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EVH-X SPACE 2.1 - 12.1
M0SM10N17-03
General
Proper execution and sizing of air connections are
essential for ensuring correct operation of the unit
and an acceptable level of silence in the room.
When designing and creating ducts, consider
PRESSURE DROPS, FLOW RATE and AIR SPEED
which need to be compatible with the characteri-
stics of the unit.
Special consideration needs to be made for
pressure drops that are greater than the unit's
static pressure, which would lead to a reduc-
tion in flow rate resulting in unit shutdown.
• the weight of the ducts must not be supported
by the connection flanges
• place anti-vibration joints between the ducts
and the unit
• the connection to the flanges and between the
various sections of the ducts must ensure an
airtight seal, preventing leakage in delivery and
return which would compromise overall system
efficiency.
• limit pressure drops by optimizing the path,
the type and number of curves and the bran-
ches
• use curves with a wide radius. Consider
whether it might be useful to equip them with
deflectors (especially if the air speed is high
or if curves are tight)
F e a t u r e s f o r d u c t s f o r t r e a t e d a i r
• The inner surface of the duct must be smooth
and washable. It must not contaminate the air.
• Thermally insulate the ducts and the flanges
so as to prevent loss of energy and condensa-
tion build-up.
GRILLES OUTLETS DIFFUSERS
Proper distribution of air in the room is essential
for ensuring comfort levels.
In the selection and positioning of grilles, outlets
and diffusers, the following are to be avoided:
• excessive air speed
• formation of stagnant zones and layering
• entry of cold air into the room
• formation of localized currents (due to uneven
air distribution)
• excessive variations in ambient temperature in
the vertical and horizontal planes
• short circuiting of delivery air towards return
air
For purposes of comfort, the following things need
to be considered:
• air diffusers must be selected by checking the
sound power generated at nominal flow rate
conditions
• the disconnections to the diffusers are to be
made using flexible elements
the return grilles must be amply sized
APPLICATIONS AT HIGH DEGREE OF SILENCE
For applications that require a high degree of silen-
ce in the system:
• In delivery and return, provide septum silencers,
preferably inserted in sections of ducts located
outside the building.
• Equip all curves with deflectors
6 AERAULIC CONNECTIONS
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