Description

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!!! INSURE THE APPLICATION TESTS FOR THE CORRECT VOLTAGE, CYCLE, AND PHASE BEFORE PURCHASING !!!

 

 

 

REPLACEMENT MOTOR SINGLE PHASE 115 VOLT: Please email or call for pricing

REPLACEMENT MOTOR THREE PHASE: Please email or call for pricing

REPLACEMENT BEARINGS: Please email of call for pricing

REPLACEMENT SHAFT: Please call or email for pricing

REPLACEMENT BLADE: Please email or call for pricing

REPLACEMENT TOPCAP/LID: Please email or call for pricing

 

 

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GI / GR

Gravity Vent

• High efficiency gravity roof ventilators designed using the latest Computational Fluid Dynamic (CFD) and Finite Element Analysis (FEA) software packages
• Bases are manufactured with a rounded flange around the throat that decreases pressure losses due to turbulence. (See CFD Models Below)
• Available with throats in widths from 12” to 72” and unlimited length starting at 12”.
• Units come standard with integral lifting lugs.
• Tie down points are standard to allow for additional restraints to be added in the field as required.
• Rain gutters are standard to help eliminate rain infiltration.
• Roll formed hood panels provide excellent strength characteristics as well as creating a unit that is architecturally pleasing.
• Units are designed to exceed 30 lbs./ft2 snowload rating.
• Hinged hoods are standard on GR units with less than a 73” throat length and GI units with less than a 61” throat length.

Designed with the latest in computer aided engineering software.

The new COOK GI and GR Gravity Ventilators were designed using the latest Computational Fluid Dynamics (CFD) and Finite Element Analysis (FEA) software. This allowed our engineers to optimize the geometry of the throat and hood to reduce pressure losses and increase efficiency, while maintaining structural integrity. Once the design was optimized, physical prototypes verified the performance and durability of the design. The result is the most efficient Gravity Ventilator in the industry.

CFD Simulation

The figures above depict the relative turbulence of each unit and illustrate the improved airflow achieved by the new COOK design.
As can be seen in the figures, the radius throat design significantly reduces turbulence as compared to the typical square throat design.

Description: Unit shall be a hooded high efficiency roof mounted gravity ventilator.

Construction: The unit shall be of bolted and welded construction utilizing corrosion resistant fasteners. The hood shall be constructed of minimum 18 gauge aluminum, bolted to a minimum 8 gauge aluminum support structure. A radius throat must be provided for optimum performance. Lifting lugs shall be provided to help prevent damage from improper lifting. A rain gutter shall be provided to prevent rain infiltration. The base shall have continuously welded curb cap corners for maximum leak protection. Birdscreen constructed of 1/2” galvanized mesh shall be mounted in the hood. Unit shall bear an engraved aluminum nameplate and shall be shipped in ISTA Certified Transit Tested Packaging.

Product: Units shall be model GI and GR as manufactured by LOREN COOK COMPANY of Springfield, Missouri.

Intake Hood Velocity Notes

Velocity to 500 FPM: Velocity below 500 FPM provides for a level of protection against the influx of airborne mist or debris.

Velocity 500 FPM to 1000 FPM: Within this velocity range there is a possibility that fine, airborne mist will be carried into the building through the vent. Care should be taken in the location of the unit if airborne mist is a problem.

Velocity Greater Than 1000 FPM: Velocity in this range is not recommended unless special means are taken to prevent the influx of airborne matter and large droplets of moisture into the interior of the building. Velocities shown are to be used as a guide only. Final application and conditions will be a governing factor.

 

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