Does Your Kitchen Exhaust Fan Meet Code

Does Your Kitchen Exhaust Fan Meet Code

Does your Kitchen Exhaust Fan meet code?

Most restaurant managers are so tied up with the day to day operations inside the kitchen that they have no idea of the potential hazards that are occurring on their roof tops. There are a few simple things to look for that can help assure your fan is up to code and that you avoid potential down time for your restaurant or damage to your exhaust fan.

The first thing to inspect is to see if your up-blast fan (or bowl shaped fan) has a hinge kit installed. The Importance of a hinge kit is to allow access to the vertical duct of your exhaust system by allowing the fan to open to a ninety degree angle. This provides proper access to the duct to clean your kitchen exhaust system properly without harming the mechanics or structural integrity of the fan. A typical exhaust fan weighs around 125lbs and is made of spun aluminum. The material can be bent very easily in the cleaning process even when extreme precaution is taken.

The next thing to inspect is the electrical conduit on your exhaust fan. You want to look for two things. The first is that the electrical conduit is run externally from the duct curb into the fan housing of the fan see photo below.

fan

The importance of this is to insure that the wiring for the fan is not exposed to grease build up within the system and keep the wiring from becoming damaged from taking the fan on and off during the cleaning process. The removal of the exhaust fan during cleanings can cause wiring to become exposed and potentially cause a fire or breaker to trip from metal to metal contact. This can cause costly down time for your restaurant.

Once you have insured that the wiring is ran externally, the second item to look for is inspecting the integrity of the wiring. The external wiring should be ran through weather proof conduit it to protect it from exposure to rain and grease from the system. See Photo Below

fan2   Exposed Electrical Conduit

 NFPA 96 – 7.8.2.1 states that  Rooftop termination shall be arranged with or provided with the following:(8) A hinged up-blast fan supplied with flexible weatherproof electrical cable and service hold-open retainer to permit inspection and cleaning that is listed for commercial cooking equipment. It is very important to make sure that the wiring on your roof top is not exposed to the weather conditions. Wiring that is exposed can cause fires if introduced to grease on the roof top and/or cause the fan to short out at any given time costing your business time and money. 

NFPA 96 – 8.1.1.1 states that – Approved up-blast fans with motors surrounded by the airstream shall be hinged, supplied with flexible weatherproof electrical cable and service hold-open retainers, and listed for this use. 

 

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 www.thehoodboss.com for any other questions.  

Does Your Restaurant Exhaust Fan Meet Code

Does Your Restaurant Exhaust Fan Meet Code

Most restaurant managers are so busy with the demands of the day to day operations inside the kitchen that they unaware of the potential hazards that are occurring on their roof tops. There are a few simple things to look for that can help you assure your fan is up to code and help you avoid potential down time for your restaurant or damage to your exhaust fan.

First, inspect your up-blast fan (or bowl shaped fan) has a hinge kit installed. The Importance of a hinge kit is to allow access to the vertical duct of your exhaust system by allowing the fan to open to a ninety degree angle. This provides proper access to the duct to clean your kitchen exhaust system properly without harming the mechanics or structural integrity of the fan. A typical restaurant exhaust fan weighs around 125lbs and is made of spun aluminum. The material can be bent very easily in the cleaning process even when extreme precaution is taken.

Next, inspect the electrical conduit on your exhaust fan. You want to look for two things. The first is that the electrical conduit is run externally from the duct curb into the fan housing of the fan see photo below.

Electrical Conduit on Exhaust Fan

This is a properly ran external electrical conduit on a restaurant exhaust fan.

The importance of this is to insure that the wiring for the fan is not exposed to grease build up within the system and keep the wiring from becoming damaged from taking the fan on and off during the cleaning process. The removal of the exhaust fan during cleanings can cause wiring to become exposed and potentially cause a fire or breaker to trip from metal to metal contact. This can cause costly down time for your restaurant.

Secondly, after you have insured that the wiring is ran externally, you need to inspect the integrity of the wiring. The external wiring should be run through the weather proof conduit to protect it from exposure to rain and grease from the system. See Photo Below

 

Exposed Electrical Conduit on Exhaust Fan

This is an example of exposed wiring on a restaurant exhaust fan.

It is very important to make sure that the wiring on your roof top is not exposed to the weather conditions. Wiring that is exposed can cause fires if introduced to grease on the roof top and/or cause the fan to short out at any given time costing your business time and money. 

 NFPA 96 – 7.8.2.1 states that  Rooftop termination shall be arranged with or provided with the following:(8) A hinged up-blast fan supplied with flexible weatherproof electrical cable and service hold-open retainer to permit inspection and cleaning that is listed for commercial cooking equipment. 

NFPA 96 – 8.1.1.1 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.