Energy Recovery Ventilation System
10
as resistance gets bigger. When the air flow goes through the ducts, the ducts will
generate resistance to the air flow. If the duct length is too long, duct diameter is too
small and elbows are too many, air resistance in the duct will increase and air
volume will be decreased. To avoid performance degradation, please follow the
following recommended principles for installation and design:
(1) The total length of air inlet duct and air return duct shall be designed
according to the characteristics of the site. The resistance of the air duct
shall not exceed the static pressure requirement of the unit. The air duct
should be made of nonflammable or non-combustible materials.
(2) Elbow shall be set as little as possible. Elbow quantity in each duct line
shall be within 3. The bent part of elbow should be designed as a circular
arc, avoiding a 90° right-angle bend.
(3) Try to avoid using it if the resistance difference of pipeline at both sides
of air outlet of fresh air unit is big.
(4) The outer wall of the ducts connected to the outdoor side (fresh air inlet
duct and discharged air outlet duct) should be insulated; the installation
should be inclined to the outdoors with a slope of 1/100~1/50 to prevent
rainwater intrusion.
Fig.2 Installation Diagram of Outdoor Connection Duct
(5) The internal wall of duct shall be smooth, not afford to dust and not
folded. Outdoor air inlet port shall be installed in the area where is
convenient for maintenance.
(6) If the user wants the indoor noise as small as possible, the muffler shall
be applied in the connection joints of air ducts. Please consult with a
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