Casing of EC models made of magnesium zinc plated sheet metal with corrosion class C5. Casing of AC models made of galvanized sheet steel, corrosion class C3.
Casing of all fans is completely acoustically/thermally insulated and has internal surface liner that prevents the migration of insulation fibers into the airstream.
All casings has circular connection spigots with rubber seals. EC models are also equipped with an external terminal box with protection class IP65.
Impeller
AC models use double inlet radial fans with forward-curved impellers made of sheet steel.
EC models use backward curved radial impellers. These are from lightweight, hard-wearing fiberglass reinforced polyamide.
All impellers dynamically balanced and paired with corresponding external rotor motors.
Motor
Depends on type, fans are equipped with AC or high efficient EC external rotor motors. All motors are suitable for 50Hz and 60Hz.
The input voltage for EC motors single phase can vary between 200 and 277V, for three phase between 380 and 480V.
Motor protection
Models with AC motors have prewired integral thermal contacts TK with leads to external motor protection device.
Models with EC motors have an integrated electronic thermal protection, including locked-rotor protection and soft-start.
Control
EC motor with built-in potentiometer to adjust working point can be also controlled by external signal 0-10V.
AC motor can be controlled by 5-step or stepless speed regulator
Fans can be demand controlled via additional accessories like sensors and controllers for CO2, temperature, humidity, presence indication, etc.
Installation
KVK DUO fans can be installed in any position indoor and outdoor. Circular spigot with rubber seals is perfectly designed to connect to the circular ducts by using fast clamps FK preventing vibration to the duct. A service cover with screw connection and hinges with pins make cleaning and maintenance easy.
