How to install a kitchen hood with external extraction?

How a range hood is installed depends on the exhaust system. The technique is very complicated if you choose to install a hood with evacuation to the outside, which is the case if you have purchased an extraction hood. You don’t get into this type of work if you’re not used to tinkering. The kitchen designers are professionals who do this very well and they guarantee their intervention.

What is a kitchen extractor hood?

This is the most effective type of hood for evacuating:

  • Water vapor,
  • oily smoke,
  • Cooking smells.

Unlike the recirculation hood or extractor hood without exhaust which returns the purified (or recycled) air to the room after it has passed through a filter, the extraction hood draws in the ambient air which passes through a metal filter then evacuates it directly to the outside. The extractor hood requires the installation of an exhaust duct.

Materials needed to install an extractor hood

  • Stable stepladder,
  • Drill,
  • Burineur,
  • electrician screwdriver,
  • Phillips screwdriver,
  • Sand,
  • Cement,
  • Some water,
  • A cat’s tongue trowel to press the mortar,
  • Metre,
  • Spirit level,
  • Crayon,
  • Clamps,
  • Ventilation duct,
  • male electrical plug,
  • Extraction kitchen hood.

Precautions to take before installing an extractor hood

The hood can only be installed if the connectiont was created. Of course, you don’t connect your kitchen hood with external extraction to the VMC! You need a specific device.

So that the draw be the most performant possible, we have of course taken care to buy a hood whose outlet is perfectly adapted to the diameter of the duct and that of the duct. It is preferable that the latter is not bent to optimize the evacuation and therefore, that the hood is as efficient as possible. However, if this cannot be avoided, it is recommended not to use a 90° elbow but to opt for the installation of two 45° elbows.

You should also think about buying a sufficiently powerful hood. For this, we take into account the volume of the room, knowing that it can be substantial if you have a kitchen open to a spacious living room. In 60 minutes, a hood proves to be really effective when it renews 12 times the volume of air in the entire room (kitchen + living room).

Installation principle of an extraction hood

If it is strongly recommended to entrust the installation of your extractor hood to a kitchen designer, it is because you have to be in the business for the equipment to work perfectly. For example, you need:

  • Drill grooves in the wall,
  • Set up the exhaust chimney,
  • Install ducts,
  • Hang the hood,
  • Adjust the horizontality of the hood,
  • Make electrical connections…

In principle, this requires drawing a vertical line up to the ceiling, well in line with the hob since it will be overhung by the hood, but also to bring a chisel to dig the wall . Then you have to dig the grooves to put the sheaths in place. There, things get complicated if you have no experience in the field at all because you have to place the electrical wires used to supply the lighting system on the one hand, and the hood on the other. -same. When all the connections are made, the bleeding must be plugged. To do this we use plaster.

We then move on to laying a cuff in the hole intended for the evacuation (this is what the pros call the reservation). It must be sealed so that it does not move. Its role is to protect the fittings and the evacuation duct.

For the assembly of the hood, it is necessary make coincide the middle of the reservation with the middle of the hood. We check the balance at the spirit level then we move on to setting up the hanger brackets who will maintain the hood. Once it is suspended, the adjustment screws of the legs are used to adjust the horizontality, again using a spirit level.

The installation of this type of development requires a certain versatility from the speaker.

When you want to connect your brand new hood to the exhaust chimney (this must have been installed by a craftsman or a kitchen designer), the installation principle consists of:

  • Install the duct making sure to guarantee theduct sealing thanks to the two clamps by placing them as follows:
    • the first to the wall outlet,
    • the second at the exit of the hood.
  • Connect the electric wires to the domino of the junction box, taking care to respect the colors.
  • Fix the lower element then the upper part of the hood at the level of the kitchen ceiling by sliding it into the lower element,
  • Put the protective grille in place, making sure that the connection between the sleeve and the sheath is perfectly ensured so that the seal is optimal. The sleeve must then be sealed with mortar made up of 25% cement and 75% sand and a little water.
  • Use the spade trowel to compress the mortar.
  • Fix the protective grid on the sleeve thanks to its clipping claws. It can be unclipped later to be cleaned.

All that remains is to check if everything is working well, suction, air evacuation to the outside and lighting of the hood. From now on, cooking odors should no longer be an ordeal, and there should no longer be a greasy film on the kitchen units or steam on the walls.

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