The exhaust hoods are in every kitchen. They give it a certain style and character. They remove smells, clean the air and prevent grease deposition.
Choosing the right exhaust hood is difficult, so is its installation. The main function of an exhaust hood is removing the smell of the food cooked in the kitchen. The exhaust hood prevents grease deposition, cleans the air and removes the moisture excess. It would seem that it is simple, yet many of us have trouble buying one. While choosing the exhaust hood we must take into consideration the style of our kitchen, its size and access to the ventilation shaft.
If the exhaust hood is not connected with the ventilation shaft, it serves as an absorber. It works in closed circuit then. It sucks the air up, degreases it, absorbs the smells and then lets it back into the kitchen. Before buying the exhaust hood, you need to make sure that there is a possibility of connecting it to the ventilation shaft.
However, if it would be connected to the ventilation shaft, you must pay attention to install it correctly and hang it on the proper height.
The work mode in the open circuit is twice as effective as the one in the closed circuit.
The structure of the exhaust hood
In the exhaust hood there can be found parts as: an engine, filters and devices that perform the additional functions – light, system which prevents the sucked gases to move back to the kitchen and liquify on the exterior of the device, electic clocks, etc.
The engine drives the ventilator which sucks the air up. In most exhaust hoods the engine is placed inside the casing. The noise produced by the engine is muffled by the special cladding. The more expensive and better solution is placing the engine in the ventilation shaft.
The carbon filter absorbes smells in the kitchen. It needs to be changed every few months. Some models have a cleanliness indicator.
The fat separator filter absorbes grease present in the steam. Acrylic, aluminium and steel filters do not require changing, but they need to be cleaned and maintained.
Diffrent kinds of exhaust hoods
There are many kinds of exhaust hoods available on market.
Wall-mounted exhaust hoods are installed directly to the wall.They are also known as chimney hoods because they have a chimney. In most cases they have a rectangle, semicircular or oval shape. They are available in different sizes. This kind of exhaust hoods is suitable for bigger kitchens.
Corner exhaust hood has a shape of a square with cut corner. It is installed in the corner of the kitchen.
Integrated exhaust hood is equipped with a plate which blocks or unblocks the air flow to it. Removing the plate turnes on the ventilation and inserting the plate stops the ventilation. It is a built-in exhaust hood.
Another built-in exhaust hoods can be turned on by opening the cabinet where they were installed. Their construction allows to fit them snugly in the kitchen.
Under cabinet exhaust hoods are also built-in hood. They are built-in to the cabinet in a way that they are visible only from below. They fit perfectly between the cabinets because of their size.
Another type of exhaust hood is an island exhaust hood. It is installed to the ceiling in any place of the room. It has a ventilation shaft taken out up vertically, so it has to be installed on the ceiling with some distance to the wall. They are rectangular, round or square. They are good for larger rooms because of their way of installation.
The width of exhaust hood should be the same or larger than the width of the kitchen.
The exhaust hood should be placed 65-75 cm above the cooker. The best height is 65 cm for electric burner and 75 for gas burner. You have to remember that the ventilating fan can’t be mounted to the wires of mechanical ventilation. Exhaust hood with ventilating fan can’t be mounted to gravity ventilation system. It should have seperate, tight wire.
If the main air conductor is vertical, it has to be slightly tilted, at an angle of 10 º. The diameter of the conductor should be not smaller than 12 cm.