Industrial Blowers: A Complete Guide to Selection, Comparison of Types and Specifications
In modern industry, the right decision on choosing the type of blower directly affects energy efficiency and product cost. LET Company offers a comprehensive approach: from rotary and screw to centrifugal and vacuum systems of any capacity.
Whether you need a compact vortex blower for aeration or a powerful two-stage system for pneumatic conveying, our experts will help you select optimal equipment with a guarantee of up to 35% electricity savings.
Comparison table: which type of blower to choose?
Before buying an industrial blower, it is important to understand the key differences between equipment types. Below is a detailed comparison:
| Parameter | Rotary | Screw | Centrifugal | Vortex |
|---|---|---|---|---|
| Capacity | 30-2500 m³/h | 100-12000 m³/h | 1000-40000 m³/h | 30-2200 m³/h |
| Pressure (gauge) | 300-1000 mBar | 300-1000 mBar | 100-1100 mBar | 40-1040 mBar |
| Vacuum depth | up to -500 mBar | up to -600 mBar | up to -500 mBar | up to -730 mBar |
| Motor power | 0.75-350 kW | 18-250 kW | 15-800 kW | 0.12-25 kW |
| Noise level | 75-95 dB(A) | 65-80 dB(A) | up to 80 dB(A) | 55-75 dB(A) |
| Oil-free | ✓ 100% | ✓ 100% | ✓ 100% | ✓ 100% |
| Energy efficiency | Medium | High (with VFD) | Very high | Medium |
| Price (approximate) | from 517,000 ₽ | from 850,000 ₽ | from 1,200,000 ₽ | from 55,000 ₽ |
Rotary blowers (Roots): design and application
Rotary (rotational) blowers of the Roots type are positive displacement machines with two figure-eight rotors rotating synchronously towards each other. This is a time-tested technology that ensures stable performance over a wide pressure range.
Design features of rotary blowers
- Operating principle: air capture in pockets between the rotors and housing with subsequent discharge into the pressure pipeline
- Direct drive: rotor synchronization is carried out through a gear transmission without contact between the rotors themselves
- Oil-free compression: the working chamber does not require lubrication, ensuring 100% air flow purity
- Reversibility: ability to operate both for pressure and vacuum (up to -500 mBar)
LET Expert Opinion:
Rotary blowers are optimal for systems that require stable flow at variable pressure. They are ideal for aeration of wastewater treatment plants and pneumatic conveying of bulk materials.
Technical specifications of rotary blowers
| Parameter | Range | Application |
|---|---|---|
| Capacity | 30-2760 m³/h | From small installations to large aeration systems |
| Pressure | 300-1000 mBar | Pneumatic conveying, aeration, gas blowers |
| Power | 0.75-350 kW | Selection for any industrial tasks |
Screw blowers: high efficiency for large flows
Screw (helical) blowers are a modern solution for industrial enterprises with high energy efficiency requirements. The screw block with synchronously rotating rotors ensures smooth air delivery without pulsations.
Advantages of screw systems
- Energy saving: equipment with variable frequency drives allows saving up to 35% of electricity
- Low noise level: 65-80 dB(A) – one of the quietest among industrial compressors
- High capacity: up to 12000 m³/h in a compact size
- Continuous operation: design is rated for 24/7/365 operation
- Wide control range: smooth capacity adjustment from 25% to 100%
Applications of screw blowers
Screw compressor-blowers are actively used in:
- Aeration systems for large wastewater treatment plants and RAS ponds
- Pneumatic conveying of grain, cement, flour, granules
- Technological processes in chemical and food industries
- Vacuum packaging and forming systems
Centrifugal (turbine) blowers: power for mega-projects
Centrifugal blowers are dynamic machines that create pressure through the kinetic energy of a rapidly rotating impeller. This is the choice for enterprises with huge air requirements.
Unique characteristics of centrifugal blowers
| Characteristic | Value |
|---|---|
| Capacity | 1000-40000 m³/h |
| Pressure | up to 1.1 bar (1100 mBar) |
| Motor power | 15-800 kW |
| Efficiency | up to 85% (highest among all types) |
| Noise level | up to 80 dB(A) at 1 meter distance |
Vacuum blowers: specialized solutions
Vacuum blowers are specialized equipment for creating vacuum in technological processes. In essence, these are the same rotary, screw or vortex blowers, but optimized for vacuum operation.
Vacuum system applications
- Vacuum gripping: lifting and moving sheet materials (glass, metal, cardboard)
- Packaging: thermoforming, vacuum packaging of products
- Dust extraction: removal of dust, chips, biomaterials in dentistry and laboratories
- Degassing: removal of air from liquids and melts
- Vacuum drying: removal of moisture from porous materials
Technical parameters of vacuum blowers
| Type | Vacuum depth | Capacity |
|---|---|---|
| Vortex | up to -730 mBar | 30-2200 m³/h |
| Rotary (Roots) | up to -500 mBar | 100-2500 m³/h |
| Screw | up to -600 mBar | 200-5000 m³/h |
Two-stage blowers: maximum pressure and vacuum
Two-stage (two-cascade) blowers are a system of two sequentially connected working chambers, which allows achieving significantly higher pressure and vacuum indicators compared to single-stage analogs.
Operating principle of two-stage systems
Air passes sequentially through two working chambers:
- First stage: preliminary compression (or evacuation) to intermediate pressure
- Second stage: final compression to required parameters
- Intermediate cooling: between stages (optional) to increase efficiency
Advantages of two-stage design
- ✓ High pressure: up to 1040 mBar (versus 400-500 mBar for single-stage)
- ✓ Deep vacuum: up to -730 mBar
- ✓ Increased efficiency: reduced friction and heating losses
- ✓ Versatility: one unit covers a wide range of tasks
Popular models of two-stage blowers
| Model | Capacity | Pressure/Vacuum | Power | Price* |
|---|---|---|---|---|
| 2RB 420 Compact |
85-130 m³/h | ±400/380 mBar | 2.2 kW | from 95,000 ₽ |
| 2RB 720 Industrial |
320-420 m³/h | ±550/500 mBar | 5.5 kW | from 185,000 ₽ |
| 2RB 820 High-performance |
550-720 m³/h | ±650/580 mBar | 11 kW | from 320,000 ₽ |
* Prices are for standard configuration. Exact cost depends on configuration and current exchange rate.
Industrial blower: selection criteria for your production
Choosing an industrial blower is a complex task that requires consideration of many factors. LET Company has developed a step-by-step selection algorithm:
Step 1: Determining required parameters
- Air flow (m³/h): calculate total demand of all consumers
- Operating pressure (mBar): account for losses in pipelines, filters, valves
- Operating mode: continuous (24/7) or periodic
- Air quality: is 100% oil-free flow required
Step 2: Choosing blower type by application
Application matrix:
| Industry | Recommended type | Reasoning |
|---|---|---|
| Water aeration, RAS | Rotary, Vortex | 100% oil-free, reliability |
| Pneumatic conveying | Rotary, Screw | Stable pressure, high flow |
| Food industry | Screw, Centrifugal | Energy efficiency, low noise |
| Packaging, printing | Vortex (two-stage) | Deep vacuum, compactness |
| Large wastewater treatment plants | Centrifugal | Huge capacity, efficiency |
Step 3: Accounting for correction factors
Nameplate characteristics are specified for normal conditions (20°C, 1013 mBar, 0 m altitude). When deviating from these parameters, corrections must be made:
- Temperature: as temperature increases, air density decreases, which reduces generated pressure
- Altitude above sea level: every 1000 m of altitude reduces pressure by approximately 10%
- Humidity: when working with humid air, installation of condensate separators is required
Compressor-blower: what’s the difference?
A common question arises: what is the difference between a compressor and a blower? The main difference is in the generated pressure:
- Blowers: operate in the range up to 1 bar (1000 mBar) gauge pressure
- Compressors: create pressure above 1 bar (up to 10-15 bar and higher)
However, the boundary is blurred: many modern screw and centrifugal machines can operate in both modes, and the term “compressor-blower” is quite justified.
Approximate cost of industrial blowers
Below are approximate prices for main types of industrial equipment. Exact cost depends on manufacturer (VARP, Becker, Aerzen, FPZ, Atlas Copco), configuration and current exchange rate.
| Equipment type | Power | Capacity | Price (from) |
|---|---|---|---|
| Vortex (single-stage) | 0.75-3 kW | 50-200 m³/h | 55,000 ₽ |
| Vortex (two-stage) | 2.2-11 kW | 85-720 m³/h | 95,000 ₽ |
| Rotary (Roots) | 3-75 kW | 200-1500 m³/h | 517,000 ₽ |
| Screw | 18-100 kW | 300-3000 m³/h | 850,000 ₽ |
| Centrifugal | 30-400 kW | 2000-10000 m³/h | 1,200,000 ₽ |
What affects the final equipment cost?
When forming a commercial proposal, our specialists take into account:
- Material of construction: standard aluminum, cast iron or stainless steel (for food production and aggressive environments)
- Additional piping: inlet filters, silencers, check valves, safety valves
- Control system: basic panel, PLC with automation, remote monitoring
- Variable frequency drive: for smooth control and energy saving
- Manufacturer brand: European (Becker, Aerzen, Atlas Copco) or Asian (VARP, Hsien Feng) brands
Applications of industrial blowers
Industrial blowers are used in dozens of industries. Here are the most common:
Water treatment and aeration
- Aeration of ponds, lakes, wastewater treatment plants
- Recirculating aquaculture systems (RAS) for fish farming
- Biological wastewater treatment
- Water oxygenation without oil emulsion contamination
Pneumatic conveying
- Moving grain, flour, compound feed
- Transport of cement, lime, gypsum
- Supply of plastic granules, powders
- Gentle transport of fragile materials
Packaging and printing
- Vacuum gripping of cardboard sheets, film, glass
- Packaging thermoforming
- Vacuum packaging of food products
- Labeling, marking
Industrial production
- Air supply for burners, furnaces
- Pneumatic automation
- Product cooling and drying
- Dust extraction and removal
Medicine and laboratories
- Central aspiration systems in dentistry
- Vacuum drying cabinets
- Laboratory vacuum systems
- Medical ventilation
Why choose LET Company?
✅ Official warranty
From 12 to 24 months on all types of blowers. Service maintenance throughout the entire service life.
✅ Certified equipment
All products have declarations of conformity TR TS 010/2011 “On safety of machinery and equipment”.
✅ Own warehouse in Moscow
Popular models always in stock. Shipment on the day of payment. Delivery throughout Russia.
✅ Engineering selection
Free calculation of your pneumatic system within 2 hours. Consideration of all nuances and correction factors.
✅ Commissioning and training
Consultations on installation, piping, variable frequency drive connection. Personnel training.
✅ Flexible payment terms
Work with VAT, deferred payment for regular customers, installment plans.
How to order an industrial blower from LET Company
The selection and purchase process is maximally simplified:
- Application: submit a request on the website or call +7 (495) 232-00-66
- Consultation: an engineer will contact you within 15 minutes to clarify parameters
- Calculation: we will prepare a commercial proposal with 2-3 optimal options within 2 hours
- Coordination: we will discuss details, make adjustments if necessary
- Payment and delivery: shipment from Moscow warehouse on the day of payment or at agreed times
- Commissioning: consultations on installation and connection (specialist visit by agreement)
Ready to select the optimal blower for your production?
Get a free engineer consultation and commercial proposal within 2 hours
Trust selection to professionals
An industrial blower is an investment for 10-20 years. A mistake in choosing the type or power will lead to overpayments for electricity, production downtime and premature equipment wear.
LET Company engineers have many years of experience in selecting blowers for enterprises in various industries: from small RAS farms to large cement plants. We know how to find the balance between performance, reliability and price.
Do not risk production efficiency – contact professionals!
📞 Contact information:
☎ Phone: +7 (495) 232-00-66
✉ Email: let@eca.ru
Submit a request right now, and our engineer will contact you within 15 minutes for a free consultation and equipment selection for your tasks.