Connect the stove to the room air independent

Connect the stove to the room air independent: stove

Woodburning stoves not only exude a cozy atmosphere, they also provide heat, thus supporting the heating and thus reducing operating costs. Especially in the transitional period, when the heating system is too expensive to heat just the living space easily, two logs of wood in the stove can cost-effectively provide for a pleasant warming.

Therefore, many homeowners decide for the installation of a fireplace or installation of a stove. The benefits are obvious and a rich offer caters to every taste from antique, rustic to modern with lots of glass and clean lines.

If there is already a chimney of an old heating system, the connection of the furnace does not have to be complicated or expensive. However, it is important to have previously informed by the chimney sweep, if the chimney is suitable and what conditions must be observed.

When is a room air independent chimney necessary?

If you think back a few decades, there was still a coal stove in almost every room that only needed a deduction. Apart from the fire protection, there were only a few conditions. However, today in the age of energy saving and windproof houses, there are a few critical points to consider, the dangers of which are not negligible.

Let's take a closer look at the burning process in an oven, fireplace or stove:

Connect the stove to the room air independent: independent

Draft in a stove or stove

Burning produces heat that is known to flow upwards. This process is used in a chimney, so that the exhaust gases are transported outwards through the chimney with the warm exhaust air. The resulting negative pressure in the furnace is compensated with room air, which simultaneously supplies the fireplace with fresh oxygen. Called this function "chimney effect" and thus finds application in almost every stove or fireplace. It also allows the operation of open fireplaces, without the exhaust gases reach the living room.

Already at this point, modern airtight houses have a problem. If the air is constantly withdrawn from the room, there will be a negative pressure throughout the house which somehow has to be compensated. In a large house, however, it is sufficient if somewhere a window is open or back to the front door is opened.

The situation is different, however, if a ventilation system is available or if the extractor hood in the kitchen blows its exhaust air outside. If the stove and extraction hood or ventilation system are in operation at the same time, there are several places where the room air is extracted and there is a much greater negative pressure, which must be compensated.

True to the motto "the stronger wins", the ventilation system will continue to suck its air unchecked and win against the much weaker chimney effect in the oven. The exhaust gases can no longer be directed through the chimney to the outside, but are sucked inwards into the living space. The deadly dangers are known to everyone.

In order to avoid these dangers, there are room air independent stoves and stoves which receive their fresh air externally. For an open fireplace without closed space, this construction is not possible because the air supply can not be influenced.

Connect the stove to the room air independent: stove

Room air-dependent and room air independent stove

Room-independent ovens do not draw their fresh air from the living space, but have a second air connection to the outside. In such a model, the exhaust gases flow through the chimney, the negative pressure in the furnace is compensated by fresh air from the outside. Air from the room is not needed and therefore can not be influenced by a ventilation system.

If an oven or stove is planned and if a ventilation system or extractor hood with external connection is available, a combustion chamber independent of room air is required by law.

But even without a regulation, such a stove has its advantages. Even during operation, there is no need to ventilate and additionally supply air to the room, which ensures unwanted cooling.

Building instructions: Connect the stove to the room air independent

Material and tool requirements

Connect the stove to the room air independent: room

Required tools for a stove connection.

Required tools for a stove connection.

  • Hand truck for transporting the furnace into the installation room
  • Stove connection set
  • Carpet leftovers or rags
  • spirit level
  • Angle grinder with steel or stainless steel disc
  • Folding rule or steel measure
  • refractory mortar (eg plaster and masonry mortar according to DIN 4102)
  • Trowel, large spatula, smoothness
  • rubber hammer
  • Color or wallpaper for the final optical processing

Tools for making the exhaust vent

Core Drill - allows a very clean and accurate opening
Rotary hammer - takes much longer and requires more physical effort
Hammer and chisel - is required for clean reworking of the opening, suitable only for very light walls for the preparation of the entire opening
Impact Drill - Ceramic pipes in chimney systems are brittle and should not be handled with the hammer or chisel. A hammer drill works with less impact energy and is gentler.

Step 1: Set the height of the chimney connection and measure.

Important: Before you begin to install your stove, talk to your regional chimney sweep, who will later remove the new hearth. He can tell you exactly what to do when connecting the stove. Here are minimum distances of the fireplace to the wall as well as the remaining chimney height above the connection. Only with this information you can connect your stove yourself.

Connect the stove to the room air independent: connect

Attach riser with bow and measure height.

You should also think about how long the riser above the stove should be later, before it disappears in the chimney. Not everyone views the visible stovepipe as beautiful, yet it offers the possibility to use the heat of the exhaust air even better.

Equally important is the floor on which the stove stands. If this consists of parquet, floorboards or other combustible materials, care must be taken to ensure a fireproof surface. Floating surfaces should be left out for this area, so that they continue to have their freedom of movement.

Once all important points have been clarified and the connection height has been determined, this can be transferred to the chimney. To do this, set the length of the riser (shorten if necessary) and place it on the stove with the subsequent elbow (optional with cleaning flap). After it has been properly aligned, measurements can be taken on the stove. Helpful in this case, a cross-line laser or a laser spirit level, with which the measure can be transferred directly to the wall.

Step 2: Drill and prepare the chimney connection

Connect the stove to the room air independent: independent

A core drill ensures exactly round holes.

If not already available, the chimney hole opening must be made in the second step. The advantage here is the use of a core drill. This performs the work very cleanly and without physical exertion. Note that the opening should be at least 2 cm (4 cm in diameter) larger than the stovepipe.

If you do not have a core drill available, the hole must be removed manually. For this purpose - depending on the nature of the wall - a hammer drill or a percussion drill can be used. The required effort is lower in a hammer drill, but there is a risk that the heavy blows may cause material to burst out or even tear the possibly existing ceramic tube inside the chimney completely. Here should be worked very carefully.

To make a round hole with a drill, record the diameter on the wall and put many small holes along the crack. Subsequently, the inner area can be struck with a mortising hammer or by hand with a hammer and chisel.

Step 3: Insert wall lining and seal with refractory mortar

Once the opening has been made, the double wall lining can be used. In order to prevent damage to the lining later on and to be able to expand under thermal stress, wrap it with an insulating mat (ceramic wool, high-temperature fiber) before inserting it and insert it so deep that it is flush with the front. Overlapping wool can be inserted with a pin or a folding rule.

Subsequently, all transitions to the wall must be sealed with refractory mortar. This process is especially important on the inside of the chimney in order to prevent the ingress of moisture. To do this, mix the refractory mortar according to the manufacturer's instructions and press it with your fingers into the gap between the chimney wall and the double wall lining. The outside should also be slightly smeared so that neither the lining nor the insulating mat can slip.

Detailed instructions for inserting the wall lining can be found here: Wall lining for chimney connection

Connect the stove to the room air independent: stove

Close all gaps with refractory mortar.

Connect the stove to the room air independent: independent

Insert wall lining with insulating mat into the opening.

Step 4: Position the stove correctly

Air-independent stoves have another opening underneath, where the external air supply is connected. This can be introduced from a ventilated chimney or through an additional hole in an exterior wall. Check at your stove where the connection is made and, if necessary, remove the corresponding cover.

So that the stove can be easily positioned and the floor is not damaged. Tilt it slightly to one side and place on one side, a carpet rest, a cloth or other soil-preserving materials. The same happens on the other side, so that no more feet touch the ground and the stove can be easily pushed.

Connect the stove to the room air independent: connect

Position the stove with the help of documents.

Connect the stove to the room air independent: connect

If present, remove the cover of the supply air.

Step 5: Accurate alignment is important

Place the stove exactly at its destination. This is important, so that the length of the stovepipe can be determined exactly and all pipes sit well.

You still have the opportunity to vary something, but it is important that the upper pipe bend can be rotated so that it is flush with the wall connection. If necessary, so-called adjustable multi-bows can compensate for a small offset.

Also pay attention to an exactly vertical orientation of the riser. If this is wrong, this will falsify the distance to the wall connection and the dimension will not be removed correctly in the following step.

Connect the stove to the room air independent: room

Pay attention to a vertical alignment of the riser.

Connect the stove to the room air independent: independent

Line up the stove at its destination.

Step 6: Determine the length of the fitting and cut it

Connect the stove to the room air independent: independent

Determine the exact distance.

To determine the length of the connection piece, use a folding rule, which you can insert into the double wall of the wall connection. Now measure the exact distance to the end of the taper on the pipe bend.

Transfer this dimension to the stovepipe and separate it as straight as possible. It is helpful if you mark the measure around. This is made easier if you place the stovepipe vertically, fix a pin in the required height and turn the pipe along the pin.

Connect the stove to the room air independent: connect

Shorten the stovepipe as straight as possible.

Connect the stove to the room air independent: connect

Transfer all around to the stovepipe.

Step 7: Connect the stovepipe and the Fruschluftzufuhr

If the last connector has been cut to size, the stove with independent room ventilation can be connected.

To do this, plug the connection panel onto the stovepipe to cover the wall connection. If the panel is not sufficient, the damage to the wall may need to be repaired with paint or wallpaper. Completely plug in the stove set and recheck the correct seat. Now you can also remove the carpet left underneath the stove.

As a last work, the external air supply is connected by means of an Aluflex tube. Details on this step can be found here: Installing the combustion air line

Connect the stove to the room air independent: connect

Connect external air supply with Aluflex tube.

Connect the stove to the room air independent: stove

Furnace tube branch should cover the connection piece.
Photo Credits:
- Cover picture: © MaxFirePR GbR -
- Draft in the oven: (Verbrennungsluft.jpg) from | edinger Fachmarkt GmbH, License: CC BY-SA 3.0 DE
- Room air dependent - independent stove (original image) by Schornsteinwerk K. -H. Schreyer GmbH, License: CC BY-SA 4.0, Pictures combined, cut and edited
- all other pictures: © MaxFirePR GbR -

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