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KITCHEN VENTILATION SYSTEMS

Grease Extraction

Greenheck is leading the industry in grease abatement. Innovative filter designs and a method of testing for cooking emission particle sizing has allowed Greenheck to develop the most efficient mechanical filters on the market. All of the filters are UL 1046 listed and most filters are available in aluminum or stainless steel. Sizing options are 16 x 16 inch, 16 x 20 inch, 20 x 16 inch, and 20 x 20 inch.

Types of Filters and Efficiencies

The graph shown represents the efficiency of a waterwash hood. Each filter type has a graph similar to this.

  • The overall shaded area represents the amount of grease emissions from the cooking equipment.
  • The dark shaded area represents the amount of grease taken out of the airstream by the filter.
  • The lightly shaded area represents the grease particulate that escaped past the filter.
  • The ratio of dark shading to light shading at a particular particle size is represented by the fractional efficiency curve. Filters with higher efficiencies will have more of the total shaded area darkened.

Grease Grabber™ Filter (GG Series)

The Grease Grabber™ uses a centrifugal type filter as the primary stage of filtration along with a packed bead bed filter as the second stage. Interception is the main filtration mechanism which works by adsorbtion of grease particles as they come in contact with the packed bead bead. The Grease Grabber has a cut point at 2 µ. Its efficiency increases to near 100% at 7 µ and drops for particles smaller than 2 µ. This reduction in the size of particles that can be removed indicates that the Grease Grabber uses a combination of all filtration mechanisms. The static pressure drop is the highest of the filters evaluated but only slightly higher than water wash. Typical pressure drops for a 9 ft. x 4 ft. hood at 2050 cfm will be 1.1-1.3 in. wg. Available in stainless steel. Grease Grabeer filtration can be retro-fitted to many other hood models.

GG-GX Filter

Grease-X-Tractor™ (GX Series)

The Grease-X-Tractor™ is 50% efficient at 5 µ. A cut point of 5 µ is typical of a centrifugal filter. Its efficiency improves rapidly above 5 µ and drops below 5 µ. The use of centrifugal force rather than two-dimensional impaction allows the efficiency to be improved without a high penalty in static pressure. Airflow enters the filters louvers and is spun in a chamber until it exits the back of the filter. Grease particles are thrown from the airflow during its helical path. The velocity of the airflow determines how small of particle can be removed. The static pressure is between a baffle filter and a water wash hood. Typical pressure drops for a 9 ft. x 4 ft. hood at 2050 cfm will be 0.7-0.8 in. wg. Available in aluminum or stainless steel.

GX Filter

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Baffle Filter (GH Series)

The efficiency curve for the baffle filter and the cartridge filter shows that at 8 µ its ability to remove particulate is 30%. Baffle filters use inertial impaction, which is the principle of the particle’s momentum throwing the particle out of the airflow as it changes direction, to remove grease from the airflow. Typical pressure drops for a 9 ft. x 4 ft. hood at 2050 cfm will be 0.5-0.6 in. wg. Available in aluminum or stainless steel.

 

XB-GH Filter

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Water Wash / High Velocity Cartridge Hoods (GW and GK Series)

Water wash hoods have the filtration system built into the hood and are 50% efficient at about 6.5 µ. The point at which a filter is 50% efficient is called its cut point. This shows that the water wash / high velocity cartridge hoods are still dependent on inertial impaction. Their higher efficiencies than the baffle filter are also reflected by a much higher static pressure. Typical pressure drops for a 9 ft. x 4 ft. hood at 2050 cfm will be 1.1-1.3 in. wg.

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Catalog:
Kitchen Ventilation Systems - All Products (275k)
Grease Extraction (2732k)
Application and Design Guide

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