6 Things to Know Before Installing a Ducted Kitchen Chimney

When buying a ducted kitchen chimney, it is of utmost importance that one is informed about the various background essentials like duct cut-out, outlet pipe size, etc. It is often seen that people purchase a kitchen hood, without even paying attention to the duct size and other relevant considerations for a ducted chimney. All this leads to inconvenience later and makes the purchase ineffective.

In our article, we have focused upon the intricate details of the installation essentials and all other factors that must be kept in check before purchasing a ducted chimney. From duct size to the material of the outlet pipe, we have covered it all. So, without much ado, let’s get started.


Things to Consider Before Installing a Ducted Chimney

Consider Before Installing a Ducted Chimney

A ducted chimney, as we know, is the one that requires a duct construction to expel smoke and odour outside the kitchen. But, for effective performance, it is crucial that appropriate pipe size, material, duct size, etc., is paid attention to. Let’s consider all the factors that are as significant as the chimney details for a sparkling clean kitchen.


Space Availability for Duct Construction and Chimney Installation

Duct Construction and Chimney Installation

Space availability is one of the most significant factors to be considered before installing a ducted chimney. One must ensure that the required space is available for a duct to be constructed. And, if not, there must be some provision made for getting brickwork done.

The ideal size for the chimney duct is a little more than six inches. Before investing in a top ducted kitchen chimney, the owner must ensure that at least six inches of space are available for proper ducting. In addition to this, the size of the chimney should also be considered.

Often, people go for the chimney size that is either too small or too big for their kitchen. Since ducted chimneys come in two sizes, i.e., 60 cm and 90 cm, one must be smart in selecting the appropriate size. We recommend a 60 cm wide chimney for a kitchen with two to four gas burners. Whereas, if there are three to five gas burners, a 90 cm wide chimney is a more appropriate option.

However, the standard recommendation is that one should opt for a kitchen chimney that is somewhat bigger or that of the same size as your induction cooktop for better extraction of fumes and smoke. But, if space availability is an issue, the owner must consider other options like a ductless chimney that is more flexible in terms of space and location.


Duct Cut-Out

Duct Cut-Out

A ducted chimney requires a hole or a duct to be constructed on the external wall of the kitchen. This is needed so that the outlet pipe can be connected to the chimney, and the smoke and odours are expelled out of the kitchen. For this purpose, a six-inch or a slightly bigger hole has to be made in a circular shape on the external wall of the kitchen.

The recommended height for the duct construction is that of seven feet above the ground or window lintel level. In case, there is no previously available duct cut-out, the owner must ask the installer to create one in the appropriate place. However, this will cost you additional money that should be taken into consideration.

To avoid additional cost, one can make use of best exhaust fan available in India cut-out for connecting the PVC outlet. But, if there are still space constrictions or allowance issues for rented apartments, a ductless chimney should be preferred over the ducted models.


Outlet Pipe Size

Outlet Pipe Size

The outlet pipe size is just as vital as the duct cut-out for an efficient chimney performance. Usually, most companies offer a six feet long pipe in their installation kit along with the ducted chimney. But, for households where the duct construction is above six feet in length, an extra pipe needs to be fixed.

For Indian Kitchens, we recommend opting for an outlet pipe size of around ten feet for optimum performance. However, the pipe size should not be more than ten feet or less than six to eight feet as it will reduce the chimney’s efficiency.


The material of the Outlet Pipe

material of the Outlet Pipe

Since kitchen chimneys are expensive household appliances, it is essential that the material used is of high quality. In case of excess heat, it is a common sight that PVC pipes melt, which makes the chimney ineffective and results in increased maintenance costs. Therefore, we recommend opting for stainless steel or aluminium outlet pipes, while stainless steel being the preferred choice.

The stainless steel material will bring in the much-needed strength and will also make the chimney more durable. Also, these can withstand high temperatures, ensuring that the pipes would not melt when the heat is high. In addition to this, these are also resistant to rusting, which ensures that the pipes will last a long time. Therefore, one should look for stainless steel outlet pipes in a ducted chimney.


Bends in Outlet Pipe

Bends in Outlet Pipe

Another factor that affects the chimney performance significantly is the number of bends in the outlet pipe. More the number of bends or curves, the lesser will be the efficiency of the chimney. In addition to the lowered efficiency, the noise levels also increase, which can cause disturbance while cooking.

We do not recommend having more than two or three bends in the outlet pipe. Bends usually restrict the fumes or smoke to move to the exhaust, thereby reducing the cleaning efficiency of the chimney. Therefore, for best working, we recommend a smaller pipe (not more than ten feet) with the least number of bends.


Distance from the Cooktop

Distance from the Cooktop

Another important consideration that must be kept in mind before installing a ducted chimney is its distance from the cooktop. Ideally, the distance should not be less than twenty-six inches and should not exceed thirty inches. This distance range will ensure that the smoke, oil, and odours are effectively removed from the kitchen.

Anything less than twenty-six inches will increase the risk of chimney accidents as fire can erupt due to the oil collected in the chimney. In contrast, if the distance of the chimney and the cooktop goes beyond thirty inches, the chimney cannot effectively suck the heat and smoke from the cooking area. This leads to more heat and condensation build-up inside the kitchen, allowing grease or oil particles to settle on the kitchen furniture, thereby defeating the chimney purpose.



The performance of a ducted kitchen chimney not only depends on the appliance specifications but is also affected by the installation process. In our article, we tried to incorporate all the details that are necessary to be considered before installing a chimney. We hope that the article will ease your installation experience.

Did you experience any installation hassles while installing a ducted chimney? Please let us know about your experience in the comments. We would love to hear from you.

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