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FANS & BLOWERS |
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SYSTEMS |
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LITERATURE |
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![]() Centrifugal blowers develop high pressure-to-volume performance at low rotational speeds for quiet cooling of tightly packaged electronic equipment under severe environmental conditions in airborne, ground based, and shipboard applications. Simplex blowers have 1 squirrel cage impeller wheel while Duplex blowers have 2 squirrel cage impeller wheels mounted on a common shaft - both are available for either clockwise or counterclockwise rotation. Duplex blowers simplify ductwork and allow greater volume performance in tight locations. As with all squirrel cage blowers, air enters axially and exits tangentially, making a 90 degree turn. All models are built to applicable military specifications.
Brushless DC Operation and Frequency Converters
Centrifugal Blowers are available for single or multiple operations from DC power sources. Rotron also provides Frequency Converters to allow higher or lower motor speeds, where required, than are possible with a 50/60 or 400 Hz sources. Converters are also available to operate single or multiple units.
Performance Sensors
All Models equipped with optional performance sensors send out a tachometer-type signal generated from a hall sensor activated by a small permanent magnet mounted on the rotor of the fan motor. The signal depends on the fan type:
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Fan Type
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Signal
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Output V Nominal
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AC
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10% on 90% off sq. wave pulse
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10V
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E.C.D.C.
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50% on 50% off sq. wave pulse
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10V
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Low Speed Warning Detector (LSWD)
The Low Speed Warning Detector (LSWD) utilizes a programmable frequency switch capable of turning “on” or “off” a load such as an LED, audible alarm, back-up fan, etc, at a predetermined motor RPM. If fan speed falls below the present value, the back-up or warning device is activated. Once the fan speed exceeds the present value, it is deactivated. The RPM value is preset at the factory between 2,000 and 20,000 RPM (actual value is determined by the specific fan performance and customer requirements).
Inverted Blowers
Inverted Blowers have their driving motor located inside the squirrel cage wheel. This results in unusual compactness and excellent motor cooling. Such an arrangement is only feasible whenever the wheel diameter is large in proportion to the volume of air moved. This situation may be obtained in slow volume of air moved. This situation may be obtained in slow running blowers as well as in tight scroll squirrel cage blowers that have a high pressure-to-volume ration performance.
![]() General
Physical envelope: inlet diameter 5.00”; length ranges from 4.50” to 6.25”
Weight: varies— between 18 and 23 lbs.
Designed for larger flow capacity than Model D blowers, used for moderate static pressure applications where dissipation needs are high
Typical applications: computer mainframes, transmitter tubes
Nom. speeds range between 2,860 and 3,380 RPM
Airflows range from 500 to 970 CFM
Maximum Static Pressure: 2.6 IWG
Materials and Finishes
All aluminum components finished with a chemical conversion coating per MIL-C-5541, top coat of lusterless black enamel, color #37038, per Federal Standard 595 conforming to TT-E-489 Type B.
Painted or epoxy powder coat on steel housing
Corrosion-resistant stainless steel shaft and hardware
Zinc-plated impeller runs on two high-precision, double-shielded, stainless steel ball bearings (ABEC Class 1) for a long, maintenance-free life
Motors have stator winding insulation which is rated for continuous duty for Class F
AC Powered Units
3-phase and 1-phase permanent-split capacitor motor designs
Fixed speeds (performance) based on input frequency.
Meets or exceeds the requirements of MIL-B-23071 and other applicable U.S. military and commercial aerospace specifications
Max free delivery airflow of 850 CFM at 50Hz, 970 CFM at 60 Hz
Ambient temperature range: -54°C to 100°C
Acoustic levels as low as 67.9 dBA
DC Powered Units - E.C.D.C. ®
Not available with this model blower
Optional DC-AC Inverters and AC-DC Converters for AC Powered Models
BATAC®Inverter Driven Units
AC square wave fans are driven from a DC power source through a BATAC® Inverter.
DELTAC®Converter Driven Units
DELTAC®Converters allow high frequency (typically 400Hz) fans to be driven by variable frequency (typically 360-800 Hz) power or low frequency 50/60 Hz power to obtain the higher frequency performance
Options/Accessories
Inlet Screen Guards
LSWD (Low Speed Warning Device)
FPS (Fan Performance Sensor)
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AMETEK Rotron has provided highly reliable fans and blowers to the military and aerospace markets since 1947. Through a broad range of product development experience, AMETEK Rotron has demonstrated its ability to design, develop, qualify and support cost effective, reliable products on aircraft and defense platforms worldwide. Our products are designed to meet specific environmental specifications (including shock and vibration, humidity, salt spray, temperature extremes, EMI, water resistance, etc). We have successfully qualified many products for use in Aerospace and Military applications, which meet, or exceed the imposed environment specifications.
With over 25 product families, a high degree of vertical integration and core competencies in the design and manufacture of aerodynamics, electromechanical assemblies, motor drives and liquid vapor cycle cooling systems, we offer the widest product range in the world, with thousands of P/N’s active and available today. At the same time, we specialize in working with our customers to create unique product configurations to address the specific cooling requirement – not only for the cooling capability, but space claim, weight, noise, power draw and system controls.
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