Frequently asked questions about industrial ventilation and extraction.

Do you have a technical question about an industrial ventilation or extraction system? Here you’ll find answers to the questions we receive most frequently from technical managers, buyers, and manufacturing company owners in Southern Italy. If your question isn’t answered here, contact us directly.

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Information and curiosities

The direction of rotation is defined by looking at the fan from the transmission or motor side. It is distinguished between clockwise rotation (RD) and counterclockwise rotation (LG). Centrifugal fans allow a total of 16 different orientation positions, of which 8 are for clockwise rotation (RD) and 8 for counterclockwise rotation (LG). The standard positions follow angles of 0°, 45°, 90°, 135°, 180°, 225°, 270°, and 315°.

Technical data sheet

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In transmission machines, these letters define the position of the motor in relation to the shaft:

  • Z: engine to the left of the propeller shaft.
  • X and Y: special positions used in case of particular space requirements.
  • W: engine to the right of the propeller shaft.

The basic configuration uses Fe360 (S 235 JR) steel sheet for both the casing and the impeller. All impellers are statically and dynamically balanced to ensure proper, vibration-free operation. For applications involving aggressive chemicals or in the food industry, fans are made of stainless steel. Specifically, AISI 304L is used, which offers good anti-corrosion properties with thermal resistance up to 400°C, or AISI 316L, which is suitable for environments with higher corrosive risk and peak temperatures up to 500°C. For the pneumatic transport of very hard or highly abrasive materials, MZ Aspiratori uses special steels with high surface hardness such as HARDOX 400 or CREUSABRO 4000. These materials are usually applied to the impeller blades and the back of the scroll to slow down the erosive action of the transported fluid.

The standard base color for MZ Aspiratori fans is RAL 5010, gentian blue. The impellers are usually painted with gray or aluminum-colored enamel, while the protective casings are RAL 2002, pure orange, as standard. For stainless steel fans up to size 710, the standard treatment is micro-shot peening. For larger sizes, or for mixed stainless steel and carbon fans, an external coating in RAL 9007 is applied. The standard coating is based on Qualicoat polyester powder, polymerized at 200°C, for an average thickness of 70 microns, with an average thermal resistance of 150°C and peaks of up to 180°C. Two special treatments are available for extreme conditions. HOTBLACK is a matte black silicone coating, suitable for applications up to 450-500°C. DOUBLEZINC includes a double layer, zinc primer plus polyester powder, for a thickness of 110-120 microns, designed for superior anti-corrosion protection.

Products and solutions

In axial fans, air enters and exits along cylindrical surfaces coaxial with the impeller, making them suitable for moving large volumes at low pressure, typically in warehouses and warehouses. In centrifugal fans, air enters the impeller axially and exits perpendicular to its axis, a configuration that generates higher pressures and is therefore suitable for overcoming significant air resistance, such as when transporting fumes, dust, or materials through long ducts. Find a complete in-depth analysis, including comparison tables and use cases, in our guide to centrifugal vs. axial fans: differences and how to choose.

Yes. Our stock includes WEG electric motors in efficiency classes IE3 and IE4 (W21 series in aluminum and W22 in cast iron), Invertek Drives Optidrive E3 frequency converters, CIMI RV series single-phase speed controllers, as well as original accessories and spare parts such as impellers, bearings, and seals.

Yes. It is possible to upgrade or replace just the fan to improve the overall efficiency of the system, subject to a technical compatibility assessment. In these cases, we verify that the new fan reproduces the correct operating point on the characteristic curve of the existing system, thus avoiding the operating point shifting too far to the left or right of the curve, resulting in increased noise and power consumption while maintaining the same performance.

These machines are designed to operate in potentially explosive atmospheres due to the presence of gas, vapors, or combustible dust, in compliance with European Directive 2014/34/EU. Risk zones are classified according to their level of danger. For gas, these are Zone 0 (constant or prolonged presence of an explosive atmosphere), Zone 1 (probable under normal conditions), and Zone 2 (possible only rarely and for short periods). For combustible dust, the equivalent classifications are Zone 20, Zone 21, and Zone 22. Depending on the zone, the fan must fall into a specific category and meet constructional protection criteria against ignition sources. Thanks to our partnership with MZ Aspiratori, we can offer the various categories requested by the customer, from 1G/1D to 3G/3D, with certification issued by TÜV Italia srl ​​guaranteeing compliance with the directive.

We distribute WEG motors in efficiency classes IE3 and IE4, available in the W21 aluminum and W22 cast iron series. Choosing the right motor depends on the type of system, the duty cycle, and the energy efficiency requirements of EU Regulation 327/2011 on the ecodesign of fans, which requires a minimum efficiency level that varies based on the type of impeller and the installed power.

Advanced insights

Parallel installation doubles the flow rate while maintaining constant pressure and is the typical choice when large volumes of air need to be moved. In this case, the fans must be identical and the system must be well-balanced, otherwise the flow rate will be unbalanced between the two branches. Series installation adds the pressures while maintaining a constant flow rate and is ideal for overcoming high resistance. In this case, it is essential that the two fans have the same flow rate, and since their power draws are different, special configurations with dual-shaft motors are often used for high-pressure systems.

The fan must be positioned within minimum distances from fixed barriers to avoid turbulence, backpressure, and performance losses. These distances are expressed as a function of the fan’s internal flange diameter. When the fan is connected to ducts, two additional criteria must also be met: a minimum cross-section equal to that of the fan for a section whose length depends on the duct diameter, and the straightness of the ducts with a constant cross-section for a minimum distance also expressed as a function of the diameter.

The performance declared in the catalog refers to standard conditions, air at +20°C and 0 meters above sea level, with a reference density of 1.205 kg/m³. If the system operates at higher or lower temperatures, or at altitude, the air density changes and with it the actual behavior of the fan. In these cases, the volumetric flow rate remains independent of the temperature, while total pressure, absorbed power, and mass flow rate must be recalculated based on the new density, to avoid undersizing or oversizing the machine.

In addition to the standard polyester powder coating, which has an average thermal resistance of 150°C with peaks of up to 180°C, special coatings are available for more demanding applications, such as matte black silicone coatings for temperatures up to 450-500°C, or a double layer of zinc and polyester paint for greater corrosion resistance. For aggressive environments or those with corrosive agents, AISI 304 or AISI 316 stainless steel constructions or hot-dip galvanizing are available, with some technical limitations related to the size and shape of the impeller.

Sectors and regulations

Yes. In the pharmaceutical and chemical sectors, we manage the extraction of agents in environments requiring safety and emission control in accordance with ATEX regulations. We take into account the area classification (presence of gas or combustible dust) to select the appropriate fan category and electrical components.

We create systems for oven ventilation, pasta and ingredient drying, and storage management, ensuring the hygiene standards required by the industry.

Yes. We provide ventilation and pneumatic conveying systems designed to manage industrial dust and fumes typical of foundries and steelworks, where wear-resistant materials with high surface hardness are often required for the impeller blades and the back of the scroll, or stainless steel constructions when corrosive agents are present.

Yes. We take care of the ventilation of the stables and the extraction of stale air, to ensure animal well-being and correct environmental conditions on the farms.

Process and consultancy

We respond to requests within hours. This is an operational priority, because a broken fan or motor almost always means a production line down, and every hour spent waiting for diagnosis translates into a real cost to the company.

No. The initial technical consultation is free and without obligation. It helps us identify the problem, verify the nameplate data of the affected components (flow rate, static pressure, motor efficiency class), and determine whether it’s a one-off replacement or a more extensive system sizing intervention.

We follow a structured 7-step process.

  1. Technical audit, where we analyze the reported problem and collect data from the existing system.
  2. Feasibility study, in which we verify technical solutions compatible with space, electrical constraints, and applicable regulations (e.g., ATEX for explosion-risk areas).
  3. Configuration, where we select the most suitable fan or motor series, size, and accessories.
  4. Quotation, with a detailed and transparent estimate.
  5. Assembly and testing, with performance verification before shipment.
  6. Dedicated logistics for delivery within the agreed timeframe.
  7. Technical assistance is available upon request, even after installation.

Yes. During the configuration phase, we verify that the fan sizing (flow rate Q, total pressure Ht, rotation speed n) is consistent with the operating point required by the system, and that the combined electric motor complies with the maximum permissible PD2 constraints, to avoid the motor failing to start the impeller or being damaged during start-up.

Support continues even after delivery, with technical assistance upon request, supply of original spare parts (impellers, bearings, seals, electrical components) and submission of compliance documentation, including declarations of incorporation and ATEX certifications where applicable.

Who we are and where we operate

We work primarily with industries in Southern Italy and the islands, including Campania, Puglia, Calabria, Sicily, and Sardinia. Our warehouse in Fisciano allows us to guarantee shorter delivery times than suppliers in Northern Italy, a factor that weighs heavily when a plant is down and every day of waiting has a direct cost on production.

Yes. We have a 1,200 m² warehouse in Fisciano, constantly stocked with MZ Aspiratori centrifugal and axial fans, WEG W21 and W22 series electric motors, Invertek Drives frequency converters, and CIMI components. This allows us to guarantee rapid deliveries, on average within 5-7 business days, without having to wait for custom production.

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