How Does a Chimney Work?

how does a chimney work

What’s a Kitechen Chimney and What does it do?

A kitchen chimney, also known as a range hood or exhaust hood, is an essential kitchen appliance used to ventilate and purify the air in the cooking area. It is typically made up of a canopy or hood installed above the hob or stove. A kitchen chimney’s primary functions are as follows:

Remove Smoke and Odours: When you cook, especially when frying or grilling, smoke and strong odours are produced. The exhaust fan on the chimney collects this polluted air and directs it outside, preventing the kitchen from becoming smoky and smelly.


Filtration of Grease and Oil: Cooking activities release grease particles into the air, which can settle on kitchen surfaces and appliances, making cleaning difficult. Filters (typically made of aluminium or baffle filters) in kitchen chimneys trap these grease particles, resulting in a cleaner and more sanitary kitchen environment.

Air Circulation: Instead of exhausting the air outside, modern kitchen chimneys recirculate it and filter it through charcoal filters. The purified air is then returned to the kitchen. This feature is useful when installing a chimney without the option of external ducting.

Temperature Control: Chimneys help to maintain a comfortable cooking temperature by extracting excess heat produced during cooking, keeping the kitchen cool and less prone to overheating.

Kitchen chimneys contribute to a healthier, cleaner, and more pleasant cooking environment while also helping to preserve the aesthetics of the kitchen space by effectively performing these functions.

What are the different types of chimneys?

#1) Wall-Mounted Chimneys:

  • These are fastened directly above the hob or stove to the kitchen wall.
  • Perfect for traditional kitchen layouts.
  • efficient at eliminating smells and fumes from cooking.

#2) Island Chimney:

  • positioned above a kitchen island with a hob and suspended from the ceiling.
  • Provides a chic, open layout ideal for contemporary kitchens.
  • Needs venting through the ceiling in order to release fumes.

#3) Corner Chimneys:

  • Made to squeeze into kitchen nooks and maximise the little amount of wall space available.
  • ideal for kitchens where the wall space next to the cooker is limited.

#4) Chimneys Installed:

  • Because these chimneys are built into the kitchen cabinets, they appear seamless and hidden.
  • Ideal for modular kitchen arrangements.

#5) Chimneys with straight lines:

  • Positioned with the hob in a straight, horizontal line.
  • Incorporate a modern, clean design in the kitchen.

#6) Slanted Fireplaces:

  • Have a slanted canopy, which makes them ideal for kitchens where there isn’t much room above the cooker.

#7) Corner Chimneys:

  • Designed to maximise space utilisation by installing in kitchen corners.
  • Ideal for kitchen layouts that aren’t typical.

#8) Single Flue Chimneys:

  • Has a single exhaust pipe to let smoke and fumes from cooking out.

#9) Multi-Flue Chimneys:

  • Intended for use in large-volume commercial kitchens.
  • Several exhaust pipes should be used to manage high emissions.

#10) No flue Chimneys

  •  No external ducting is needed for these chimneys.
  • Ideal for kitchens without ducting; They use filters to filter air before recirculating it into the space.

#11) Chimneys with Hoods:

  • Features larger hoods that effectively capture more cooking fumes and smoke.
  • Ideal for kitchens with heavy-duty cooking needs.

#12) Chimneys with Exhaust Fans:

  •  Improve the removal of smoke and odours by incorporating integrated exhaust fans.
  • Increase air purification’s effectiveness.

#13)  Masonry Chimneys: 

  • Traditional chimneys built using bricks or stones.
  • Offer a classic, rustic look to homes.

#14) Dual Flue Gas Chimneys:

  • Designed for gas fireplaces, these chimneys have two flues.
  • One flue vents exhaust, and the other draws in fresh air.

#15) Electric Chimneys:

  • These energy-efficient devices run on electricity.
  • Simple to maintain and install.
  • Fit for contemporary kitchens.

#16) Prefabricated Metal Chimneys:

  • Usually made of metal, these chimneys are prefabricated and simple to install, making them perfect for homes without traditional masonry chimneys.

#17)  Chimneys with Liners:

  • These chimneys have inner liners for increased safety and insulation. The liners also help to efficiently direct gases and fumes out of the chimney.

What are the main components in a chimney?

Here are the main components of a chimney:

  1. Motor: The motor, also known as the exhaust fan, is responsible for drawing in air and cooking fumes from the stove.
  2. Blower: The blower is connected to the motor and helps in expelling the captured air outside through the duct.
  3. Filters: Filters are essential for purifying the air before it’s recirculated or expelled. There are various types of filters, including baffle filters, carbon filters, and mesh filters.
  4. Ducting: The ducting consists of pipes or channels that transport the filtered air from the chimney to the outside of the kitchen. It helps in expelling the fumes and odors.
  5. Control Panel: The control panel contains switches or buttons for operating the chimney. It allows you to adjust the fan speed, turn on/off the lights, and control other features.
  6. Lights: Chimneys come with built-in lights to provide better visibility while cooking. These lights are often installed in the canopy area.
  7. Housing: The housing or canopy is the visible part of the chimney. It’s typically made of stainless steel or other materials and houses the motor, filters, and lights.
  8. Chimney Pipe: The chimney pipe connects the hood or canopy to the ducting system. It plays a crucial role in directing the airflow.

These components work together to ensure efficient smoke and odor removal from your kitchen, keeping the air clean and fresh while you cook.

What are the type of chimney filters?

An essential part of kitchen chimneys are chimney filters, which aid in clearing the cooking area of smoke, grease, and smells. There are numerous filter types to choose from to meet different requirements and tastes:

Mesh Filters: Mesh filters consist of several layers of stainless steel or aluminium mesh. They may need to be cleaned on a regular basis, but they are effective at catching grease and solid particles.

Carbon Filters: Often referred to as charcoal filters, carbon filters work well to eliminate fumes and smells from the air. They function by adsorbing the smell molecules onto the porous surface of the carbon.

Baffle Filters: These filters are made of curved panels that serve to separate oil droplets from air. They work well for Indian cooking, which involves a lot of frying, because they are very effective at collecting grease.

Chimneys with Auto-Clean Features: These chimneys have an auto-clean feature that minimises the need for manual maintenance. The grease is melted using a heating element and then runs into a collection tray.

Cassette Filter: Housed in a small cassette design, cassette filters are made of multiple layers of stainless steel or aluminium mesh. They are simple to maintain or replace and offer effective filtration.

Every kind of filter has benefits and works well with particular cooking methods and tastes. Grease can be effectively captured by mesh and baffle filters, and odours can be effectively eliminated by carbon filters. The user’s needs and cooking habits determine which filter to use.

How to service and maintain a chimney?

For a chimney to operate as efficiently as possible, maintenance and servicing are necessary. The following advice can be used to maintain and service a chimney:

  1. Regular Cleaning: Cleaning is the most important aspect of chimney care. Over time, dust, smoke, and grease build up in the filters and ducts. Cleaning the ducts at least once a year and the filters every two to four weeks is advised. To clean the filters, use a solution of warm water and mild detergent. Hiring a professional is the best option for duct cleaning.
  2. Professional Servicing: It is recommended that you have an annual professional cleaning for your chimney. A technician will clean the ducts, perform any necessary repairs or replacements, and do a comprehensive inspection of the motor, blower, and other parts.
  3. Safety Measures: Make sure the chimney is unplugged from the power source before starting any maintenance. This will shield any electrical mishaps or accidents that may occur while cleaning or servicing.
  4. Check for Damage: Make sure the chimney is regularly inspected for wear and tear or obvious damage. Check for evidence of damaged wiring, loose screws, or rust. Deal with any problems as soon as possible to stop more harm.
  5. Grease Traps: Grease traps are a common feature on chimneys. To avoid blockages and bad odours, these should be routinely emptied and cleaned.
  6. Replacement of Filters: Filters have an expiration date and must be changed after a certain amount of time. For information on the suggested schedule for filter replacement, consult the manufacturer’s instructions.
  7. Ventilation: Make sure there is adequate ventilation in the kitchen. An adequate ventilation system can lessen the amount of work that needs to be done on the chimney and stop smoke and grease buildup.
  8. Seek Professional Assistance: It’s best to get in touch with a qualified technician for help if you hear any strange noises coming from the chimney or if it seems to be malfunctioning. It can be risky to try fixing electrical components on your own if you don’t know how.

Your chimney can last longer and continue to keep your kitchen fresh and odor-free if you adhere to these maintenance recommendations and get professional servicing when needed.

How to choose the right chimney for your kitchen?

To keep your kitchen odor-free and spotless, choose the correct kitchen chimney. The following are things to think about when selecting a chimney:

  1. Chimney Size: Verify that the size of the chimney and your hob are the same. Ideally, the chimney should be slightly wider than your hob in order to adequately capture all of the smoke and fumes.
  2. Types of Kitchen Chimney Filters: Baffle, cassette, and carbon filters are the three main types of filters. Indian cooking benefits greatly from the use of baffle filters because they are low maintenance and have a high capacity to capture oil. While carbon filters aid in the removal of odours, cassette filters are a more affordable choice.
  3. Chimney Suction Power: The cubic metres per hour (m3/h) of the chimney’s suction power are measured. It ought to be in line with the size and degree of cooking in your kitchen. Use a higher suction power when grilling and frying in large quantities.
  4. Duct Installation: Select a chimney, ductless or ducted. Whereas ductless chimneys use filters to clean and recirculate the air, ducted chimneys release smoke and fumes outdoors. Although ducted chimneys are more effective, they must be installed close to an exterior wall.
  5. Noise Level in Kitchen Chimney: Take note of the decibels (dB) that the chimney produces. Particularly if your kitchen is close to the living areas or has an open design, lower noise levels are preferred.
  6. After-sales Services & Warranty: Verify whether the manufacturer offers a warranty in addition to after-sales services. If necessary, a good warranty guarantees hassle-free replacements and repairs.
  7. Budget: Establish a spending limit and look at chimneys that fit within it. A chimney is an investment you should make in your kitchen over the long term, so weigh cost and quality.

What are the common issues in chimneys?

Kitchen chimneys are vulnerable to a number of problems that may impair their functionality and performance. The following common problems and their fixes are listed:

1. Grease accumulation

  • Problem: The accumulation of oil and grease in the chimney over time can reduce its suction power.
  • Solution: Take out and wash the filters on a regular basis to keep the chimney clean. The stubborn grease can be removed with a degreasing agent.

2. Filter Replacement

  • Problem: Particle-clogged filters may require replacement.
  • Solution: Replace the filter according to the manufacturer’s instructions, which call for doing so every six to nine months.

3. Minimal Suction Power:

  • Problem: Blocked ducts, malfunctioning motors, and clogged filters can all lead to decreased suction power.
  • Solution: Check for and remove any blockages in the ducts, clean or replace the filters, and if the problem still exists, have the motor inspected by a specialist.

4. Noise pollution caused by a chimney:

  • Problem: Noisy chimneys can cause annoyance and disturbance in the kitchen.
  • Solution: Verify that the chimney is set up correctly. See a technician to look for worn-out or loose parts if the noise continues.

5. Control Panel with Gesture, Touch, and Push Buttons Not Working:

  • Problem: Electrical or sensor problems may cause the control panel to become unresponsive.
  • Solution: Inspect for loose connections and problems with the power supply. For repairs, get in touch with a technician if the issue continues.

6. Non-functioning Fan and Light:

  • Problem: If the lights and fan aren’t working, there might be an electrical or switch issue.
  • Solution: Check switches, make sure the power supply is working, and replace any damaged parts as needed.

7. Excessive Vibration

  • Problem: The cause of excessive vibrations might be an imbalanced or misaligned chimney.
  • Solution: During installation, make sure the chimney is mounted and balanced correctly.

8. Chimney LCD Panel Not working

  • Problem: Issues with the control panel or power supply may be the cause of a blank display.
  • Solution: Replace any broken display units and inspect the power supply and connections.

9. Odour/foul smell

  • Problem: Inadequate suction power or problems with the filter could be the cause of lingering smells.
  • Solution: Take care of the odor’s underlying causes by maintaining the chimney’s

Kitchen chimneys need to be maintained regularly and repaired in a timely manner to remain functional. It’s best to get professional help from licenced technicians or service providers if issues continue or appear complicated.

What is downdraught in the chimney?

Downdraught in a chimney refers to the situation where, instead of drawing air and smoke upwards and out of the chimney, the airflow is reversed, causing air and potentially harmful fumes to be pushed back down into the room. Downdraught can occur for various reasons, such as atmospheric pressure changes, poor chimney design, strong winds, or blockages in the chimney.

Downdraught is a common issue in chimneys, and it can be problematic as it may result in poor ventilation, difficulty in lighting fires, and the release of smoke and harmful gases into the living space. To mitigate downdraught, various solutions can be employed, including using anti-downdraught cowls or caps, adjusting the chimney’s height, or improving the overall chimney design to enhance its draft efficiency. It’s important to address downdraught issues to ensure the safe and efficient operation of fireplaces and heating appliances.

How much does it cost to buy a chimney?

It’s obvious that cost varies based on various factors and chimney types, however, for home use we have listed few which we considered as the best along with the price. Check them out.

Where to buy a chimney?

Considering the bazillion options, this is a confusing deal right? Worry not! We have compiled some odf the best for you.

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