AIRTECHZ · DUCT VENTILATION
Centrifugal Inline Duct Fan
Galvanized steel construction for ducted air supply and extraction. The KD series combines a centrifugal impeller with an AC motor in a compact circular housing.
100–315 mm duct sizes · Up to 1,650 m³/h · Gray and black finishes
Gray & Black Product Views
Built for Ducted Airflow
Installed between sections of ductwork, this centrifugal inline fan supplies fresh air or extracts stale, humid air. Its impeller develops pressure to move air through ducts, bends and terminal grilles. Select a model using the required airflow and the system pressure loss.
The fan improves air exchange and circulation; it does not refrigerate or cool the air itself.
Construction & Main Components
- Galvanized steel housing: a robust metal enclosure with corrosion resistance for general ventilation.
- AC motor: external rotor motor with ball bearings and thermal protection.
- Centrifugal impeller: metal construction available; the technical documentation also lists a PA66 option. Confirm the impeller material for your selected model.
- Mounting bracket and junction box: support installation and electrical connection.
- Color options: gray and black; other finishes can be discussed.
Technical Specifications
Maximum airflow values are reference ratings. Actual airflow depends on duct resistance. Match voltage and frequency to the installation supply; S1 and S2 are different electrical variants.
115/120 V · 60 Hz · S1 Models
| Model / duct Ø mm | Max. airflow m³/h | Speed rpm | Power W | Noise dB(A) |
|---|---|---|---|---|
| KD100S1 / 100 | 300 | 2600 | 88 | 61 |
| KD125S1 / 125 | 400 | 2480 | 88 | 61 |
| KD150S1 / 150 | 600 | 2500 | 128 | 65 |
| KD160S1 / 160 | 650 | 2520 | 130 | 65 |
| KD200S1 / 200 | 950 | 2550 | 215 | 67 |
| KD250S1 / 250 | 1050 | 2600 | 220 | 68 |
| KD300S1 / 300 | 1500 | 2800 | 330 | 70 |
| KD315S1 / 315 | 1650 | 2800 | 325 | 70 |
220/230 V · 50 Hz · S2 Models
| Model / duct Ø mm | Max. airflow m³/h | Speed rpm | Power W | Noise dB(A) |
|---|---|---|---|---|
| KD100S2 / 100 | 260 | 2300 | 66 | 58 |
| KD125S2 / 125 | 360 | 2250 | 73 | 58 |
| KD150S2 / 150 | 550 | 2400 | 90 | 60 |
| KD160S2 / 160 | 600 | 2250 | 105 | 63 |
| KD200S2 / 200 | 900 | 2300 | 175 | 63 |
| KD250S2 / 250 | 1000 | 2350 | 155 | 63 |
| KD300S2 / 300 | 1400 | 2500 | 210 | 68 |
| KD315S2 / 315 | 1600 | 2400 | 205 | 68 |
220/230 V · 60 Hz · S2 Models
| Model / duct Ø mm | Max. airflow m³/h | Speed rpm | Power W | Noise dB(A) |
|---|---|---|---|---|
| KD100S2 / 100 | 300 | 2400 | 86 | 61 |
| KD125S2 / 125 | 400 | 2350 | 85 | 61 |
| KD150S2 / 150 | 600 | 2500 | 118 | 65 |
| KD160S2 / 160 | 650 | 2350 | 130 | 65 |
| KD200S2 / 200 | 950 | 2450 | 212 | 67 |
| KD250S2 / 250 | 1050 | 2400 | 210 | 68 |
| KD300S2 / 300 | 1500 | 2600 | 285 | 70 |
| KD315S2 / 315 | 1650 | 2550 | 260 | 70 |
Noise values follow the supplied datasheet; measurement distance and test conditions are not stated. Ask for the complete electrical specifications, including current and capacitor value, when confirming a model.
Motor & Operating Conditions
- Motor type: YWF-68L external rotor AC motor.
- Protection: IP44; ball bearings and thermal protection.
- Operating range: −25°C to +60°C; 0–90% RH as stated in the technical notes. Confirm suitability for the actual installation.
- Insulation: B, F or H options listed; confirm the supplied configuration.
- Electrical options: the notes list a 207–253 V supply range for the nominal 230 V version. Other voltage and frequency requirements can be discussed.
Performance Curves & Installation Dimensions
Select a duct size below to view its performance curve, installation dimensions and model data. Click a drawing to enlarge it. Use the curve corresponding to the selected voltage and frequency when checking your required duty point.
The PDF includes performance curves and dimension drawings for duct sizes 100, 125, 150, 160, 200, 250, 300 and 315 mm, together with model specifications and motor notes. View the PDF in a new tab.
Applications
- Bathrooms and toilets: extract moisture and odors.
- Offices, shops and restaurants: general air supply and extraction.
- Storage rooms and basements: remove stale air and help limit humidity buildup.
- Duct systems: support airflow where bends, grilles or filters increase resistance.
For grease-laden kitchen exhaust, corrosive fumes or hazardous atmospheres, confirm a purpose-designed fan and the applicable installation requirements.
Centrifugal vs. Mixed-Flow Inline Fans
A centrifugal inline fan uses a centrifugal impeller, while a mixed-flow fan combines axial and radial flow characteristics. A mixed-flow fan is not simply an axial fan.
Metal housings offer mechanical rigidity; ABS or PP housings offer lower weight and resistance to rust. For longer ducts or systems with bends and filters, compare the actual fan curves at the required airflow and pressure. Impeller type alone does not determine which model performs better.
Centrifugal Inline Duct Fan FAQs
How do I choose the correct duct fan?
Match the duct diameter, supply voltage and frequency first. Then use the performance curve to select a model that delivers your required airflow at the system’s static pressure. Duct length, bends, grilles and filters all affect the operating point.
Does the rated maximum airflow equal the installed airflow?
No. Maximum airflow is a reference rating. The airflow achieved after installation depends on system resistance, so compare the fan curve with the required duty point rather than selecting on maximum airflow alone.
Which duct sizes and power supplies are available?
The KD series covers 100, 125, 150, 160, 200, 250, 300 and 315 mm duct connections. The specifications list S1 models at 115/120 V, 60 Hz and S2 models at 220/230 V, 50 or 60 Hz. Confirm the exact electrical variant before ordering.
Is the impeller always made of metal?
The technical notes list galvanized sheet steel and PA66 impeller options. Confirm the material for the selected model and order; a metal housing does not by itself identify the impeller material.
Where can I find the performance curves and dimensions?
Open the section for your duct size under Performance Curves & Installation Dimensions. Each drawing can be enlarged, and the complete AIRTECHZ PDF is available below the drawings.
Choose the Right KD Model
Send your duct diameter, required airflow, estimated static pressure or duct layout, voltage/frequency, quantity and destination. We can help compare the available models and confirm the impeller material, finish and electrical configuration.