CLIVET ELFOFresh2 CPAN-U 70-120 Series - GIUTX - Connecting joint for DN90 round tube; CT90 X - Printed curve of 90-degree angle for DN90 round tube; A90 DTX - 90-degree adaptor, double DN90 round tube for DN125 valve + cap

BT15B012GB-00 ELFOFresh² 39
Project criteria for the ELFOAir system
ELFOAir is the aeraulic distribution system that Clivet designed to complete their range of fresh air solutions with active thermodynamic recovery.
Drawing up a project and building the aeraulic distribution system correctly is a fundamental premise to benetting fully from the fresh air produced by
ELFOFresh
2
with thermodynamic recovery.
Incorrect choices in dening the parts and their positions can jeopardise the level of comfort in the house and even jeopardise the correct operation of the
unit itself.
The ELFOAir system is the means through which ELFOFresh
2
provides fresh air inside houses, to guarantee the perfect operation of the distribution system
ELFOAir was designed to oer complete compatibility with all of the ELFOFresh
2
units using the least possible number of elements to oer a complete
solution that is simple to select and install at the same time.
The ELFOAir system must satisfy the following criteria:
• reduced air speed: the high air speed in the ducting can cause noise. To avoid this, it is advisable to maintain the air speed below 3 m/s to ensure there
is no noise, even at night, at a time when there is almost no background noise in the room.
• low pressure drops: the lower the pressure drops, the lower the energy used for ventilation.
In the lay-out project for the ducts it is also advisable to take into account the following solutions:
• it is necessary to try and reduce their extension as much as possible, as well as the use of parts such as curves, which increase drops in pressure;
• plan to install the correct return lter accessory (FAEX) in sizes from 200 to 650 to avoid dust and other forms of dirt from fouling the ELFOFresh²
recovery heat exchanger
To select the right system parts, simply follow the check list below:
Positioning the ELFOFresh
2
unit.
Position of the outdoor air inlets/exhaust
Denition of the outdoor air ducting
Dening the supply/extraction outlets and dumpers
Denition of the room’s distribution system
Inspection of the system’s pressure drops
Positioning the ELFOFresh
2
unit.
The active thermodynamic recovery of ELFOFresh
2
can be set up anywhere inside the house, nevertheless it is preferable to opt for installation in utility
rooms, laundry rooms or bath anterooms. It is not advisable to install it in bedrooms and adjacent rooms, as the reduction in background noise at night,
even with extremely quiet units such as ELFOFresh
2
, could diminish the quality of sleep.
It is advisable to install it near the fresh air outlets in order to reduce the length of the relative ducts and in a position that is central to all of the rooms
provided with ventilation.
Position of the outdoor air inlets/exhaust
The fresh air intake must be positioned in a zone where the concentration of impurities (dirt, odours, exhaust, etc..) in the air is low enough, not too close to
the ground to protect it from dust and other volatile impurities that could be sucked up by ELFOFresh
2
.
The air exhaust must be positioned outside the home. Avoid areas that are against the wind and place it away from terraces, balconies and bordering
properties.
There must be at least 2 metres between the inlets and the exhaust to prevent a “short-circuit” between the two air ows. If this is not possible, install the
grilles next to each other and position the openings with the two air ows facing opposite directions.
Denition of the outdoor air ducting
The ELFOAir system uses exible insulated tubes to channel fresh air to and from ELFOFresh
2
, with a diameter of 150mm for sizes 70-120, with a diameter
of 200mm for sizes 200-300 and a diameter of 250mm for sizes 500-650. In order to reduce the drops in pressure it is good practice to try and reduce the
extension of the ducts and the number of curves to a minimum in the project.
ELFOFresh
2
, thanks to the anti-intrusion dumpers on the fresh air outlets, the metal pre-lter and the ecient ltering section, does not require the
installation of additional lters on the fresh air intake duct.