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In many production processes, the work area must be exposed to a uniform flow of air or gas over the entire width. Their special design makes tangential fans the optimum solution for these requirements.
The flow-through principle
In a tangential fan, the air is drawn in over the entire length of the fan impeller. Inside the impeller the airflow is diverted and accelerated by the vortex created by the rotation of the impeller. The airstream then exits over the entire length of the impeller on the discharge side. The vortex separates the intake and discharge side of the fan at the narrowest point between the impeller and the vortex builder. Togehter with the fan scroll the vortex directs the airflow. This results in a uniform laminar airflow over the entire width of the fan.
Advantages
 | Uniform, extended airflow over large areas. |
| Space-saving installation due to 90° airflow pattern. |
| Fan length can be matched exactly to machine width. Airflow conditions remain the same even for wider machines (simplified design and drafting in case of modular systems). |
| ans perform well in any mounting position. Drive can be mounted on right or left hand side. |
| Quiet operation due to optimized impeller and housing design. |
| Long life due to the robust design and location of bearings outside the hot air zone. |
| Explosion-proof versions according to ATEX available. |
The complete product range
| Series TA 25/40, GA 25/40 Air/ gas temp.: -40 °F up to +160 °F (-40°C up to +70 °C) Sizes: 4 to 10 in (95 to 300 mm) Airflow: up to 80 cfm (138 m³/h) Stat. pressure: up to 0.12 "wg (30 Pa) |
| Series TA 60 Impeller diameter : 2.4 in (60 mm) Air/ gas temp.: -40 up to +160 °F (-40 up to +70 °C) Sizes: 5.8 to 24.6 in (145 to 615 mm) Airflow: up to 410 cfm (700 m³/h) Stat. pressure: up to 0.4 "wg (100 Pa) |
| Series TAh 60 High corrosion resistance. Impeller diameter: 2.4 in (60 mm) Air/ gas temp.: -40 up to +160 °F (-40 up to +70 °C) Sizes: 5.8 to 24.6 in (145 to 615 mm) Airflow: up to 410 cfm (700 m³/h) Stat. pressure: up to 0.4 "wg (100 Pa) Heating capacity: up to 4.5 kW |
| Series GA 90 180° straight through airflow Impeller diameter: 3.5 in (90 mm) Air/ gas temp.: -40 up to +160 °F (-40 up to +70 °C) Sizes: 16 to 48 in (397 to 1 227 mm) Airflow: up to 950 cfm (1600 m³/h) Stat. pressure: up to 0.18 "wg (45 Pa) |
| Series TA 90, TAt 90 Air/ gas temp.: -40 up to +160 / +250 °F (-40 up to +70 / +120 °C) Sizes: 16 to 48 in (397 to 1 227 mm) Airflow: up to 1 100 cfm (1 860 m³/h) Stat. pressure: up to 0.2 "wg (50 Pa) |
| Series TM 125/150/200, TMt 125/150/200 Impeller diameter: 5/ 6/ 8 in (125/ 150/ 200 mm) Air/ gas temp.: -13 up to +160 / +250 °F (-25 up to +70 / +120°C) Sizes: 16 to 63 in (400 to 1 600 mm) Airflow: up to 4 360/ 8 240 cfm (7 400 / 14 000 m³/h) Stat. pressure: up to 0.55 / 0.76 "wg (135 / 190 Pa) |
| Series TW 125/150/200 Air/ gas temp.: -13 up to +300 °F (-25 up to +120 °C) Sizes: 16 to 63 in (400 to 1 600 mm) Airflow: up to 8300 cfm (14 000 m³/h) Stat. pressure: up to 2.4 "wg (600 Pa) |
| Series TTF 150 Air/ gas temp.: -13 up to +500 °F (-25 up to +250 °C) Sizes: 16 to 50 in (401 to 1 264 mm) Airflow: up to 6500 cfm (11 000 m³/h) Stat. pressure: up to 1.8 "wg (440 Pa) |
| Series VQN/VQH/VQT Impeller diameter: 8 to 39 in (200 to 1 000 mm) Air/ gas temp.: -40 up to +250 / +600 / +1 500 °F (-40 up to +120 / +300 / +800 °C) Sizes: 16 to 180 in (400 to 4 500 mm) Airflow: up to 176 600 cfm (300 000 m³/h) Stat. pressure: up to 12 "wg (3 000 Pa) |
Practical Applications
Designers from all branches of engineering use LTG tangential fans to achieve better product quality and to improve the production process.
Automobile Industry
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Roller test stand
When testing vehicles on test stands it should be done as closely as possible to real-life conditions. This requires the simulation of the airflow produced during driving with the authentic flow on the vehicle's front including the radiator and the car's underside with the exhaust system. The LTG Fahrtwind-Simulators (Fahrtwind = wind generated by a moving vehicle) with built-in tangential fans series VQ perfectly meet these requirements and ensure a uniform laminar flow with best reproducibility. The 90° airflow pattern allows a space-saving arrangement and reduced dimensioning of the entire unit. Specific accessories such as lockable wheels, power height adjustment of the air outlet and a fully electronic operation ensure ergonomic handling.
Packaging Industry
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Plastic bottles
Printed/ varnished parts such as plastic bottles have to be dried and cooled off before further processing. For a consistently good drying result, temperature distribution and airflow must be even over the whole surface of the goods to be dried. The use of tangential fans series TM 150 guarantees the even air distribution over all the goods to be dried. Due to the small dimensions of these fans and the special flow-through principle, which allows a space-saving arrangement of tangential fans and heat exchangers, the overall dimensions for such an installation can be reduced while maintaining the same process space.
Electronics Industry
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Power modules of amplifiers
Power modules of amplifiers as they are used in mobile communication systems, must be cooled evenly for trouble-free operation and long life. To avoid heat accumulation, the emitted heat must be removed from the enclosure. Tangential fans series TA 25, 40, 60 allow for a low height of the enclosure and keep the noise levels to a minimum. Designers gain greater freedom for the layout of modules, since all parts, even the ones on the very side of the enclosure are covered by the even airflow.
Material Testing
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Plastic bumpers
Parts, such as plastic bumpers, are tested in a test cabinet where they are subjected to certain temperature cycles. In order to get a valid comparison of the test results, the various parts in all zones of the test cabinet must be subjected to identical test conditions. Even airflow throughout the test cabinet is essential. Tangential fans offer the ideal solution. They produce an even airflow throughout the cabinet. Also, the 90° turn of the air-stream enables a space saving arrangement of the heat exchangers and therefore a reduced height of the test cabinet.
Drop Forge
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Steel parts
After forging, the red-hot steel parts are annealed with ambient air. To achieve the required hardness and therefore material strength it is essential that air is blown evenly on all parts and that certain annealing curves are adhered to.
Tangential fans series VQ meet these criteria.They produce an absolutely even airflow over the entire work area. Different control zones are easily possible, making preset annealing curves possible without the use of additional devices such as baffels, dampers, plenums, etc.
Heat Treatment Technology
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Ball-bearing races
Steel parts, such as ball-bearing races, are annealed to reduce stress by heating to temperatures of 500°C (950 °F) in a continously running oven. Absolutely even temperature distribution over all parts to be treated is essential. This will ensure the quality of the required hardness, ductility, tenacity and surface finish. Tangential fans series VQ are again the ideal solution, because they produce an even airflow over a long and large area. The discharge length of the fan can be matched to the width of the oven. This makes the airflow pattern inside the oven independent of the width of the oven. In case of modular systems the airflow pattern can be tested on the smallest version, because the pattern remains the same for wider ovens. This greatly simplifies design and drafting work.
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