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Symptom Cause
Solution
Replace missing screws, bolts, gaskets, or caulk
Seal any holes or punctures in the system
Damper any unused collection points
Air leaks in the collection system
(continued)
Consult Customer Service (1-800-479-6801)
Take airflow readings and compare to the design of
application
Evaluate fan performance (fan curve) vs. design of
application
Damper fan accordingly
Increase/decrease fan wheel width to achieve desired
performance
Replace fan with larger or smaller unit, depending on
application
Fan sized incorrectly
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Perform a system balance to discover possible problems
Review duct design, adjust blast gates to designed settings
Rework ducts to achieve desired performance
Poor inlet or outlet design, redesign for optimal
performance
Install new blower to compensate for poor airflow
Consult installer of ductwork
Duct sized incorrectly
Consult Customer Service (1-800-479-6801)
Reference:
Industrial Ventilation-A Manual of
Recommended Practice
Resize duct according to industrial standard
Change hood type to improve collection performance
Reposition collection point or hood to improve performance
Consult installer of ductwork
Collection point incorrectly positioned
Consult Customer Service (1-800-479-6801)
Check to see if the fan is turned to the “on” position
Check required fan power requirement vs. what is supplied
Check that power supply is “hot”
Incorrect wheel rotation, correct motor wiring
Damage to fan wheel – replace wheel
Wheel mounted backwards on shaft, rotate wheel
orientation
Temperature too high, replace motor for one better suited
Bent shaft, replace shaft
Broken or damaged belt; adjust, repair, or replace belt
Build-up of dirt or dust, clean fan
Bad or damaged bearings; lubricate, repair or replace
bearings
Confirm correct motor starter is used
Check condition and repair the motor starter
Check that all fuses and switches are operational
Check for faulty wiring or shorts in wiring
Consult the fan manufacturer
Replace fan/motor if necessary
Refer to appropriate fan manual
Fan malfunction
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Speed set too high on motor, slow motor down
Fan over capacity, replace with larger fan
Poor Airflow (continued)
Motor overloads
Density of gas/dust above design, replace with larger fan