The flue damper product range - Kutzner+Weber: Home flue damper product range ... Legend TL: Temperature air Tu: ... led between the stove and chimney, sealing off the route to the

SERVICE-INFORMATION

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

GENERAL OVERVIEW

The flue damper product rangeIntelligent solutions for flue and heating technology

8_85_Abgaskl_Ges_E 24.08.2007 15:12 Uhr Seite 1

Subject Page

The company 3

The energy saved with flue damperss 4–5

The thermal and motorised flue dampers 6–7

The choice of flue damper 8

The performance testing and installation situation 9

The thermal flue dampers 10–11

The motorised flue dampers 12–13

The stove regulators 14

The draught limiters 15


3

The company

The current climate of environmental concerns has produced amarket segment where our flue products are relevant both now and in the future. Innovation has been part of our companyhistory for more than 70 years and includes the successfulDiermayer damper for preventing heat losses, systems for locating and solving noise problems and devices for optimisingcombustion processes.

Innovation, Environment, PeopleThese products are born out of a desire to take a responsible attitude towards the natural environment while satisfying the highdemands for the comfort of modern times. Most of our productshelp to reduce atmospheric pollution. We are equally committedto bringing quiet and safety into the home. Our products help toincrease the quality of life and wellbeing in each room by provi-ding a more uniform burn while reducing the operating noises.

Development and qualityWhen developing new solutions, Kutzner + Weber has alwaysworked in collaboration with scientists and researchers from established institutions. We have been operating under a licence agreement with the Fraunhofer Institute of Building Physics since2001. The high quality of our products and the skill and expertisewe demand from our staff on a daily basis reflect our investmentin development and in the constant search for better solutionsusing the most up-to-date technology.

Complete and qualifiedCustomers all over the world are benefiting from our high qualityproducts and solution-oriented service. Kutzner + Weber, a subsidiary of the Raab group, produces a full range of flue-gas products in association with the manufacturer of stainless-steelflue systems. Thus, we are able to offer you compatible compo-nents from a single source for both domestic and industrial applications.

Flue dampers and economicsThis brochure contains a complete overview of flue damperswhich are available from one source. These also include theDiermayer damper on which the success of Kutzner + Weber is based. This non-hinged flue damper which is controlled by abimetallic strip was patented by Mr. Diermayer 1934 and manu-factured by Kutzner + Weber. Flue dampers prevent escaping hea-ted compartment air via the atmospheric combustion device. Theenergy loss this causes is avoided and the fuel consumption andemissions are reduced.

"We help you to save energy and reduce emissions."


4

The energy saved with fluedampers

TL

Tsoil

Legend

TL: Temperature air

Tu: Temperature lowest

To: Temperature highest

Tsoil: Temperature soil

Energy losses from atmospheric combustion appliancesDepending on the design, energy is lost from atmospheric com-bustion heating appliances while the heating appliance is not wor-king. With these systems, the heated room air can escape via thechimney to the outside more or less unhindered, taking the ener-gy stored in the stove with it. Until now, this process has beenoften accepted as an unavoidable loss. However, the EnergyConservation Act (EnEV) has now made it necessary to controlthis loss. The EnEV takes into account the energy savings whichare technically feasible in heating systems for heat conservation.If the combustion appliance is operating in a room which is her-metically shielded to the house, avoiding these losses is countedas a heat or energy gain to the building envelope.

Saving energy with flue dampersDepending on the combustion heating appliance and the outsideconditions, the loss of energy due to room air spillage via thechimney to the outside can amount to more than 4000 kWh peryear. This loss can be avoided with flue dampers. They are instal-led between the stove and chimney, sealing off the route to thechimney as soon as the stove is switched off. The damper is ope-rated either by a bimetal mechanism or by an actuator. The costsof the installation can be quickly recouped by the energy and fuelsavings produced. The payback periods which are calculatedaccording to the flue damper, location and chimney diameter areshown in the tables below.

4,0

3,0

2,0

1,0

0,000,1 0,12 0,14 0,16

Capi

tal p

ayba

ck p

erio

ds in

year

s

Diameter in m

Regensburg 1.9 m/s; cp=0.55Würzburg 3.2 m/s; cp=0.75Bremerhaven 5.2 m/s; cp=0.77

Capital payback periods

The "Capital payback periods" chart shows the times taken for the cost of installing a thermal flue damper to be recouped by the savings achieved by installing it. The potential savings depend on the prevailing weather conditions which, in this case, have been taken into consideration according to the location.


5

The purpose of saving energyThe energy lost from buildings by room air escaping through com-bustion heating appliances and flue systems has been calculatedas part of a study (recognised by experts in the field) which wascarried out by Professor Dr. Ing. Rawe, Gelsenkirchen Universityof Applied Sciences. The results show clearly the benefits of fluedampers.

The fact that energy savings can be proved makes it possible totake them into consideration when calculating the energy balanceof your property. The energy consultant can take flue dampers intoaccount or suggest them as a means of energy conservation. Theyare one means of minimising energy consumption and their con-sequent emissions.

To

Tu

Escaped-air losses through the flue system

Calculation of the annual ventilation losses from special gas-fired boilersInputs/assumptions connection piece

Stainless steel, aluminium, plastic 0,001Refractory-clay shaped bricks 0,002Masonry flues 0,005

Sample calculation

Total losses: 3954,16 kWh/year

Assumptions Inputs zeta values:

Flat length: 1 m Flow preventer 3,0Effective height: 0,3 m Bend and SS inlet 1,5

Input chimney specifications

Chimney height: 10 mChimney diameter: 0,2 mChimney roughness: 0,002 m

Pipe-friction coefficient: 0,048

Load step Average air temperature Average chimney in the chimney outlet temperature

13 % 24° C 22° C30 % 25° C 23° C39 % 26° C 24° C48 % 27° C 25° C63 % 28° C 26° C

Input wind data Inputs, supplied-air data

Average wind speed 5,2 m/s Total joint length 40 mFlow condition (cp-value) 0,77 Joint passage coefficient a 0,6

Load step 13 % 30 % 39 % 48 % 63 %

Average air density 1,187 1,183 1,179 1,175 1,172in the chimney

Underpressure due to 6,2 9,3 11,2 13,1 16,2lift or draw in Pa

Underpressure due to 13,0 13,3 13,4 13,6 13,9wind flow in Pa

Total underpressure in Pa 19,2 22,6 24,6 26,7 30,0

Flow rate in m3/h 140 148 152 156,5 163Ventilation losses in kW 0,590 0,959 1,182 1,429 1,825Ventilation losses in kWh 1477,71 810,52 685,68 578,76 401,49


6

The first flue damper was patented by Mr. Diermayer in 1934 andthen manufactured and marketed by Kutzner + Weber. Diermayerthermal dampers were the first flue dampers but it was not until1973 that the application range was extended with a motor-actua-ted version.

Thermal flue dampersThese are largely maintenance-free and operate fully automatical-ly, while being regularly checked by the chimney sweep.Exploiting their close proximity to the heating appliance - thedampers, which are mounted on non-hinged bearings, open via abimetal mechanism as soon as they are hit by a hot current of air.The special bearing means that the dampers require no mainten-ance and operate reliably over many years. Thermal flue dampersare used with atmospheric gas-fired appliances because they ope-rate automatically without auxiliary energy.

The thermal and motorised flue dampers

"Flue dampers prevent unne-cessary energy losses."

Thermal flue damperThis attractive and simple design is used exclusively with gas-firedappliances.

Without flue damperThe warm room air isdrawn through the stoveand flow preventerthrough the chimney.While this is happening,the energy stored in the stove also escapes by the cooling effect of the air.

With flue damperThe draw from thechimney is stopped, no warm air is extractedfrom the room and thestove can radiate theremaining heat which is stored in it into theroom.

In operation As soonas the burner switcheson, the flue damperopens and the drawfrom the chimney isreinstated.


7

The applications Motorised Thermal flue damper flue damper

Atmospheric gas-fired appliances

Freestanding boilers and wall-mounted appliances

Boilers with forced-draught burner

Solid-fuel heating appliances

Biomass boilers

Tiled stoves, woodburning stoves and open fires

Gas single stoves

Gas cooking hobs with gaspipe

Combustion air ducts for combustion heating appliances

Stoves on air-flue-gas systems

Motorised flue dampersThese also seal the flue path to the chimney but can be operatedindependently of the flue-gas temperature, installation positionand location. This energy conservation is possible for almost allapplications in the private and industrial sectors. It can be usedwith all kinds of fuel and, with cascade installations (several hea-ting appliances connected to one chimney) can prevent the flowof dangerous flue gases into the room. By using different materi-als and motor designs, almost all applications can be covered,e.g. in the form of a bypass damper for a heat exchanger or asupply-air damper.

The motorised version can be actuated in different ways, e.g.manual control via a power switch, temperature-dependent con-trol via an upstream thermostat or automatic control via a stoveregulator (see also Page 14). With solid-fuel heating appliances,the motorised flue damper can be used to control the quality ofthe combustion according to the application - with solid fuels,these can be used selectively to make the combustion more efficient.

Motor-actuated flue dampers These are suita-ble for all kinds of fuel and, because they are temperature dependent, can effectively control the quality of combustion.

MOK flue dampersFor appliances withpilot light and solid-fuel heating appliances.For installing after(downstream of) theflow preventer.

MOK... AD fluedampersFor appliances withpilot light and withoutcondensation deposits.Metallic tight-closingfor underpressure fluesystems. For installingbefore (upstream of) theflow preventer.

MUK flue dampersFor appliances withoutpilot light in wet anddry operation with con-densate deposits orcascade systems.Metallic tight-closingfor overpressure andunderpressure fluesystems. For installingbetween the chimneyand the combustionheating appliance.


The choice of flue damper

Application optionsFlue dampers must be chosen according to the application and thecombustion heating appliance. Thermally activated flue dampers areoften preferred for atmospheric gas-fired appliances. Motorised fluedampers can also be used with oil-fired appliances with forced-draught burners. When used in combination with a stove regulator(see Page 14), motorised flue dampers affect the quality of combus-tion of wood-burning appliances. The quantity of combustion airsupplied can be optimised by recording the conditions of combustionin relation to the phase of combustion. With cascade systems, theundesirable escape of flue gases can be avoided. When several hea-ting appliances are connected to a flue system, the flue paths of allthe combustion heating appliances which are not in operation aresealed off. Extract from the technical regulations for flue dampersWith type B1 and B2 gas-fired appliances, flue dampers may beinstalled in the connection pieces. Compliance with the standard ismandatory: DIN 3388 Part 4 applies to thermally actuated flue dam-

pers and DIN 3388 Part 2 applies to mechanically actuated fluedampers which must be approved and bear the CE symbol. All fluedampers must be installed according to the manufacturer's instructions which will indicate whether the model concerned isdesigned to be used on a certain appliance.

With Type B1 gas-fired appliances, thermally-controlled flue dam-pers may only be installed after (downstream of) the flow preventer.In order to improve the effectiveness of shared flue systems, theyshould preferably be fitted to the lower gas-fired appliance. Tight-closing flue dampers according to DIN 3388 Part 2 are only permitted for type B2 gas-fired appliances. In order to improve the pressure conditions of shared flue systems, the flow resistance ofan existing flue damper may be taken into consideration for theoperating condition "not in operation" according to EN 13384-1,provided that the flue damper complies with DIN 3388-2 or DIN3388-4 and that the damper is also guaranteed to close when thereis a pressure difference of 3 Pa after no more than 3 minutes.

8

Thermally controlled Diermayer dampersfor type B1 gas-fired appliances

Type: GWR

Instantaneousgas-fired boiler

Type: HOS

Type: HOK

Type: HKS

Gas-fired space heater

Motor-actuated Diermayer dampers for gas- and oil-fired appliances

Type: MOK

Type: MOK...AD

Type: MUK

Gas-fired storeyheating boilerwith integratedflow preventer

Gas-fired central heating boiler with flowpreventer attached

*1.)

Gas-firedcombi-boiler

*2.)

Direct gas-firedstorage boiler

Central heatingboiler with forced-draughtburner (oil orgas)

Cascade

Type: GWR NW: 90/110/130

NW: 60–110

Type: HOS NW: 60–100

Type: HOK NW: 90–150

Type: MOK NW: 80-600with minimum opening

Type: MOK...ADNW: 80-600 with metallictight-closing shut-off plate

Type: MUK

*5.)*5.)

Type: HKS

*3.) *4.)

*2.)

NW: 80-300 metallic tight-closing, condensate-resistant, for overpressureand underpressure flue systems

*2.)

*1.) When installed before(upstream of) the flowpreventer, follow the special instructions of theequipment manufacturers.2.) For overpressure fluesystems, (calorific value)for appliances accordingto DVGW-G635 onrequest.3.) For combustion hea-ting appliances with elec-trically controlled fuelsupply only.4.) With damp-insensitiveflue systems or togetherwith a KW draught limiteronly.5.) For suitable combusti-on heating appliancesaccording to the manufac-turers' specifications.


9

The performance testing and installation situation

Performance testing the flue systemAfter installing the flue damper in the gas-fired appliance, a perfor-mance test must be carried out on the entire flue system accordingto Section 8.3 of the Technical Regulations for Gas Installations(TRGI'86) Edition 96. On each gas-fired appliance, with the win-dows and doors of the dwelling closed, no flue gas must be foundto escape at the flow preventer five minutes after starting. Withseveral combustion heating appliances installed in the same dwel-ling, this test must be carried out while all the gas-fired appliancesare in operation, both with the internal doors closed and open. Thetest must be carried out with the highest thermal output possiblefor the gas-fired appliances and, with the gas-fired appliances to betested, with the smallest thermal output also. With gas-fired appli-ances which have a flue-gas monitoring system, the performance ofthis device must also be tested according to the manufacturers'instructions. If flue gas is found to escape during the tests, thenperfect operation is not guaranteed. This fault must be eliminatedimmediately. See the following for possible causes ...

Flue systemChimney draw after the flow preventer less than 3 Pa; effectivechimney height too small; chimney mouth not above roofridge;chimney cross sectional area incorrect; flue pipe too long; too manychanges in direction; incline too small; incorrect connection; insuffi-cient supply of combustion air (joint-tight windows or locked venti-lation openings).

Gas-fired applianceFlue gas temperature too low where the flue-gas damper is instal-led; short operating periods (frequent switching on and off); com-bustion chamber and/or burner nozzles contaminated with greasyvapours (kitchen); increased dust (washing machine or tumbledryer); excessive use of spray.

Flue damperWrong flue damper; incorrect installation; blocked movement of thecontrol and/or shut-off elements; dirty bimetallic strip.

Diameter remains the same, since additional thermalload is less than 25%

Down and up permanently marked

Only applies to a chimney connection for space heaters up to 3.5 kW

Up to three combustion heating appliances permit-ted on chimney with flues from different appliances

Gas-fired appliance max. 30 kW

Solid-fuel heating appliance max. 20 kW

Instantaneous boilers with locking system and common connection piece are considered as onecombustion heating appliance

With more than five full floors or forced-draughtburners, each combustion heating appliance usuallyhas its own chimney

Flue damper

W – effective height of chimneyA – distance between lowest and highest combustion

heating appliance V – effective height of the connecting piece

Comments:Chimney 1 connected to one flue pipe according to EN 13384Chimney 2 connected to several flue pipes Shared Chimney 3 connected to flue pipes from chimneydifferent appliances according

to EN 13384

Exemption see TRGI1986, Edition 96, Sections 6.2.1 and 6.2.2

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Flue damper

Flue damper

Vertical starting distance at least 1 m

21 3

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The thermal flue dampers

Thermal flue damper operationThermal flue dampers are used exclusively with atmosphericgas-fired heating appliances. With these stoves (open accor-ding to design), the chimney draught continues to extract hea-ted air from the room with the corresponding energy after theflame has been extinguished. During this process, a large amo-unt of the heat energy from the combustion stored in the stoveis also lost. Thermal flue dampers respond to the prevailingoperating state of the burner according to the heat generated -shortly after the burners switch off, the damper closes andprevents the energy losses described above. When the tempe-rature reaches 40°C, the flue damper already starts to openand therefore quickly responds to the combustion heatingappliance starting up. Since the mechanism is temperaturedependent, the opening and closing of the damper is closelylinked to the burner switching on and off. Although this featurelimits its use to type B11 to gas-fired heating appliances, it isideal for the purpose for which it was designed. The motorisedflue damper is the correct solution for all other combustionheating appliances (see Page 12).

Saving energy with the thermal flue damperWith thermal flue dampers, up to 4,000 kWh and more can besaved per year depending on the system (see also Page 5).Thus, the relatively low cost of the installation is recoupedafter only a very short time. Since the expected service life ofthe flue damper is long, an effective saving rapidly come intoeffect. As a result of the lower fuel consumptions, the fluedamper also reduces emissions and for many, this is reasonenough to install this component.

Types of flue damperFlue dampers have been tested and approved for the suitablegas-fired heating appliances according to DIN 3388 Part 1 (seealso Page 9) in each case. Different versions are therefore avai-lable (see also below or Page 8).

Series GWR wall-moun-ted units For instantaneous gas-firedboilers and combi-boilers

Series HKS freestanding appliancesFor gas-fired boilers, storage waterheaters and heating inserts

Series HOK special appliancesGas-fired appliances according tomanufacturer's specifications

Series HOS small appliancesFor space heaters, storage waterheaters and heating inserts

Housing made from stainless steel with integrated shut-off elements and at least two independently operating controllers consisting of thermo-bimetallic strips, plated with stainlesssteel on both sides, opening at approx. 40°C flue gas temperature at the installation position, suitable for all gas-fired appliances, power-regulated with/without pilot light (electro-nic), with flue-gas monitoring mechanism and with CE ID number.

10


11

CE registration number

Suitable for all appliances up to280°C flue-gas temperature (depending on flue-damper type)

Reliable operation due tomultipart shut-off compo-nent

Silent operation

Opening starts from approx.40°C flue-gas temperature

Short opening times

Non-hinged bearingSmall installation height

Suitable for all B11 gas-fired applian-ces, power regulated with/without pilotlight (electronic) and with flue-gasmonitoring device

Corrosion resistantstainless steel

100% quality control

•

•

•

•

•

••

••

••

� Opening starts from approx. 40°C

� Fully open from 70°C or 90°C

� Flow resistance < 2 Pa

� Independently operating dampers

� Corrosion resistant

� Robust design

� Not susceptible to contamination

� Maintenance-free (test carried out by chimney sweep)

Key data of thermal flue dampers

� Conserve energy

� Reduce losses when combustion heating appliance is switched off

� Prevent heated room air from escaping via the chimney

� Prevent loss of heat stored in the stove

� Improve building energy balance

� Prevent flue-gas back-flow

� Protect environment by decreasing emissions

� Reduce fuel consumption

� Very short payback periods

Advantages of thermal flue dampers


The motorised flue dampers

Motorised flue damper operationMotor-actuated flue dampers can be used for all oil- and gas-fired appliances with or without forced draught burners and forsolid-fuel heating appliances. Unlike thermal Diermayer dampers,they open before the burner starts or optimise the combustion ofthe solid fuel in combination with the stove regulator. During thetimes when the combustion heating appliance is switched off,the flue path is sealed off so the heated room air is preventedfrom escaping via the chimney and cooling the appliance as itpasses.The motorised version can be actuated in different ways, e.g.manual control via a power switch, temperature-dependent con-trol via a thermostat installed upstream or fully automatically viathe stove regulator (see also Page 14).

Saving energy with the motorised flue damperUp to 4,000 kWh and more can be saved per year with motorisedflue dampers depending on the system. The payback period formotorised dampers is somewhat longer than the payback period

for thermal dampers. Because the expected service life is long,motorised flue dampers are always a profitable investment. Sinceflue dampers reduce fuel consumption, emissions are also redu-ced and for many, this is reason enough to install the device.

Safety and reliability with cascade systemsWith systems connected to many appliances, the flue is opera-ting more and more under conditions of overpressure. Back-flowpreventers are therefore specified to prevent the backflow of fluegas through appliances which are switched off. Tight-closingmotorised flue dampers according to DVGW code of practice G 635 are ideal for this task to ensure high operating reliability.

Types of flue damperMotorised flue dampers have been tested and approved for suit-able gas-fired heating appliances according to DIN 3388 Part 2(see also Page 9) in each case. Different versions are thereforeavailable (see also Pages 8 and 12).

12

Series MOK For applianceswith pilot light and solid fuelswith minimum opening forunderpressure flue systems..For flue gas temperatures up to400°C.

Series MOK... AD For applianceswithout pilot light, without condensatedeposits, metallic tight closing forunderpressure flue systems, up to400°C. Housing up to Ø 300 mm inplug-in version.

Series MUK For appliances without pilot lightwith condensate deposits or cascade plants, metal-lic tight-closing, condensate-resistant, for over-pressure and underpressure flue systems up to200°C. With version with sealing rim up to 140°C.With pressure and condensate-tight shaft bushing.

Motor-actuated flue dampers according to DIN 3388 Part 2 for gas- and oil- fired systems as well as solid-fuel boilers on underpressu-re and overpressure flue systems, CE symbol according to EC directive 89/392/EEC, 73/23/EEC and 89/336/EEC.

Series MUK 80/125 and MUK 100/150 For flue systems according to DVGW code ofpractice G 635 (LAS overpressure), damperseal with sprayed-on EPDM seal, up to140°C. Pressure and condensate-tight shaftbushing.


� Suitable for all fuels

� Regulator element for improving combustion quality

� Conserve energy

� Reduce losses when combustion heating appliance is switched off

� Prevent escape of heated room air via the chimney

� Prevent loss of heat stored in the stove

� Improve building energy balance

� Prevent flue-gas back-flow

� Protect environment by decreased emissions

� Reduce fuel consumption

� Short payback periods

Advantages of motorised flue dampers

Maximum operational reliabili-ty due to shaft being positivelyconnected to the limit switch

For underpressure and overpressure systems

Alternatively with minimum opening or tight closing

Operational monito-ring and manualactuation

Housing from Ø 80 - Ø 1,000 mmTested according to DIN 3388 Part 2with DIN DVGW registration number

Heat resistant up to800°C, depending on thedesign of the damper

Special motor retaining plateprevents the transfer of heat

from damper to motor

Sealing rim madefrom EPDM

Tight for systemsaccording to DVGWCode of Practice G 635with sealing rim only upto 140°C.

Heat-resistant seal interruptsthe heat transfer to the

motorHousing and dam-per componentsmade from durablestainless steel

The right control drive for everyapplication (simple electricalconnection)

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•

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13

� Maximum operating reliability due to patented mechanism

� Integrated circuit breaker

� Operation monitoring and manual operation possible

� Simple electrical connection

� Long service life

� Due to early opening, no flue-gas back-up

� Minimum closure times

Key data for motorised flue dampers


The fire regulator will provide your woodfire with the best conditions for efficientand emission-free combustion.

Energy should develop its potentialWood-burning fires are very sophisticated and worth making theeffort for, burn naturally and can produce any level of heat. Diffe-rent phases of the heating process demand flexible combustionheating appliances. A wood fire needs different conditions for hea-ting up, burning and when the embers die down in order to makeoptimum use of the energy stored. This is the purpose of the stoveregulator. It creates the conditions required by the stove to gene-rate the maximum quantity of energy with the minimum consump-tion of fuel. This is also good news for our environment since theemissions from a fire which is regulated in this way are consider-ably lower than 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 takes appropria-te measures accordingly. The difference between control andregulation is like the difference between a monologue and a dialo-gue - the stove controller understands the fire!

The stove regulator

"The difference between controland regulation is substantial"

14

Sensors, control elements and monitoring unit with display. The fire regulatorcollects various pieces of information according to the scope of your installationin order to make the right decisions for your fire.


The draught limiter

Motorised draught limiters The motor actua-tor also facilitates secondary functions such aschimney ventilation or selective combustion opti-misation (in conjunction with the stove regulator).

Precision draught limiters These draughtlimiters offer maximum regulation accuracy, aremanufactured to a high level of precision andhave an overpressure damper as an additionalsafety function.

A small component with a big effectDraught limiters (also referred to as secondary-air devices inGerman Standards Institute standard DIN 4795) are mechanical ormotorised components which produce uniform underpressure conditions in a flue system. As soon as the draught in the chimneyexceeds the optimum value, the draught limiter opens and limits theunderpressure by supplementing the amount of air supplied. As soon as the pressure normalises, the damper closesagain. This method, which is both simple and effective, facilitatesuniform combustion and generates measurable energy savings. The investment in draught limiters is recouped via the reduced fuelconsumption after only a short payback period and is a simple wayof reducing heating costs, both in the industrial and domestic sector. Another argument in favour of draught limiters is the reduction in pollution caused by stabilised combustion.

Low-priced draught limiters The basicmodels concentrate entirely on optimising theflue system and facilitating uniform combustion.

Draught limiters for large systems Argumentsrelating to cost are particularly important withindustrial applications. Regulating the flue-gasunderpressure by means of a draught limiter also results in smooth combustion so combustion heating appliances operate at constant high efficiency. Useful saving models can be calculatedfrom this, depending upon the system.

"Draught limiters compensate for fluctuations inunderpressure and stabilise the efficiency

of your system throughout the whole year."

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 flue damper product range - Kutzner+Weber: Home flue damper product range ... Legend TL: Temperature air Tu: ... led between the stove and chimney, sealing off the route to the