Trouble Shooting Your Kitchen Exhaust Fan

Trouble Shooting Your Kitchen Exhaust Fan

Vent hood cleaning can be a very invasive process.  The process includes using power washers and heavy duty degreasers.  Our work includes working on the roof top, in the sub ceiling, and downstairs in the kitchen.

From time to time, issues arise after a cleaning has occurred.  The most common call we get is that the exhaust fan is not turning on, or it is not working at its full capacity.  Here are a few frequently asked questions and resolutions.


  • Fan is not turning on at all.
    • Check main switch on canopy hood – flip on and off to make sure that it is getting power.
    • If no power is getting to the hood – check the breaker box. Flip switches for fans back and forth, even if they do not looked tripped.
    • If fan is getting power – check switch on roof top fan – these are sometimes accidentally left off after the cleaning process – if you are not comfortable with the location of the fan – call the last service provider.
  • Fan is still not turning on after these trouble shoots were completed.
    • Check for any exposed wiring on or around the exhaust fan. Check switches and ground wires.  Call an electrician to accomplish a thorough inspection.
  • The fan motor makes a humming or clicking sound when turned on, then shuts down.
    • The motor takes twice as much power to start up, than it does to run normally. This may cause motors that are already worn out to fail.  Call an HVAC company to either install a new motor or repair it.
    • The start-up of the motor may also cause worn belts to break. Call your current vendor to replace.
    • There may be a foreign object obstructing the fan blades. Call the last person to service your hood.
  • Fan turned on, but made a loud squeaking noise.
    • Loose or out of align belts will cause slippage on the pulleys when turned on.
    • Worn belt. – Change belt or call your service provider to replace
  • Fan is on, but is making loud rattling sound.
    • Broken belt. Call service provider to replace.
    • Fan could be out of balance due to an improper cleaning of fan blades.

These are just a few issues that can occur after a cleaning.  Most hood cleaning companies can service them on the spot, but other issues will require a licensed professional to remedy the issue.  Please give us a call at 972-704-1812 or visit us at for any other questions.  

The Importance of a Hinge Kit on Your Kitchen Exhaust System

The Importance of a Hinge Kit on Your Kitchen Exhaust System

Although kitchen exhaust system fans are supposed to be supplied with a hinge kit when installed, we still see a lot of fans without them. Hinge Kits are an important part of the make up of an exhaust fan although it has become an item that is typically not enforced by the authority having jurisdiction in each area. In order to walk you through the importance of the hinge kit, I want to list the three main reasons that you need a hinge kit. Those reasons are listed below.

NFPA 96  States that “Approved up-blast fans with motors surrounded by the air stream shall be hinged, supplied with flexible weatherproof electrical cable and service hold-open retainers, and listed for this use.”

Material that the fan is made of:
The up-blast fan on your roof top is made up of spun aluminum. Spun aluminum is a very light weight and pliable material. To give an example of how pliable its is, you can take a pair of pliers and bend the frame.

Cleaning Process:
In order to clean your kitchen exhaust system to code, your exhaust cleaning company has to access the bottom of the blades of the exhaust fan and the vertical duct leading down to the hood in the kitchen. Most cleaning companies try and treat your equipment as if it was there own. However, if your system does not have a hinge kit installed, the technician has to maneuver a 125 plus pound fan off the duct curb that is covered in grease as well as water from the cleaning.

In summary, even with the best of intentions, there are variables that can cause damage to your exhaust fan during the kitchen exhaust cleaning process. Assuring that you have a hinge kit on your exhaust fan will help prevent damage to the fan molding due to normal wear and tear from the exhaust cleaning service, damage to the roof top, and allow your service provider to have the proper access to clean your system properly.

If we can be of any assistance to you please do not hesitate to call at 972-704-1812 or you can visit us at our website at