Side channel blower type MD
One impeller, two-stage – up to 521 m³/h
In the MD type, the air passes through two compression channels one after the other. One impeller, two stages: this allows the blower to reach significantly higher pressures and vacuums than a single-stage machine.
With up to 650 mbar pressure and 450 mbar vacuum, it is suitable for applications with high resistance, such as deep basins or long pipes.
Flow rate
up to 521 m³/h
Pressure
up to 650 mbar
Vacuum
up to 450 mbar
Motor power
0.55 to 15 kW
Why type MD?
Where a single-stage blower reaches its pressure limit, the MD type is still working in the safe range. This protects the machine and keeps the air temperature low.
The series starts with the small 15DH with 0.55 kW. Sizes e07 to e12 belong to the EVO generation with the Smartwave™ impeller.
- Oil-free: the air only comes into contact with the impeller, not with lubricants
- Direct drive: the impeller sits on the motor shaft, without belts or gearbox
- Non-contact and low-wear: apart from the bearings, there are no parts that wear
- Built for continuous operation: IE3 motors, IP55 protection, insulation class F
- Pressure or vacuum with the same machine
- Light, robust die-cast aluminium housing
Typical applications
Deep basins
Aeration of basins with great water depth, where the back pressure is high.
Vacuum clamping tables
Holding panels and workpieces in wood, plastic and stone processing.
Long conveying lines
Pneumatic conveying over longer distances.
Medical and laboratory
Compact vacuum and pressure generators for devices.
Technical data
| Model | Max. flow rate [m³/h] | Max. pressure [mbar] | Max. vacuum [mbar] | Motor [kW] |
|---|---|---|---|---|
| 15DH MD | 50 | 300 | 275 | 0,55 |
| R20 MD | 60 | 400 | 300 | 0,75 – 1,1 |
| R30 MD | 91 | 425 | 350 | 1,1 – 1,5 |
| R40 MD | 117 | 500 | 350 | 2,2 – 3 |
| e07 MD | 209 | 650 | 450 | 3 – 5,5 |
| e08 MD | 255 | 650 | 450 | 4 – 7,5 |
| e09 MD | 325 | 600 | 400 | 5,5 – 7,5 |
| e10 MD | 395 | 650 | 400 | 7,5 – 9,2 |
| e11 MD | 458 | 650 | 400 | 7,5 – 11 |
| e12 MD | 521 | 650 | 400 | 9,2 – 15 |
Values at 50 Hz according to the FPZ catalogue. The motor power depends on the operating point; at 60 Hz, flow rate and power are higher. We will be happy to size the right model for your operating point.
Frequently asked questions
When do I need a two-stage blower?
When the required pressure is above around 400 mbar or the vacuum above around 300 mbar. There, a single-stage blower is working at its limit, while the MD type still has reserves.
Can the same blower generate pressure and vacuum?
Yes. A side channel blower blows on the pressure side and sucks on the suction side. Whether you use it as a blower or a vacuum generator depends only on which side you connect. The achievable values differ; see the table.
Do the values also apply at 60 Hz or with a frequency inverter?
The table shows the values at 50 Hz. At 60 Hz or with a frequency inverter, flow rate and power increase; this also allows the blower to be controlled precisely to demand. The 60 Hz values are in the catalogue.
Which accessories do I need?
At least an inlet filter and a pressure or vacuum relief valve that protects the blower against overload. Depending on the system, silencers, a check valve, a pressure gauge and an acoustic enclosure are added. Everything fits together and comes from a single source – us; see Accessories.
How much maintenance does a side channel blower need?
Very little. The impeller runs without contact, and there is neither oil nor belt. The main things to check are the inlet filter and, after many operating hours, the bearings. On request, we take care of maintenance and repair for you.
Downloads
Which blower suits your application?
Flow rate, pressure or vacuum, the conveyed medium and the operating times determine which series and size are right. We size the blower with you, supply the matching accessories and take care of installation and service.