are provided with CO detectors and a safety pilot control.  Conduct further study of energy loss through the fireplace in both heating and cooling climates.

References:

1 Study documented by Joe Pate, Enviro Energy International Inc.

2 Ventilation perturbations due to an open fireplace in a house – P. Dalicieux and C. Nicolas.

3 http://www.ded.mo.gov/researchandplanning/newsletter/electricity. htm

4 http://www.census.gov/population/www/socdemo/hh-fam/cps2004. html

5 http://ducts.lbl. gov

6 http://www.mass.gov/legis/bills/senate/st02/st02037. htm

7 http://www.energy.gov/news/1939. htm

About the author: Mark D. Tyrol is a Professional Engineer specializing in cause and origin of construction defects. He developed several residential energy conservation products including an attic stair cover, and is the U.S. Distributor of the Fireplace Plug. To learn more visit www.batticdoor. com

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Posted by admin on January 15th, 2011 :: Filed under Fireplaces
Tags :: Conserve, Dampers, Energy, Fireplace, Seal, Weatherstripping

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Contemporary fireplaces for the modern home

Nothing says “home” quite like a well made fire place. And with modern decor trends all about making a connection between the old and the new, the best way to make your house into a really warm and inviting home is to look into contemporary fireplaces.

The modern fire place is hand built, bespoke and inspired by the clean lines of modern living. It adds an air of timeless appeal to any lounge or living area – making a work of art from the living flame dancing in the grate. There is a definite link to the past in every design, though – a perfect combination of the clean bright look that defines modern architecture, and the classical fire places that have inspired them. Home owners are thus able to create a uniquely modern look, with Art Deco or even Doric flavours ensuring that the contemporary fireplaces they use become the centrepiece of every room. It is in those centrepieces that the influences that have been called forth for every interior home design should meet: and it is thanks to the subtle blending of these influences, by skilled designers, that the homes blessed with modern fire places are able to create a unique atmosphere.

The great thing about contemporary fireplaces is their versatility. Because a contemporary fire place calls forth both modern and classical forms, it can be equally well suited to pretty much every type and kind of interior theme. Very modern rooms are given a touch of classical elegance thanks to the hints of Art Deco, or Doric columns, alluded to above: while rooms that have a more classical feel, get an up to date tone thanks to the modern lines of the same fire places.

There is nothing like an open fire, or a wood burner, to make your house feel welcoming and warm. Contemporary fireplaces are further suited to the modern home because they are equally suited to hosting or holding a wood burner as they are to having a traditional grate and open fire. Indeed, modern room design can make provision for a fire place that is designed to hold a wood burner rather than a traditional fire. That means that the home can be designed for the warmth and comfort that fire traditionally gives, but with the more compact shape and size of a wood burner in mind. The modern fireplace can be fitted to parts of a room that held an old style hearth – or used as framing devices for wood burners that have been placed in their own original locations.

Contemporary fireplaces are the frames for the living art of the flames. They make a bold statement in a bold room and a soothing statement in a more classically arranged home. With their multi functional appeal and their real bespoke design, they become the perfect centre piece for every room and every life style. Blend the old and the new in style and find your unique individual theme – it’ll last for a whole lifetime.

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Posted by admin on December 30th, 2010 :: Filed under Fireplaces
Tags :: Contemporary, Fireplaces, Home, Modern

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