Roof Mounted Exhaust Fan

1) Inspect Your Equipment

Before installing your roof mounted exhaust fan, inspect the equipment for any interior or exterior damage. Make sure you have all of the accessory items and that they are also damage free. Check for and retighten any bolts or screws that may have become loosened. Then, turn the blower wheel by hand to make sure that it is able to rotate freely.

2) Select and Prepare Your Site

The next step in installing your restaurant kitchen exhaust fan is to select and prepare the site where you will install it. Locate the fan as close as possible to the area it will be serving in order to limit any long or twisted duct runs. The fan discharge should be located at least 10 feet away from any supply intakes.

Confirm that your fan supports are strong enough to hold your equipment and make sure you have enough clearance around your installation site to safely set up your equipment and lift it into its final position. And of course, before installing or servicing any commercial kitchen exhaust equipment, always disconnect the power.

Roof Curb for Roof Mounted Exhaust Fan

3) Curb and Ductwork

Most rooftop ventilators are designed to be installed on top of a prefabricated or factory built roof curb. Follow the curb manufacturer’s instructions for proper curb installation. Roof curbs should be connected to structural roof members with at least four lug screws, anchor bolts, or other appropriate fasteners per curb flange.

Curb flanges should be caulked to the roof. The fan should be installed on a curb and/or rail elevated no less than 14” above any surface. Be sure that the duct connection and fan outlet are properly aligned and sealed. Then, secure the fan to the curb through the vertical portion of the ventilator base assembly flange using a minimum of eight lug screws, anchor bolts, or other appropriate fasteners.

Depending on the type of curb installation and roofing material, shims may also be required. When you are done installing, double check all fasteners for tightness.

4) Roof Mounting

The roof mounted upblast exhaust fans sold by are specified for a specific CFM and static pressure. The ductwork attached to these units can significantly affect their airflow performance. Due to this, it is important that flexible ductwork and square elbows not be used. It is also very important to avoid unnecessary transitions and turns in the ductwork near the fan inlet. These can cause system effect and drastically increase the static pressure while reducing the airflow.

For more information, you can refer to the guides and recommendations for duct runs set forth by the Sheet Metal & Air Conditioning Contractors’ National Association.

If your ventilation system requires a backdraft damper, you would install that first and secure it within the roof curb. A note of caution— National Fire Protection Association (NFPA) 96 fire codes recommend that dampers should not be installed when an exhauster is used for the removal of smoke and/or grease laden vapors from commercial kitchen equipment. You should also consult with your state and local codes for any more detailed requirements.

In accordance with NFPA 96, if you are installing an upblast kitchen hood exhaust fan, you will need to ensure that the discharge is at least 40 inches above the rooftop. Run the power cord through the conduit tube, which is located on the top skirt, outside of the unit. Then, secure the ventilator curb through the vertical portion of the ventilator base assembly flange using lug screws, anchor bolts, or other suitable fasteners.

5) Electrical

Now it’s time to connect the fan motor to your power source. Check to make sure that the voltage and phase of the power supply and the wire amperage capacity are compatible with the requirements listed on the nameplate of your fan motor.

Make sure the power line wiring is de-energized. Also, be sure to lock and tag the disconnect switch or breaker to prevent an accidental power up. The disconnect switch is located on the exterior of upblast fans and in the interior of downblast fans. On downblast direct drive fans, the disconnect function is built into the speed controller.

According to the National Electric Code, short circuit protection should be supplied by a dedicated branch circuit that is run to a junction box. Before you power up the fan, check the ventilator wheel again for free rotation and make sure that the interior of the fan is free of any loose debris or shipping materials. Be sure to check all fasteners for tightness and then re-install the motor dome. Please note that if any of the original wire supplied with the fan has be replaced, it must be replaced with type TW wire or equivalent.

6) Roof Mounted Exhaust Fan Accessories

A grease pipe is usually positioned towards the roof slope to provide single-point drainage of water and residue. Some means for collection such as an exhaust fan grease box must be provided. It can be placed directly under the exhaust fan trough or an adapter and pipe can be used to carry the water and residue to a remote collection point. offers a wide range of rooftop grease containment systems to suit any need.

Roof Mounted Exhaust Fan AccessoriesCode of the NFPA 96 fire codes states that “approved upblast fans with motors surrounded by the airstream shall be hinged.” Not only is it required, but a hinged exhaust fan is also much safer and easier to clean and maintain. So when installing a roof mounted fan, it’s smart idea to also go ahead and install an exhaust fan hinge kit. carries twenty different hinge kits to meet the needs of a variety of budgets and fan sizes. Please note that exhaust fans with hinge kits require extra slack in the wiring to the fan to allow it to be tilted back to a fully open position.

Another affordable solution to NFPA fire code requirements is our weatherproof exhaust fan access panel. It can be installed in less than 30 minutes and provides a four-inch opening for easy inspection and cleaning of fan blades.

One of our most popular roof mounted fan accessories is our exhaust fan safety handle. These unique handles provide a safer way to lift and close the inner fan and duct work without causing any damage to the fan bowl or seals. By providing easier access, they help prevent maintenance issues during cleaning, servicing, and fire inspection.

Before attempting to assemble, install, operate or maintain any commercial kitchen ventilation equipment, it is important to carefully read and save all of the materials that came with the product. And of course, protect your equipment, yourself, and those around you by observing all safety information.

If you have any questions about installing your roof mount fan, feel free to give our customer service specialists a call at 877.394.9731 or live chat with us on our website.

Restaurant Kitchen Exhaust Fan Replacement Parts

It’s just another Friday in your commercial kitchen — until someone notices that the upblast exhaust fan isn’t functioning properly. Your repair technician determines the problem is a simple fix but they don’t have the replacement part you need in stock.

After several more phone calls to locate the part, you realize you have no other choice but to shut down for the weekend. The worst part it is that you could have avoided all of this by keeping a few spare restaurant kitchen exhaust fan replacement parts on hand. Continue reading

Commercial Kitchen Ventilation Systems

Most of the tasks in commercial kitchens are accomplished with relatively simple tools: stoves provide a flame for cooking, refrigerators keep food cold, and knives chop. But one of the key exceptions to this principle is with a commercial kitchen ventilation system. What looks to be a simple box that allows air to escape is, in fact, a complex system of interconnected parts that must operate together for efficient ventilation.

In the harsh environment of a commercial kitchen, it’s critical to rely on an effective hood system to keep the work environment safe and clean, as well as to protect expensive equipment from damaging grease build-up. Thankfully manufacturers now produce ventilation systems that are lighter, more durable, and more able to handle the rigorous demands placed upon them. Continue reading

Ductmate Access Doors

At, we are dedicated to providing restaurant owners and managers with a diverse selection of hood accessories, which is why we are proud to carry high-quality duct access doors from Ductmate. Ductmate is the largest manufacturer of HVAC accessories in all of North America, and they are committed to offering a variety of different duct access doors to fit any situation or budget.

In addition to manufacturing durable, easy-to-install access doors, Ductmate is devoted to sustainability efforts, and they regularly incorporate green manufacturing processes into many of their products. They are also a member of the Green Building Alliance and the US Green Building Council so that you can ensure the safety of your kitchen while reducing your environmental impact. Continue reading

Food Truck Exhaust Fan

If you’re starting your own food truck business you have hundreds of decisions to consider, but one of the most important will be what type of ventilation system to install in your truck. Ventilation systems are the heart of any mobile kitchen, and they have to work hard in order to move a lot of smoke and debris out of a very cramped space. The best hoods are durable enough to handle the demands of a food truck kitchen, and efficiently keep the environment clean so you can do your best work. Continue reading

Omni Super Hinge

Routine maintenance and cleaning of your restaurant exhaust fan is one of the most important factors in keeping a commercial kitchen running. It can also be a dangerous job when moving the heavy and cumbersome fan off it’s base. That is why the NFPA mandates the use of an exhaust fan hinge to allow the fan to be suspended for safe maintenance and cleaning.

While many hinges on the market are constructed of low-grade materials and utilize precarious chains in order to hold the fan, the Omni Super Hinge is changing the game by reaching new levels of durability and ease-of-use. Thanks to the innovative design and strong construction of the Omni Super Hinge, you can open and close your exhaust fan over and over again without concern. Continue reading

Flame Gard Access Door

One of the most popular duct access doors on the market is the Flame Gard Access Door. It features a UL-listed, NFPA approved gasket that is rated to 2,300 degrees. Installing the Flame Gard door is simple and straightforward, so you’ll be able to get your duct system in compliance and easily accessible without a hassle.

Here’s what to do: Continue reading

Driploc Grease Catcher System

As with any rooftop grease containment system, a Driploc grease catcher includes absorbent pillows that soak up the fat, oil and grease and keeps it off the roof. Normally, these pillows are replaced every 3 months or with your regular kitchen exhaust cleaning.

Thankfully, when it comes time to switch out the old pillows for new ones, you’ll be able to complete the process in a few short minutes regardless of which Driploc grease catcher system you have. Continue reading

Grease Gutter Grease Containment System

The Grease Gutter grease containment system is a high-quality, easy-to-use solution that provides 360 degree protection around your exhaust fan and prevents grease from spilling onto the roof.

This popular grease collection device utilizes a single-piece absorbent pad that stops grease but allows water to flow freely through the unit. Once you’ve purchased your Grease Gutter containment system, you’ll want to have it up and running as soon as possible. The good news is that you can install it in minutes with just a few simple tools and instructions. Continue reading

Grease Gutter Absorbent Boom

Once you install the absorbent boom in your Grease Gutter rooftop grease containment system, you’ll no longer have to worry about oil and grease stains damaging your roof or causing dangerous fire hazards.

Because the booms are hydrophobic, they absorb a tremendous amount of oil while simultaneously repelling water. The filler material is specifically engineered to spread grease throughout the boom evenly, ensuring that you don’t end up with pools of grease that could accumulate and cause damage. Also, the outer shell is UV-protected and fire retardant for additional safety.

Installing the Omni Grease Gutter boom is very easy. Let’s go through the steps. Continue reading