Fireplaces

Oven chamotte covers all visible surfaces of the combustion chamber, so you do not see metal, which adds aesthetics and durability

For a better view of the fire, the combustion chamber has a trapezoidal shape

Universal, fast and easy solution to change the opening side of the door from left to right

Cleaning is easy. In the fireplace inserts with the lifting doors, the door frame can be tipped to allow you to clean the glass

The air supply control is fully mechanical, without seals. Reliable mechanism that will work for a long time without maintenance.

Deep bottom. The deep bottom of the combustion chamber eliminates the hassle of frequently cleaning your fireplace.

Record-low height.The construction of the firebox allows any design project to be realized thanks to the record-low layout of the mounting frame.

Unique air supply (both side and bottom air supply). Convenient and easy connection of the fireplace to the outside air supply.

The advantage of the extended path of the flue gases provides high efficiency of the device

Uniform heat distribution ensures efficient heating of the upper module.

A solid sheet of metal with a minimum of welds ensures the durability and aesthetics of your fireplace.

U-channel reinforcement of body construction (stiffness is 40% higher than with rib reinforcement).

Reliability and durability of the furnace is provided by a door frame made of solid sheet metal, which adds additional stiffness to the structure.

Development design and production of fireplaces are all under one roof.It helps to maintain our quality, to minimize logistics and cut brokerage costs.

How does it work?

The picture shows us a cross-section of a firebox. Arrows indicate the location of air flows. The cross section of the air supply duct provides the optimum air distribution for primary firing and the clear glass system. From the upper duct, air is fed to self-clean the glass, washing it and forming a protective screen, resulting in self-cleaning (soot and dust that settle on the glass is burned as the temperature rises). The material of which the door is made is fully bent with a special groove under the sealing cord, this design prevents air from penetrating through the cracks and ensures that the furnace is sealed. Clean glass system does not break the tightness of the furnace. Especially these technological solutions help the firebox to work effectively.

70×52 cross-section

Calculation of the furnace power

The power of the heating devices must always be calculated from the room heat loss (actual or calculated). Actual heat losses throughout the day can fluctuate, which can be represented as follows:

Gray: room heat loss

Accordingly to this, a strategy is formed and the necessary equipment is selected to maximally reproduce the heat loss curve by the power generated from the burning of firewood.

Furnaces of air heating are a powerful source of heat and can operate continuously throughout the heating season. The main advantages of such devices are:

• Considerable power that can heat large air volumes in a short time;
• Easy installation, which does not require hydraulics or a stove;
• High reliability and energy independence of the system.

Despite many advantages, the main disadvantage of a simple convective system is its low inertia, which is related to the nature of the combustion and the inability of air fireplaces to store heat. An air fireplace without automatic control of the combustion process will give the heat off as follows:

Gray: room heat loss; red: heat release by air fireplace

At first, there is a rapid firing of firewood, a peak of burning, and then, the same rapid damping, which is prolonged by the heat transfer from coal, which burns for the next several hours. Such heat dissipation does not reproduce the room heat losses very qualitatively, but temperature variations are quite acceptable here, but periodic heating by the fireplace can significantly or even completely solve the heating issue. That is why air fireplaces are the perfect solution for:

• Temporary accommodation, such as vacation homes and holiday homes
• A permanent residence with another main source of heat that equalizes temperature fluctuations

On the technical side, the power of the firebox should be calculated in accordance with the installed system (with or without heat removal ducts) and the heat losses of the premises planned to be heated by the fireplace. Thus, a room with a fireplace will receive the most heat from the fireplace lining and glass.

The power fraction of the furnace emitted through the glass is about 30%. For the fireplaces with glass sizes over 80 cm wide and 60 cm high, this value will increase up to 40-50%. That is, the room heat loss, where the fireplace is located, should be such that heating the fireplace does not create discomfort. For example, if the area of a room is about 35-40 square meters, you can think of the heat loss of about 1-3 kW (this value is statistical and requires separate study in case of installation). From the fraction of furnace power we can see the followings: 3kW / 30% = 10kW rated power. The power of the furnace should not be selected so that its nominal power exceeds that value substantially; at the same time, very low power will not provide enough heat.

It is possible to calculate the amount of heat that will be released during combustion from the number of laid firewood: 1kg of firewood will leave 3.5kW * h of heat. Burning 4kg in 2 hours you can get: 4kg * 3.5kW * h = 14kW * h, 14kW * h / 2h = 7kW.

Long burning mode

During unregulated combustion, the firebox burns too quickly, giving off more heat than the heat exchanger designed for, and also creating uncomfortable temperature fluctuations. To prolong the combustion time in practice we often use the mode of long burning, when due to 2-5% of combustion completeness is achieved a significant increase in the efficiency of heat transfer.  This mode involves reducing the air supply to 1 / 2-1 / 4 from the maximum open flap position after the fireplace has reached intense combustion and the soot from ignition will start to burn out.  In this case, it is possible to prolong the heat output from the fireplace for more than an hour.

WARNING! Long-burning mode is possible and advisable only in the case of high-temperature devices with steel- lined combustion chambers. Low-temperature stone fireboxes will be covered with soot inside if the amount of air is reduced, they will cover the chimney with a thick layer of soot, which can cause a fire.

WARNING!The long burning mode can be used as long as the air supply deficiency will not cause the formation of soot on the walls of the furnace and the glass. In case of its formation, the intensity of combustion should be increased. The use of firebox in smoker-forming modes is prohibited.

The best way to reduce the accidental factor when regulating the air flow for prolonged combustion is to install appropriate fireplaces that regulate the air flow by controlling the temperature in the combustion chamber or the temperature of the flue gas at the outlet from the furnace to the chimney.

Extra glass

Extra glass reduces the radiation through the door by 30% without affecting the fire observation. Due to the double glass in the firebox, high temperature is reached faster for efficient combustion. We recommend you to install a double glass:

1. for large furnaces, or to reduce the risk of overheating of the fireplace room
2. for fireplaces with water circuit and accumulation

Hot air distributor

To get heat from the fireplace into the adjacent rooms, as well as to heat the rooms on the second floor, it is convenient to use a distributor that stores maximum heat for distribution between rooms and does not allow to overheat the room with a fireplace. In addition, the distributor has openings for connecting air ducts.

The distributor is made of stainless steel, 0.5mm thick, which will not change its properties with the years of use.

The design of the rear and side walls will not create any sounds of whack from the expansion of the metal during fireplace work.

Modules

The modules can be installed to extract heat from the flue gases, to increase operating range or to expand functionality:

Quality
Buying Gavryliv & Sons firebox you get a product that is made by the skilled workers and goes through several stages of quality checks. All firebox models are tested on the stand, including stress tests to ensure a high level of safety and trouble-free, happy usage for many years.
Guarantee

By accepting quality as a rule, Gavryliv & Sons accepts product liability, so a five-year warranty applies to all the company’s products.