The draught limiter product range - kutzner-weber.de · Subject Page The company 2–3 Why draught limiters 4–5 The choice of draught limiters 6 The installation situation 7 The

SERVICE-INFORMATION

Kutzner + Weber is certificated according to DIN EN ISO 9001:2000

GENERAL OVERVIEW

The draught limiter product rangeIncreasing the efficiency of combustion heating appliances

8_84_Zugbe_Ges_E 24.08.2007 11:56 Uhr Seite 1

Subject Page

The company 2–3

Why draught limiters 4–5

The choice of draught limiters 6

The installation situation 7

The draught limiter Z150 S 8–9

The precision draught limiters 10

The low-priced draught limiters 11

The large systems 12–13

The stove regulator 14

The flue dampers 15


The current climate of environmental concerns has produced amarket segment where our flue products are relevant both now andin the future. Innovation has been part of our company history formore than 70 years and includes the successful Diermayer damperfor preventing heat losses, systems for locating and solving noiseproblems and devices for optimising combustion processes.

Innovation, Environment, PeopleWe believe in taking a responsible attitude towards the natural envi-ronment while satisfying today's demands for a high level of com-fort. Most of our products help to reduce atmospheric pollution.We are equally committed to bringing quiet and safety into thehome. Our products help to increase the quality of life and well-being in each room by providing a more uniform burn while redu-cing the operating noises.

Development and qualityWhen developing new solutions, Kutzner + Weber has always wor-ked in collaboration with scientists and researchers from establis-hed institutions. We have been operating a franchise arrangementwith the Fraunhofer Institute of Building Physics since 2001. Thehigh quality of our products and the skill and expertise we demandfrom our staff on a daily basis reflect our investment in develop-ment and in the constant search for better solutions using the mostup-to-date technology.

Complete and competentCustomers all over the world are benefiting from our high qualityproducts and solution-oriented service. Kutzner + Weber, a subsidi-ary of the Raab group, produces a full range of flue-gas products inassociation with the manufacturer of stainless-steel flue systems.Thus, we are able to offer you compatible components from a singlesource for both domestic and industrial applications.

Draught limiters and economicsThis brochure contains a complete overview of draught limiterswhich are available from one source. Being based on a simple prin-ciple they are highly effective. Heat output, energy consumptionand emissions are directly related to underpressure in the fluesystem which is generally referred to as draught. This draught issubject to fluctuations due to natural effects but this can be regula-ted by a draught limiter to facilitate smooth, controlled combustion.

3

The company

"Intelligent solutions for optimising chimney systems save energy and

reduce emissions."

Test laboratory for draught limiters and flue-gas dampers.


4

Why draught limiters?

The purposeFlue systems or chimneys are dimensioned according to the com-bustion heating appliances which are connected to them. The effi-ciency of a draught system however is subject to natural fluctua-tions caused by temperature differences according to the time ofyear and the weather. To guarantee reliable operation, the flue systems are designed for an assumed outside temperature of 15°C(according to EN 13384). During the heating periods in which theunits mainly run, unfavourable temperature gradients can lead to ahigh underpressure in the system with the result that the mode ofcombustion ceases to be economic. The efficiency is reduced andthe energy consumption increases. Draught limiters limit theunderpressure to the optimum value for the combustion heatingappliance.

Luftdruck

Air pressureThe air pressure in the earth's atmosphere at anyparticular location is the hydrostatic pressure ofthe air prevailing at that location. This pressure isequal to the weight of the column of air standingon the earth's surface or standing on a body loca-ted on it.The air pressure also acts directly on the draughtin a chimney - the lower the air pressure, the hig-her the draught in a chimney. The air pressure isdetermined by the location (in mountains, forexample, the air pressure is lower than at sealevel) and the time of day, weather effects and timeof year - in summer, the air pressure is higher thanit is in winter. Thus, the difference between the airpressure on a bad day in April and a good day inSeptember can be as much as 90 Pa.

1020

1016

1012

1008

1004

1000

996

992

998

Air p

ress

ure i

n hP

a

Time in months

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

highest monthly averagemonthly averagelowest monthly averageAir pressure over the year, Potsdamm 2006. Most of the time

during the year, the chimney (adjusted to 1010 hPa) is dra-wing too much air (whenever the air pressure falls below1010 hPa)

J L

Summer operation

Winter operation

without draught limiter

Air pressure over the year

Example: At low temperaturesand low air pressure, the draughtin the chimney is too strong. Thisincreases the energy consumption.

Example: The draught in thechimney is at its optimum whenthe temperature is 15°C and theair pressure is high..


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Standard levels of utilisation can be used to calculate the percentage of fuel saved by draught limiters.Example: With a difference of 17 Pa, the level ofutilisation drops by 3.5%

The solutionDraught limiters (also referred to as secondary air devices inGerman Standards Institute DIN 4795) are mechanical or motori-sed components which produce uniform underpressure conditionsin a flue gas system. As soon as the draught in the chimneyexceeds the optimum value, the draught limiter damper opens andlimits the underpressure by supplementing the amount of air supp-lied. On reaching the preset value, the damper closes again. Thismethod, which is both simple and effective, facilitates uniformcombustion and generates measurable energy savings. The moneyinvested in draught limiters is recouped via the reduced fuel con-sumption after only a short time and is a simple way of reducingheating costs, both in the industrial and domestic sector. Anotherargument in favour of draught limiters is the reduction in emis-sions resulting from continuous combustion.

Payback period of draught limiters in relation to fuel con-sumption and average underpressure

85,0

84,0

83,0

82,0

81,0

80,0

79,0

78,0

77,0

76,00 10 20 30 40 50 60 70

9,0

8,0

7,0

6,0

5,0

4,0

3,0

2,0

1,0

0,0

Leve

l of u

tilisa

tion

in %

Fuel

savin

g in

%

Delivery pressure in Pa

84,283,2

82,1

80,7

79,4

76,7

78,1

8,9

7,2

5,7

4,2

2,5

0,8

0,0

8,1

6,5

4,9

3,4

1,7

0,0

-3,5%

17 Pa

10,0

9,0

8,0

7,0

6,0

5,0

4,0

3,0

2,0

1,0

0 500 1000 1500 2000 2500 3000 3500

Time i

n ye

ars

Fuel consumption in euro

20 Pa

30 Pa

40 Pa

50 Pa

20 Pa 50 Pa30 Pa 60 Pa40 Pa

Standard level of utilisation in %Fuel saving at NVL 10 Pa in %Fuel saving at NVL 5 Pa in %

Payback period

Fuel consumption

L J

Winter operation

with draught limiter

Winter operation

without draught limiter

Example: The draught limiterprovides the optimum draught inthe chimney, even when the tem-perature and pressure are low.


6

The choice of draught limiter

Reasons for secondary air devicesModern combustion heating appliances are particularly demandingon the flue system. The specified efficiencies can only be achievedwith a constant underpressure. Secondary air devices which com-ply with the standard enable chimneys to be adjusted to the com-bustion heating appliance, regardless of the mode of operation.They optimise the energy balance and the emissions from your heating system.

The objectives which are expected to be achieved by installing a secondary air device are as follows:

• Compensation for increased underpressures caused bythe weather.

• Reduction in dew point and resulting condensate formation.

Technical rulesSecondary air devices (draught limiters) are permitted for combus-tion heating appliances, connection pieces or chimneys providingthe following conditions according to DIN 18160-1 (2001) are guaranteed:

• the complete discharge of flue gases is not impaired.

• dangerous quantities of flue gas cannot escape if backed up orsubjected to a back draught.

• the testing and cleaning of the flue system is not impaired.

100

12

150

200

300

400

500

600

800

1000

1500

2000

3000

4000

35

30

25

20

15

10

8

6

5

4

Cross sectional area in cm2

Diameter in cm

Group Air output m3/hDIN 4795 ∆p 5 20 40 Pa

ZUK 250 (SG) 6 220 380 525ZUK 180 5 190 275 360ZUK 150 4 140 220 300ZUK 130 3 75 130 160

14 16 18 20 22,5

25 30 35 40 45 50 60 70

SG

SG

SG

SG

Layout according to the standard for Pattern I chimneys(multi shell) and Pattern IIa (at least two shells)

Example:Chimney height 10 m, chimney diameter 25 cm · Pattern I (multishell)Read off at the chimney height and at 25 cm coloured lines. Z 150, Z 180 and ZUK 250 (SG) are suitable. Z 150 or Z 180 are preferred.

Model up to max. chimney - in combination with approximately kW height in m the cross section in mm

Z100 25 8 125012 45 9 15005 75 14 200Z(UK) 130 45 8 150Z(UK) 150 75 10 150Z(UK) 150 S 75 10 180Z(UK) 180 100 12 200ZUK 250 299 19 250*ZUK 250 SG from 300 from 20 250*

* with larger cross sections, several draught limiters if necessary

Choice of model based on our experiences

Chim

ney

heig

ht in

m


at least 0.40 m above the base of the chimney (solid-fuel systems)

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The installation situation

Recommendations for secondary air devicesSecondary air devices are usually only allowed to be installed in theroom where the combustion heating appliance is set up or inrooms next to the room with the combustion heating appliancesharing the same combustion-air connection. In multiple fluesystems, the secondary air devices may only be installed when allcombustion heating appliances are set up in the same room.

The arrangement of secondary air devices in the room where thecombustion heating appliances are set up is specified (same pres-sure conditions for combustion heating appliances and secondaryair devices) for operational and fire-protection reasons. This requi-rement is mandatory except for gas combustion heating applianceswith firing devices which have burners without blower and a ratedheat output of no more than 30 kW to a common chimney.

When choosing the position for installation, it is essential to makesure that draught limiters are located in the area of the "zero point"of the flue system. When the combustion heating appliance is usedcorrectly, no overpressure is permissable. The connection pieceshould always be placed after (downstream of) silencer or bends ifpresent.

If the draught limiter is installed in a room which is generallyaccessible, then an additional cover grid should be installed in frontto prevent unauthorised access to the setting weights. In the verti-cal part of the flue system, secondary air devices must be positio-ned 40 cm above the base when combustion heating appliances forsolid fuels are connected to the flue system. With solid-fuels,installation in the connection duct is permitted according toDIN 18160-1.

Draught limiters on shared chimneysUnder exceptional circumstances, with the agreement of the districtmaster chimney sweep, only one draught limiter may be installedto prevent high flue-gas losses and for ventilation (e.g. in the base-ment) in chimneys to which several gas combustion heating appli-ances with burners without forced draught are connected. This ispermissible provided that approximately the same pressure ratiosexist between the room where the gas combustion heating applian-ces are installed and the installation position of the draught limiter.This can largely be assumed when the rooms are facing the windon the same side and have comparable air supplies. In each case,rooms with ventilation systems (e.g. dryers) and staircases areunsuitable locations for installing draught limiters.

Installation Position �: excellent regulation, ventilation effect limited by long flue pipe orsmall flue pipe cross section Q1 in relation to the chimney cross section Q2.

Installation Position � + �: excellent ventilation effect, good regulation, retrofit installati-on at Installation Position 3 possible only with masonry chimneys. With multi-shell designs, canonly be installed by specialist companies.

Installation Position �: regulation and ventilation limited. Because the amount of soot whichaccumulates is small, installation at this position is recommended for solid-fuel boilers and linedchimneys.

Boilers

Boilers

Boilers

KW draught limiter

KW draught limiter

KW draught limiter

QQ1

QQ2

The draught limiter also operates in thechimney. The lower installation position isadvisable for solid-fuels because the amountof soot which accumulates there is smaller.

�

�

�

�

Draught limiter placed near the boiler isthe most effective.


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Prof. Dr. Ing. Rawe on the function of the draught limiterAmong other things, automatic secondary air devices (draughtlimiters) also improve the combustion efficiency of combustionheating appliances. They prevent malfunctions which frequentlyoccur due to weather or pressure conditions. Prof. Dr. Ing.Rudolf Rawe from Gelsenkirchen University of Applied Sciencescame to this conclusion after detailed investigations.

The mechanically operated devices, which are tested in accordan-ce with DIN 4795, open the flue system according to the pressuredifference in the chimney. The lift or draw (chimney draught) iskept constant by the stream of secondary air which is controlledby this means, regardless of the effects of the weather, and isoptimised for the combustion process. Draught limiters thereforestabilise the pressure conditions in the flue line and significantlyincrease the operational reliability and efficiency of the system.

According to Prof. Dr. Ing. Rawe, in practice, the underpressureat the boiler flue connector is often 5-10 Pa higher than thedraught requirement specified by the manufacturer. This has adetrimental effect on the combustion process and leads to poorfuel utilisation. The potential energy savings are between threeand nine percent, depending on the actual pressure difference.Thus, the money invested in a draught limiter which has beentested according to the standards is usually recouped within oneor two heating periods.

Mode of operation of draught limitersIn order to operate, combustion heating appliances such as oil orpellet boilers require a certain constant underpressure at the flueconnector. If this underpressure increases, then the correspon-ding efficiency or level of utilisation decreases and the fuel con-sumption increases. Draught limiters decrease this increasedunderpressure and facilitate a smoother burn.

Adjusting the draught limiterIn order for the combustion heating appliance to operate underoptimum conditions and achieve the maximum effect for dryingthe chimney, the draught limiter must be adjusted to the "mini-mum draught requirement" for the combustion heating applianceaccording to the specifications in the installation instructions.This is stated on the serial plate or in the installation instructions.In the case of systems with gas combustion heating applianceswhich have burners without forced draught or low output boilers,a draught requirement of 10 Pa is generally sufficient.

The KW draught limiter

After installing a draught limiter

� smoother burn

� lower emissions

� lower fuel consumption

"Draught limiters stabilise the pressureconditions in the flue line and thereforeincrease the efficiency of your burner."


New generation draught limitersNew standards set by draught limiter Z 150 S. A sprayed-onEPDM seal prevents the regulator plate from rattling and fly ashescaping. The seal is heat and condensate resistant and the spe-cially stabilised regulator plate guarantees high regulation accu-racy since it is supported by a blade bearing. During shutdownperiods, the regulator plate can be held shut (lockable accordingto the (EnEV) German Energy Saving Act) or held open by themotor controller (which can be retrofitted) according to require-ment. Draught limiter Z 150 S can therefore be used as a combi-ned secondary air device.

Setting weight made frombrass, can be adjusted to the

required underpressure.

Blade bearings guarantee high regulation accuracy

and are self-cleaning.

EPDM seal means that the draught isregulated quietly and without leaks.It is heat and condensate resistant. With pellet boilers, it prevents theescape of dust.

Overpressure damper minimisesthe pressure surge on the fluesystem caused by the burnersigniting.

•

Locking screw for fixing theregulator plate.•

Regulator plate speciallystabilised.•

The entire housing is madefrom durable stainless steel.

•

ht limiter

mption

Applications

� complies with Air Group IV according to DIN 4795

� Motor controller can be retrofitted

� adjustment range from 10 to 35 Pa

� can be locked during shutdown periods (EnEV)

� can also be used as a combined secondary air device

Motor controller (mounted left), closesthe regulator plate during combustionheating appliance shutdown times andtherefore prevents unwanted coolingof the room where the appliance isinstalled.

9

•

•

•

Z 150 S

Motor controller (mounted right),opens the regulator plate during stopsso the chimney is ventilated and therefore acts as a starting aid for the burner.


10

For maximum accuracy and safetyThese draught limiters are characterised by maximum regulationaccuracy and manufacturing precision. Because they are madeexclusively from stainless steel and high-grade brass and usesophisticated solutions such as the cushioned damper, these dam-pers operate extremely quietly and reliably. Models Z130, Z180 andZ 150 S can be extended or retrofitted with motor controllers sothat the chimney can be ventilated during shutdown periods. Unlike the basic models, these draught limiters are also availablewith overpressure dampers. This safety device protects against undesirable pressure surges such as those produced when starting the boiler.

The precision draught limiters

Precision draught limiter seriesUNIVERSAL Z 130, ZUK 130, Z 180and ZUK 180 Draught limiters with motorcontroller (can be retrofitted) for combinedsecondary air device. Regulator plate andhousing entirely made from stainless steel,setting weights brass, external self-cleaningbearing, with locking facility in the closedposition, for chimney installation with KWpipe packing or flue-pipe assembly with theKW connecting piece. Series ZUK with per-manently fixed overpressure damper.

Z 130/Z 180

Z 150/ZUK 150

Precision draught limiterseries STANDARD Z 150 andZUK 150 Draught limiters entirelymade from stainless steel, also available with the KW pipe packingand flue pipe assembly with the KWconnection piece for chimney installation.

KW motor controller Accessory KW motor controller for combined secon-dary air device (can also be retrofitted). Actuator including motor mounting 230V with reset spring, limit switch, integrated circuit breaker, setting lever formanual operation and locking device. Series M 130/180 S1 KS, M 150 S1 KSfor chimney ventilation while the combustion heating appliance has stopped,with 4 m connection cable and plug and socket connector, suitable for fan-assisted burners with euro standard plug. Series M 130/180 S1 and M 250without connection cable (supplied by client). M 150 S1 KS Closer for closingthe draught limiter when the burner has stopped.

Accessories


The best basis for optimising the combustion heating applianceThe basic models concentrate entirely on optimising the flue systemand facilitating uniform combustion. This reduces energy lossesand emissions. By using stainless steel or aluminised steel and asimple mechanism without cushioned dampers, these models areattractively priced and fulfil their basic function without limitation.However, they must do without the overpressure damper as a safety device against pressure peaks.

012 Automatic secondary air device fordirect mounting on the connecting piece(flue pipe). High sensitivity due to bladebearings. Air group 1-4 according to DIN4795. Code letter E - stainless steel ver-sion.

012 RaRo or 012 RaRo E Automaticsecondary air device with connection pieceand retaining strap for mounting on the fluepipe. Round version Ø 150 mm. Suitablefor all pipes from 100-180 mm by usingcover segments. Can also be used on inclined and vertical pipes.

012 MU Self-actuating secondary airdevice with wall packing for mounting inthe chimney wall of the building.

Draught limiter 05

The low-priced draught limiters

Z 100, ZA 100 Draught limiters made entirely fromstainless steel, ZA 100/100 or ZA 100/110 versions inclu-ding connection piece suitable for mounting on flue pipesof nominal diameters 100 or 110 mm.

Draught limiters 05 or 05-E Draught limitermade from aluminised steel (05) or from stainlesssteel (05-E) suitable for installation in the chimneywall of the building. Air Group IV according to DIN4795.

05 Installation also possible directly in cleaning lock14 x 20 (Type RV 05 ZA).

11

Draught limiter 012/012 RaRo/012 RaRo E

Z100


Cost effectivenessArguments relating to cost are particularly important with industrialapplications. The decision to install a draught limiter is thereforequickly made. Even small savings in terms of percentage efficiencycan result in the procurement costs being recouped after one year.After this, real savings can be made which may be considerable,depending on the system. Regulating the flue-gas underpressure bymeans of a draught limiter also results in smooth combustion andthe reduced soot deposits can also reduce the maintenance require-ments to just once a year.

SafetyAnother and often undervalued argument is safety. A phenomenonknown as the Jukowsky pressure surge can occur which is causedby suddenly switching off the burners. This can generate briefunderpressure forces which are high enough to damage the chim-ney so that it can no longer be used.

A system which has been fitted with draught limiters of the correctsize is unaffected by this phenomenon since they are designed toprovide immediate pressure compensation.

System optimisationThe combustion heating appliance and chimney together form acoordinated system. In this case, the purpose of the flue systemproviding the chimney draught is to ensure that the flue gases aresafety removed under all operating conditions. According to thestandard for dimensioning flue systems, this is guaranteed when itcan be shown that the underpressure required for the combustionheating appliance is present for an outside temperature of 15°C.Temperature gradients due to seasons or fluctuations in the weat-her increase the draught and reduce the efficiency of the combusti-on heating appliance linearly but the operating costs increase pro-portionally due to the increased fuel consumption. In a flue systemwith draught limiters, these fluctuations are compensated for andthe conditions are created to produce a constant underpressure.

PlanningAs every conscientious planner knows, it is expensive to obtainhigh efficiency and it easily drops off again when the underpressureis too high. To exploit the efficiency of modern combustion heatingappliances effectively, we always recommend installing a draughtlimiter. Since this is an energy-saving device, the procurementcosts are recouped automatically and the whole system can be runwith an eye on the cost. A flue system can only meet the require-ments of a combustion heating appliance when a draught limiter isfitted to compensate for the detrimental effects of weather-relatedpressure fluctuations.

The large systems

12

"Draught limiters really complete your flue system, and

save you money!"

In this example, the required Group 6secondary air device according to DIN4795 (draught limiter) was not fitted forreasons of cost.

In this case, there was a so-called "JUKOWSKY pressure surge" whichdistorted parts of the flue system to suchan extent that it had to be replaced at substantial cost.

After this damage, the draught limiter ZUK250 SG from Kutzner + Weber which wasrecommended in the preliminary plans wasinstalled. Since then, the heating unit (2.3MW) has been running smoothly and con-sistently.

The positive "secondary effect" is the energy savingwhich paid for the draught limiter within a short period.


Overpressuredamper

Housing made fromdurable stainless steel

Setting weight made from brass,adjustment range 10-50 Pa

Cushioning damperCushioning damper

Locking screw

Cross bar for stabilisation

Motor controller for use as combi-ned secondary air device (can beretrofitted)

Installationhandle

CNC-milled aluminium axle bearing

Robust connectionflange

Stainless steelshaft

Guard for regulatorplate with edgeprotection

1-4 mm material thickness

This test was based on unfavourable conditions and the result varies according to thetype of system, the weather and the time of year. Significantly more impressiveresults can be achieved with various large systems. Feel free to call us about thissubject or contact a specialist who you can trust.

ExampleIn a real test comparison between two identical 1.5 MW boilerplants equipped with modulating gas burner, 500 mm nominal dia-meter flue system and 11 m effective chimney height, the efficiencywas found to increase from 88% to 89%. Even with an efficiencyincrease of just 1% with the price of gas at 0.30 euro/m3, the follo-wing savings were made:

Annual savings: 486,00 EuroInvestment costs: 650,00 Euro

Payback period: 15 month

With a service life of 15 years,the total amount saved overthe working life ofthe draught limiter: 6.640,00 Euro

13

Technology

� complies with Air Group IV according to DIN 4795

� motor controller can be retrofitted

� adjustment range from 10 to 50 Pa

� locking option during shutdown periods, thus no room cooling (EnEV)

� can also be used as a combined secondary air device

Quiet operation - hydraulic damper device to compensate for pressuresurges

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The stove regulator will provide yourwood fire with the best conditions for efficient and emission-free combustion.

Energy should develop its potentialWood fires are very sophisticated and worth making the effort for,burn naturally and can produce any level of heat. Different phasesof the heating process demand flexible combustion heating appli-ances. A wood fire needs different conditions for heating up,burning and when the embers die down in order to make optimumuse of the energy stored. This is the task of the stove regulator.It creates the conditions required by the fire to generate the maxi-mum quantity of energy with the minimum consumption of fuel.This is also good news for our environment since the emissionsfrom a fire which is regulated in this way are considerably lowerthan from a fire which is not.

About the differenceKutzner + Weber prefers to regulate rather than control a fire - thedifference is enormous. This provides the fire with the ideal con-ditions for each phase of the combustion. While a controller usesthe existing knowledge about a wood fire in order to control it, theregulator monitors the combustion and compares the result withthe target value. It takes into account whether the windows areopen, whether the extractor hood is running or whether otherparameters are having a negative effect and then responds accor-dingly. The difference between control and regulation is like thedifference between a monologue and a dialogue - the stove con-troller understands the stove!

The stove regulator

"The difference between controland regulation is substantial"

14

Sensors, control elements and monitoring unit with display. The stove regulatorcollects various pieces of information according to the scope of your installati-ons in order to make the right decisions for your stove.


The flue dampers

Thermally controlled flue damperfor gas-fired appliances The versionwith two dampers moved by bimetallicstrips is suitable for wall-mounted andstandard units.

Thermally controlled flue damperfor gas-fired appliances The versionwith bimetallic blades is suitable forsmall and special units.

Saving energy by preventing heat lossesFlue dampers prevent energy losses from atmospheric combustiondevices. These heat generators allow a stream of air to pass bet-ween the room and the chimney, depending on the type of construc-tion. When the burner is not running, energy losses are produced by the chimney draught which draws the heated room air to the outside. Flue dampers seal off the chimney when it is no longerrequired. The damper opens and closes automatically via bimetallicstrips or a motor controller. We will calculate and recommend theoptimum solution for the type and size of system. While savingenergy, the operating costs decrease as well as the emissions.

Flue dampers as a back flow preventerConnecting several units to a common overpressure system alwaysinvolves the risk of flue gases flowing back to any combustion heating appliances which are not in operation. The solution for increasing operational safety in this case is to install apressure-tight damper.

Motor-actuated flue dampers for gas, oil and solid-fuel-fired appliances The motorised controller can beused for temperature compensation according to the situa-tion. These flue dampers are highly versatile.

"Flue dampers are effective forpreventing energy

losses from atmospheric combustion devices."

Flue dampers for large systems Motor-actuated dampers for large systems up to one-metre diameter. Suitable for gas- and oil-fired plants as well as solid-fuel operationon underpressure flue systems.

15


Kutzner + Weber GmbH

Frauenstrasse 32

D-82216 Maisach

Tel.: +49 (0) 81 41 / 9 57-0

Fax: +49 (0) 81 41 / 9 57-5 00

www.kutzner-weber.de

[email protected]


Documents

The draught limiter product range - kutzner-weber.de · Subject Page The company 2–3 Why draught limiters 4–5 The choice of draught limiters 6 The installation situation 7 The