INLINE FANS FAQs
Answers to your most Frequently Asked Questions about Greenheck inline fans.
Q:
Q:Can a solid state speed control be used on a belt drive fan?
A:
A:Greenheck does not offer solid-state speed controls on belt drive fans because a solid-state speed control requires motors have a PSC (permanent split capacitor) or shaded pole type. These motors are not used on belt drive fans because they have very low starting and running torque. Belt drive fans have added torque requirements due to bearings, belts, and pulleys, all which hinder the ability of the motor to start the fan or even keep it running if the voltage is dialed down on the speed control.
Q:
Q:Can belt drive inline axial and centrifugal fans be mounted with the motors at 3 or 9 o'clock?
A:
A:Yes. Greenheck's inline axial and centrifugal fan Models RA and BSQ-M are very versatile in mounting. However, keep in mind when mounting the fan with the motor on the side, the motor weight may cause uneven loading on the isolators. Overcome this uneven loading by mounting the fan on a set of rails that extend beyond the fan on both sides so that the weight of the fan and motor is between the outboard isolators.
Q:
Q:Can Centrifugal Inline fans be mounted outside?
A:
A:Model SQ-M or BSQ-M are not recommended for outdoor mounting. The construction of these fans is such that they are not weathertight.
Q:
Q:Can SQ-M or BSQ-M model fans be mounted vertically?
A:
A:Models SQ-M and BSQ-M can be mounted in any orientation, except for the larger/heavier motors need to be externally supported when the motor is on the side.
Q:
Q:Can inline vane axial fans be used for high temperature exhaust?
A:
A:
Typical applications for inline vane axial fans involve exhausting or supplying clean, ambient air. Greenheck's recommendation for continuous high temperature operation is 43° C (110° F) for direct drive vane axials, where the motor is in the airstream, and 93° C (200° F) for belt drive vane axials, where the motor is out of the airstream.
For emergency smoke ventilation involving temperatures above 200° F, please contact us.Q:
Q:What determines the minimum horsepower requirement for Greenheck centrifugal and industrial fans?
A:
A:Minimum horsepower for centrifugal and industrial fans is based on either the operating brake horsepower or the minimum starting horsepower of the fan. Operating brake horsepower is an obvious limit to the minimum motor horsepower, since the motor horsepower must exceed the operating brake horsepower for the fan to work. Minimum starting horsepower is based solely on the horsepower required to get the fan wheels rotating. Minimum starting horsepower becomes a significant factor for single width wheels above size 49 and double width sizes above 44.
Q:
Q:What factors prevent fans from not performing as specified?
A:
A:There are numerous reasons why fans may fail to perform as specified, but first it is important to understand what defines acceptable performance. According to AMCA Publication 200, a fan installed in a ventilation system should expect a tolerance of +/- 7.5% for flow (cfm). In other words, a fan which produces 1,000 cfm in a lab environment should provide a volume flow rate of 925 to 1,075 cfm when installed in a properly designed ventilation system. Volume flow rates falling below this range are typically the results of variances in system static pressure or mechanical problems with the fan. Common symptoms include:
Obstructions in the duct system - closed dampers, closed registers, dirty filters, clogged coils
Obstructions in the fan inlet - elbows to close to the inlet, walls too close to the inlet
Duct design - improperly designed turning vanes, leaks in supply or exhaust ducts
Fan related - impeller running backwards, fan speed too low, impeller dirty or clogged, clearances between inlet cone and wheel cone are incorrect.
Obstructions in the duct system - closed dampers, closed registers, dirty filters, clogged coils
Obstructions in the fan inlet - elbows to close to the inlet, walls too close to the inlet
Duct design - improperly designed turning vanes, leaks in supply or exhaust ducts
Fan related - impeller running backwards, fan speed too low, impeller dirty or clogged, clearances between inlet cone and wheel cone are incorrect.
Q:
Q:Which Greenheck India Inline Fans have CE certification?
A:
A:Greenheck India offers CE certification on model RA.
