Industrial ventilation

Since 1920 CIRIGLIANO has constantly pursued the continuous improvement from the design to the final production.

Its production plant, located in the city of Junín, has the following areas: administration, die-stamping, fan testing laboratory, model factory, bronze and aluminum die-casting, design room, gray cast iron, electric motor factory, assembly and offices.

In each of them there is a rigorous quality control, achieving highly efficient products and services. Continuous development, initiative, experience and constant improvement is what makes CIRIGLIANO an Argentine industry leader in manufacturing axial, helical, centrifugal and mixed flow fans.

Aerofoil axial fans

With pitch adjustable blades

The construction of an axial flow fan is influenced by several factors prominent amongst which is the design of the blades and their Aerofoil section. This construction increases the performance for the user, with machines of up to 88% of performance. However, a brief explanation of the “Aerofoil” may be useful. An Aerofoil blade section may take a variety of forms but basically it is shown in figure A. It tapers from a comparatively blunt leading edge to a thin trailing edge. The length of the section is referred to as the chord. The shape of the mean line A-A, between the upper and lower surfaces is called the camber, and the angle at which the cross-section is set in relation to the direction of rotation is called the angle of incidence or pitch. All three factors influence performance.

Pressure development is also affected by hub diameter. Generally speaking, fans with relatively large hubs develop higher pressures at the same tip speed than those with smaller hubs, though at some sacrifice of air flow. The purchase price tends to be higher with larger hubs for a given duty. For equal hub and tip diameters and equal speed, pressure development is dependent on total blade area, though a maximum limit is set by mutual interference if the blades overlap too much. The number of blades is not important; a small number of narrow blades is equivalent to a large number of narrow blades, having the same total chord and area.

The pitch angle affects volume. A range of volumes for a given speed and diameter can be provided by different pitch angles. Figure-B illustrates a Construction method that enables a variety of volumes adjusting the pitch angle. This device enables the blades to be set at any angle to give exactly the volume required.

Aerofoil blades

A uniform smelting in the blades allows to achieve the maximum efficiency in the fan with its streamlined profile. The mass includes an insertion in iron where the axis of the engine and the key seat are hold. All blades and the mass of the axis are smelted with “silumin”. The structure of silicon is modified based on sodium at the smelting time.

Extraction system for axial and helical extractors

The exhaust ventilation method is not simply a matter of extracting a certain volume of air per hour. To obtain satisfactory ventilation, the extraction points and natural openings must be arranged in such a way that the fresh air passes through the entire space. Typical examples of good and bad assembly are shown in figures 1 and 2. Where the two side walls of a building give access to the atmosphere, the simplest arrangement is to install the helical fans drawing towards the atmosphere on one wall and provide suitably spaced air inlets on the opposite wall. If only one of the side walls has access to the atmosphere, a possible solution would be to use an extraction pipe along the inner wall as shown in figure 3.

If the distance between the side walls is considerable, it is generally better to proceed with a central extraction. In this way the air path is reduced and the probability of a short circuit decreases. This is sometimes achieved by central exhaust ducting as shown in figure 4, but for single building a simpler solution is to use ceiling mounted extraction units as shown in figure 5. Units of this type, incorporating an helical fan, generally require less capital to install and less cost to run than an overly long duct system. Its effectiveness is aided by upward directed convection currents. Any interference with overhead cranes or similar equipment is also avoided.

Figure 2 illustrates that a building is ventilated in a more homogeneous way by means of several extraction fans, of moderate dimensions, suitably placed, than by a single one of great capacity.

Where heat represents a problem, it is necessary to renew the hot air accumulated in the upper part. If this upper layer of warm air is maintained, it will gradually spread downwards and diminish the natural ventilation of heated air at the working level. In such cases it is customary to extract it from a high level or through the roof or the end of the ridges, while the natural air inlets will be located at a lower level. The faster the top hot air exhaust, the faster heat is removed from the work area and the more easily incoming air is distributed throughout the space.

In some cases where heavy vapors are released into the atmosphere, such as at spray painting sites, it is necessary to locate exhaust fans at ground level. This is done because the fumes are often heavier than air.

Short casing aerofoil axial fans (S)

Aerofoil axial fans are found throughout the world as the most used fans and are well known for its operating safety and exceptional performance. The range of products and the wide variety of sizes and types allow uncountable applications in ventilation, air conditioning, heating, cooling, and drying systems. There are ten sizes available, from 300 mm to 2410 mm diameter. The range of performance covers air volumes from 350 to 250.000 m3 per hour, with a maxium water pressure of 500 mm. The application of an adjustable pitch patented impeller allows all wished combinations of volume and pressure. The simple design offers direct ventilation, facilitates installation and saves space. Cirigliano S.A. offers fans for damp, higher temperatures or explosive atmospheres.

LONG CASING AEROFOIL SINGLE-STAGE FANS (L) INDIRECT COUPLING

Aerofoil fans for general applications have no guide vanes. The impeller rotates inside a cylindrical carcass and is mounted directly on the axis of the impeller motor. Two types of carcasses are available. Ten types of fan sizes are supplied, from 300mm to 2410mm, with short type S envelopes covering only the impeller, as illustrated in the above figure. This type or carcass is usually used for coupling at the end of a ventilation system. In addition, eight types of sizes may be supplied from 300 to 1520mm diameter, with long type L carcasses covering the full longitude of the impeller and motor. These are designed for air conduction. Type L envelope has an external terminal box and two register doors.

TWO - STAGE AND MULTI - STAGE FANS

The use of contra-rotative units allow to obtain substantial pressure rise. The system consists in two or more impellers with opposite handed wings rotating in opposed directions. The wings rotate in the opposed direction and are coupled directly to the motors. The number of stages may be 2, 3, 4, 5 or 6. The pressures developed will be respectively of 3, 4, 6, 7 or 9 times higher than that developed by any single stage non-guide vane fan. Two-stage fans up to 1220 mm are generally supplied with the two-stages contra-rotative units in one casing, as variant, single stage units can be used coupled in series rotating in the opposed direction.

BIFURCATED FANS

Aerofoil fans can also be supplied with isolated motors from air current and are used to re-circulate air with a maximum temperature of 80 C, as well as to ventilate damp atmospheres, smoke or dust. Under requirement we can supply fans able to run at a maximum temperature of 205 C. The design is usually similar to the ordinary single-stage fans, but the motor is isolated in a roller from environment. Four sizes are offered: 380, 480, 610 and 760 mm diameter. The motor has an air inlet from the non-polluted environment used for cooling.

MAIN AND AUXILIARY MINE FANS

For auxiliary ventilation in mining and boring work on tunnels, Cirigliano offers aerofoil two-stage contra-rotative and single-stage fans. The compact design takes up very little space and allows direct coupling to the duct and the light weight allows hanging it in the tunnel wall. A small range of single-stage and two-stage fans will supply the means to face wide variety of pressures. Moreover, there are fans which are resistant to the explosions to work in flammable atmospheres of mines. From 300 to 1500 mm diameter in 50 and 60 hz. Appropriate for mounting as of 4500 mt above sea level.

CLOSED CIRCUIT FANS

A closed circuit Aerofoil fan is designed for recirculating air in an enclosed chamber with the motor outside in ambient atmosphere. It is particularly suitable for drying machines and refrigerating rooms, and so on. It is used for removing air up to a maximum temperature of 205 C. The fan is carried off a circular mounting plate which is bolted over a hole in the chamber roof where is going to be installed. The motor is placed on the external side of the mounting plate.

MAXCESS MARINE FANS

Designed for ship ventilation, Cirigliano's Maxcess design allows to extract the fan from the duct system, for its service, without taking part in installations or electric connections. The fan is mounted with hinges in a protective case which is connected with the duct system. Joints between the fan and the protective case are hermetically sealed. Current taps are connected to a terminal case placed at the external side of the protective fan case. There are also external lubricators. In recent years, a great number of ships built in many countries have MAXCESS fans.

FUME HANDLING FANS

Corrosion resistant Aerofoil axial fans can be supplied for fume extraction systems. The impellers are moulded in glass fibre and the outside casing in strengthen plastic. The motor and mountings are protected by a sealing coating compound resistant to corrosion. The plastic is resistant and is relatively light in weight. Four sizes of fume handling Aerofoil fans are offered: 300, 380, 480 and 600 mm diameter. The performance characteristics are the same as for standard aerofoil fans and may be converted into single-stage for high pressures

FUME CUPBOARD FANS

There are a range of fans for fume cupboards from laboratories and other types of fume systems that require small fans. Cirigliano offers fume cupboard fans resistant to corrosion. The outside of the casing is moulded with polyvinyl chloride. The impellers are moulded in plastic and the motor and accessories are hermetically sealed with a compound resistant to the corrosion. There are plastic connections that join the fans to the pipe system. There are four sizes available: 150, 190,240 and 300 mm diameter. Performance variation includes the movement of air volumes from 250 to 2.000 m3 per hour.

VARFOIL AXIAL FANS - ADJUSTABLE PITCH IN MOTION

Particularly designed for water cooling towers and chemical industries where the temperature regulation of liquids is critical. It has vanes whose angles of inclination may vary during the running of the fan. Thus, it supplies different volumes as the liquid may require for cooling.This system offers great advantages since the control is extremely accurate and superior to that obtained by fans with adjustable speed motors. A pneumatic mechanism modifies the angle of the vanes through a thermocouple or thermostat. The variation of the angle may be adjusted in the way the system requires it. Four models are offered:1.220, 1.520, 1.900 and 2.410 mm diameter.

FOR ROOF EXTRACT VENTILATION, CIRIGLIANO’S UNITS DROVE BY FANS HAVE A HIGHER PERFORMANCE THAN STANDARD FANS. EXTRACTION SPEED IS POSITIVE AND DOES NOT VARY WITH WEATHER CONDITIONS AS HAPPENS IN STANDARD CROWLS FANS. EXTRACT CAPACITY HAS BEEN DETERMINED BY TESTS PERFORMED IN ACCORDANCE WITH INTERNATIONAL RULES. THE UNITS ARE MANUFACTURED TO PROVIDE MANY YEARS OF SERVICES WITHOUT PROBLEMS.

A-SERIES UNITS

Sizes 300/1220 mm Flow rates 1700/46500 m³/h. Designed for minimal airflow restriction, provided with a wide protective hood.
This root unit design guarantees no wind pressure problems. Three-phase 220/380 v - 50 c.

B-SERIES UNITS

These units are supplied for flat or inclined roofs. There are seven sizes available in which fans vary between 300 and 1220 mm diameter. Extracting capacities vary from 1020 to 40800 m per hour. Automatic locking may be coupled to reduce heat loss. The motors of the fans may be placed in such a way that may be possible to lubricate from above or below the roof. It is made of welded steel and hot galvanised.

VERTICAL JET UNITS

These units supply a high speed vertical flow, expelling the extracted air to a considerable height over the roof. These units are suitable for dissipation of polluted air, steam or smoke. When there is no admission resistance they are supplied with propeller fans for direct roof extract. But, in case these units constitute the final element of a duct extract system they are supplied with aerofoil fans. There are seven sizes available: from 300 up to 1220mm diameter. Exhaust capacities vary from 1530 to 39.100 m3 per hour. There is an automatic locking for environment protection. The outlet is protected with a fiber glass screen against environment.

LOW SILHOUETTE UNITS

These units are aerodynamical and have a discrete design and low aluminum hood. Very popular in buildings where appearance is extremely important. Six sizes available: from 300 to 900 mm diameter. It can be coupled to propeller or aerofoil fans. Propeller extract capacity varies from 950 to 20.740 m3 per hour.

SERIE E EXTRACT UNITS

Serie E roof extract units are designed primarily for agricultural buildings. Low price. Easy installation. Available in four sizes from 300, 380, 460 and 600 mm diameter. Extract capacity varies from 1020 to 9350 m3 per hour. An automatic locking can be coupled to avoid downward flows. Manufactured in hot galvanised steel.

LMF UNITS

Mixed volume available in 5 sizes.
Galvanized steel units
Aluminum impeller
Range of running: from 972 to 19080 m3 per hour. Direct drive with single and tripe-phase motors.

SERIES C UNITS

Axial flow
There are 7 fans available for volumes ranging from 1020 to 47500 m3 per hour. Cheap and long life units-durability
Strong construction
Galvanised steel unit

MIXED FLOW UNITS

A new and wide range of roof extract mixed flow units has been incorporated offering the best features of centrifugal and propeller fans. The mixed flow impeller has an extraordinary design with excellent pressure features and low sound level, exempt from bothering noises. AX017 It is also convenient for roof direct extract or as a final element of extract systems that require pressures of 25 mm of water or more. These units are manufactured in light weight plastic. Short in height and aerodynamic profile. Capacity varies from 950 to 19.720 m3 per hour.

The manufacturing range covers models with a diameter from 190 to 1,220 mm and with flows from 460 to 53,550 m3/h free discharge. The quality of Cirigliano helical fans recognized throughout the world carries squirrel cage induction motors whose features meet all the requirements of international standards as described in our brochure.

With crown and protection

The 190 and 230mm Cirigliano helical fans are mounted on a combined crown and protective grill assembly made from an aluminum alloy. The mounting holes in the mounting crown are provided with rubber sleeves to reduce noise transmission. The 230mm model has a terminal box on the mounting crown and the 190mm fan is fitted with a 46cm lead coming from the motor.

Mounted on crowns

Fans from 300 to 1220mm diameter are usually supplied with pressed steel mounting crowns. A special feature is the elastic suspension of the impeller and engine. In order to reduce noise transmission, the mounting arms of the fans, up to a size of 920 mm in diameter, are supported on rubber cushions. These fans can be fitted with explosion-proof motors and special motors for humid places and high temperatures.

Mounted without crowns

When it is required to attach the fans to customer appliances or it is desired to install them in air ducts, the fans can be supplied without the mounting crowns. All sizes, except the 1220 mm diameter, are fitted with the Cirigliano elastic suspension. Mounting cross plates can also be supplied.

Blind shutters

Louver shutters are opened by the fan current and close when the fan stops. They decrease fan performance by approximately 15% and should not be used with low speed fans. They are also not recommended when the air speed exceeds 5 or 6 mt/sec. due to its lightweight construction. The shutters are made of aluminum and are mounted on a steel frame with four support legs. Finish: glossy gray.

Throttle and windshield Registry

The throttle registers exclude reversible currents with a fan performance loss of only 5%. Las aletas del obturador se abren por la corriente del ventilador y se cierran cuando éste se para. Rubber pads prevent rattling noise. Shutters exposed to high winds must have the windshield shown attached. This windshield will reduce performance by another 20%. Finish: Gloss gray shutter, galvanized windscreen.

Wall hood

To protect the outlets of fans placed in exposed locations, these pipes prevent strong winds from reducing fan performance from opposing winds. They reduce the air flow by approximately 10%. Mild steel construction with welded seams and square locking flanges. Finish: Galvanized.

Chambers for fans

These chambers are perfectly proportioned casings for mounting fans in ducts. Its design allows the radial flow of air to and from the tips of the blades. Provided with a diaphragm plate to support the fan, the chamber has square mounting flanges on both sides and is provided with an external terminal box and two service doors. For explosion-proof fans, the terminal box is not attached. Finish: Galvanized.

Low Loss Grids

Elegant screens for air inlets or outlets, these grilles offer little resistance to airflow. Although they do not allow direct vision through the opening, they have a free area of 60%. They have a square shape with a perforated frame for fixing. Finish: Bright Grey.

Diaphragm plates

For supporting diaphragm mounted fans when used in ductwork or in heaters, coolers etc. Its size is in relation to the diameter of the blades and it has the air flow at the tips of the blades, guaranteeing the performance of the fan. With holes for the fan arms and their fixing. Finish: oxidized. Brilliant gray over antirust minium primer.

SMALL AEROFOIL FANS

We offer five types of small aerofoil fans for cooling electronics devices and for other jobs that require small fans. The five types are produced in five sizes: 96, 120, 150, 190 and 240 mm in diameter. A specific brochure with working curves is available.

SPECIAL FILTERING UNITS

Injection and extraction with filtrate for industrial plants. These units are used in industrial plants for air injection and extraction where fluid filtering is important. It consists of axial fans with washable and interchangeable filters and fixed shutters to prevent water from entering. Continuous service equipment to work outdoors. Sizes from 300 mm to 1,200 mm and flows from 1,000 m3/h to 100,000 m3/h.

AEROFOIL FANS

Aerofoil fans with KG guide vane and without KL guide vane are of the long box type, and are manufactured in three diameters: 150mm, 190mm, and 240mm. All castings, motor casing and guide fins are made of aluminum alloy. Flows from 400m³/h to 5000m³/h with pressures from 0 to 50mm CA according to the rotation speed.

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