CRITERIA FOR THE CHOICE OF THE EXTRACTION AND INSUFFLATION UNIT
The choice of the extraction and insufflation ports is closely linked:
- the specificities of the extraction network
- as well as the room in which they will be installed.
Indeed, there are flow rates and dimensions to be respected when choosing an extract unit or an insufflation unit.
The quality of an air vent influences the quality of air diffusion and the comfort of the occupants. The insufflation flow rate, the jet range and the opening mode are some of the main considerations in the choice of an insufflation mouth.
In order to allow a better mixing of the air present in a room, the blowing mouth must present a flow adapted to the volume to be mixed. The air speed must be maintained at 0.2 m/s for optimal diffusion.
The jet range of the blowhole must also be taken into account. The jet range of the air outlet determines the convective air circulation in the room and therefore the optimal mixing of the room air. Thus, this throw range must be at least 2/3 of the length of the part.
- Fixed and mobile finned vents
The advantage of fixed finned vents is that they are easy to install. However, they cannot be tilted. It is therefore necessary to ensure that they are well positioned when installed.
On the other hand, the movable finned vents can be slightly tilted up or down. You can adjust their inclination to achieve the Coanda effect. This phenomenon creates an “air gap” which is essential to homogenize the air diffusion in the room.
The extract unit must satisfy an optimal extraction flow in the room where it will be installed. The choice of the extract unit is made according to the technical advice of the BET which will direct you on the dimension and the minimum flow to respect.
In addition, the regulation recommends a maximum air velocity of 0.2 m/s at the outlet of the extract unit. The objective is that the device set up can extract the existing volume of air in an ideal time.
- The quality of the filters
By drawing in stale air, the exhaust vent retains residues that can easily clog it. Good quality filters contribute to the efficiency of the extract units. So remember to choose your filters carefully to avoid clogging up too quickly and clogging your extract units.