VENTS TT Silent-M 250

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Inline mixed-flow fans in sound- and heat-insulated casing with the air flow up to 1400 m³/h.

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Description
Characteristics
Capacity diagram
Downloads
Dimensions
Additional diagrams
BIM
Designation key

Description

APPLICATION
New inline VENTS TT Silent-M fans are enclosed in a specially designed sound-insulated casing that ensures silent fan operation in combination with high aerodynamic characteristics. The fans are compatible with round air ducts from Ø 100 up to 450 mm. The VENTS TT Silent-M fans combine wide capabilities and high performance characteristics of both axial and centrifugal fans, thus providing powerful air stream and high pressure.	The VENTS TT Silent-M fans are recommended as a component of the air handling systems for various commercial and industrial premises with high requirements to noise level, i.e. in libraries, conference halls, educational institutions, kindergartens, etc.
DESIGN
The external casing is made of polymer-coated steel. The inner casing perforation let sound waves pass through the holes and fall at a specific angle to the sound-absorbing layer. The casing is internally heat- and the sound-insulated with 50 mm mineral wool layer.	The specially perforated casing and sound-absorbing material provide sound attenuation in a broad frequency band. The inner casing and the impeller are made of high-quality durable plastic.

Due to the conic impeller and special blade profiling the circumferential air speed increases thus providing higher air pressure and capacity as compared to standard axial fans.	The diffuser, the specially profiled impeller and the directing vanes at outlet from the fan casing distribute air flow in such a way as to attain the best combination of high performance and high pressure at low noise level. The fan casing is equipped with an airtight terminal box for connection to power mains.
MOTOR
Single-phase energy efficient double-speed motor with low energy demand. The motor is equipped with thermal switches for the motor overheating protection.	The ball bearings extend the motor service life up to 40 000 hrs. at non-stop operation. The motor has IP X4 ingress protection rating.
CONTROL
The double-speed motors are controlled with a built-in switch («V»option) or an external switch for multi-speed fans (available upon separate order).

TT Silent-M fan with a three-position speed switch
A built-in speed controller (P option), an external TRIAC or autotransformer speed controller (available upon separate order) enable smooth motor speed control when connected to the maximum speed terminal.	T option models are equipped with an adjustable turn-off delay timer, adjustable from 2 to 30 minutes.

TT Silent-M fan with a built-in speed controller
MOUNTING
The fan may be mounted at any place and at any angle within the ductwork system.	Several fans may be installed in one system in parallel to attain higher air capacity or in series to increase operating pressure in the system. The fan casing is equipped with fixing brackets for fastening to the floor, wall or ceiling.
THE FAN WITH ELECTRONIC MODULE OF THE TEMPERATURE SENSOR AND SPEED CONTROLLER («U» OPTION)
The ideal solution for ventilation of the premises with high demands to permanent temperature control e.g. greenhouses.	The fan with the electronic temperature and speed control module provides automatic control of motor speed (air capacity) depending on the air temperature in the air duct or in the room.
The front panel of the electronic module has the following control knobs:
speed control knob for setting the motor speed; thermostat control knob for setting the temperature set point;	thermostat indicator light.
The fan is available in two modifications:
with a temperature sensor integrated inside the fan air duct (U/U1 option);	with an external temperature sensor fixed on the cable, 4 m long (Un / U1n option).

CONTROL LOGIC OF THE FAN WITH THE ELECTRONIC TEMPERATURE AND SPEED CONTROL MODULE
Set the desired air temperature (set point of the thermostat) with the thermostat control knob. Set the required minimum impeller speed (air flow) with the speed control knob. The motor switches to maximum speed (maximum air flow) as the temperature reaches and exceeds the set temperature set point.	The motor switches to the pre-set lower speed as the temperature drops down below the set temperature point. To avoid the frequent motor speed changes, e.g. when the temperature in the supply air duct is equal to the threshold value, the switching delay time is activated.
There are two switch delay control logics for various cases:
The temperature sensor-based switch delay (U option): the motor switches to higher speed as the air temperature exceeds 2°C above the set thermostat set point. The motor revers to the pre-set lower speed as the air temperature drops below the thermostat set point. This control logic is used to keep air temperature to within 2°C. In this case the motor speed switches are rare.	The timer-based switch delay (U1 option): as the air temperature exceeds the set thermostat set point, the motor switches to higher speed and the switch delay timer is activated for 5 minutes. The motor reverts to lower speed as the air temperature drops down below the thermostat set point and only after the delay timer countdown. This pattern is used for exact air temperature control. The speed switches for the fan with U1 option are more frequent as compared to the fan with U option, however the minimum operating cycle at one speed is 5 minutes.

Characteristics

Parameter	TT Silent-M 250 min	TT Silent-M 250 max	Measurement unit
Speed	min	max	-
Phase	1	1	˜
Voltage	230	230	V
Frequency	50/60	50/60	Hz
Fan power	125	177	W
RPM	1955	2440	min^-1
Current	0.54	0.79	A
Maximum air capacity	1110	1400	m³/h
Max. transported air temperature	60	60	°С
Sound pressure level at 3 m	34	38	dBА
Protection rating	IP X4	IP X4	-
Duct diameter	250	250	mm
Sound- and heat-insulated casing	yes	yes	-
Casing material	polymer coated steel	polymer coated steel	-
Weight	15	15	kg
SEC Class	-	-	-
Duct	for round air ducts	for round air ducts	-
Type	supply and exhaust	supply and exhaust	-
Mounting	floor mounting, wall mounting, ceiling mounting, Inline	floor mounting, wall mounting, ceiling mounting, Inline	-
*	To meet the requirements of ErP 2018, a speed controller and local demand control typology must be applied (connect a sensor).	To meet the requirements of ErP 2018, a speed controller and local demand control typology must be applied (connect a sensor).	-

Capacity diagram

Selection method:
Air flow:
Pressure:

Operating point

Air flow: --
Pressure: ---

Files archieve

Downloads

Dimensions

Characteristics

Parameter	Value	Measurement unit
∅D	248	mm
B	358	mm
B1	445	mm
H	360	mm
L	658	mm

Additional diagrams

Low speed		Gen.	Octave-frequency band [Hz]								LpA, 3 m dBA	LpA, 1 m dBA
Sound-power level		dBA	63	125	250	500	1000	2000	4000	8000	LpA, 3 m dBA	LpA, 1 m dBA
L_wA to inlet	dBA	66	36	56	63	60	59	43	32	17	45	55
L_wA to outlet	dBA	64	37	42	46	63	55	46	46	30	43	53
L_wA to environment	dBA	55	44	48	51	47	44	37	31	25	34	44

High speed		Gen.	Octave-frequency band [Hz]								LpA, 3 m dBA	LpA, 1 m dBA
Sound-power level		dBA	63	125	250	500	1000	2000	4000	8000	LpA, 3 m dBA	LpA, 1 m dBA
L_wAto inlet	dBA	69	38	59	66	63	62	45	34	18	49	59
L_wAto outlet	dBA	75	43	50	54	74	65	54	54	36	54	64
L_wAto environment	dBA	58	47	49	53	53	49	44	39	31	38	48

ƞ, [%]	MC	EC	N	VSD	kW	A	m³/h	Pa	RPM	SR
30.9	А	static	49.4	No	0.174	0.8	803	236	2505	1

BIM

Designation key

Series	Air duct diameter	Options
VENTS TT Silent-M	100; 125; 150; 160; 200; 250; 315; 355; 400; 450	Т: off-delay timer adjustable from 2 to 30 minutes. U: speed controller with electronic thermostat and temperature sensor integrated into the air duct. Equipped with power cord and IEC C14 electric plug. Temperature-based operation logic. Un: speed controller with electronic thermostat and external temperature sensor fixed on 4 m cable. Equipped with power cord and IEC C14 electric plug. Temperature-based operation logic. U1: speed controller with electronic thermostat and temperature sensor integrated into the air duct. Equipped with power cord and IEC C14 electric plug. Timer-based operation logic. U1n: speed controller with electronic thermostat and external temperature sensor fixed on 4 m cable. Equipped with power cord and IEC C14 electric plug. Timer-based operation logic. R: power cord with IEC C14 electric plug. V: three-position speed switch. P: built-in smooth speed controller and power cord with IEC C14 electric plug.

ErP data
Overall efficiency	ƞ, (%)
Measurement category	MC
Efficiency category	EC
Efficiency grade	N
Variable speed drive	VSD
Power	kW
Current	А
Air flow	m³/h
Static pressure	Pa
Speed	n/min^-1
Specific ratio	SR