MicroCoil® Extreme® 300 Series Compact Grille

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When you need security in an opening with limited vertical space, our Extreme 300 Series MicroCoil Grille is the answer. Perfectly engineered to occupy the smallest amount of headroom on the market, our high performance compact grille not only coils in nearly 50% less room then other security grilles, but also gives you high performance.  The MicroCoil Grille is engineered to handle at least 300,000 cycles (opens/closes) at speeds of up to 24” per second. But, with the MicroCoil Grille, higher speeds do not mean you get a loud and clunky security grille. Our low headroom parking security grille’s patented nested link system actually minimizes noise and vibrations - making it one of the quietest and smoothest coiling parking garage gates available today.

In addition, ADA compliance is made easy. With most parking garage openings averaging 9’6”, accommodating parking spaces for 8’2” handicap accessible vans as required by ADA has become a huge challenge. Taking up less than 14” coiled grille headroom space at it’s largest (and often even smaller), the MicroCoil security grille allows almost any parking facility the opportunity to install rolling security grilles and still be in compliance.

Our compact parking lot security gates are easy to install in new construction as well as retrofit into existing parking structures. All high performance compact parking grilles are paired with our advanced Apex SmartController control panel, so programming and setting limits for your parking entrance gate is simple and will accept all activation systems. Safety is addressed with light curtains plus photo eyes to prevent potential harm or injury from the parking security grille. All compact parking grilles feature long lasting stainless steel links and a direct drive operator that eliminates sprockets and chains to wear or replace. You can customize perimeter parts and the grille manufactured to your exact specifications.

When a low headroom security solution is required, Cornell’s MicroCoil high performance compact grilles are the only security grilles that are low on space, but high on performance.

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The Extreme® 300 Series MicroCoil® Grille:

  • Requires nearly 50% less headroom than standard grilles
  • Helps make openings ADA compliant
  • Opens 3 times faster than a standard coiling grille 
  • Has a sustainable and durable design rated for continuous duty
  • Features a 2 year warranty on the operator and a 2 year/300,000 cycle warranty on additional components 


Our Extreme 300 Series MicroCoil® Grille comes in the following standard height and width parameters:

If your maximum height is less than or equal to…

…your maximum width available is:


26’ Stainless Steel Finish


26’ Aluminum Finish 

For openings that fall outside of the standard construction, please contact us

Standard Materials & Finishes

The 300 Series MicroCoil® Grille offers an open-air design for increased visibility and ventilation. Curtains are assembled with a minimum solid 5/16 diameter, 5056 H32 aluminum alloy sleeved with horizontal aluminum or stainless steel tube spacers to separate vertical links on alternate rods with continuous end tube spacers. The vertical spacing is 2.5" to 3.7" on center. Vertical chains are solid 1/8" minimum stainless steel links, 1/4 inch wide, positioned by aluminum or stainless steel tube spacers on 9 inch centers. Nylon insert nuts are threaded on to the end of each rod to secure the chains.

Pattern options include:

  • Brick pattern (EPG324CB)
  • Straight pattern (EPG324C)

Curtains can come in the following finishes:

  • Mill
  • Clear Anodized
  • Stainless Steel


Hood and Operator Covers

Metal cover to protect the coil or operator from exterior weather, debris or to meet OSHA or UL 325 safety requirements.

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Powder Coating Grilles

Powder coat finish in more than 180 colors is available on perimeter components such as the aluminum bottom bar, hoods, wall angles, tubes and fascia. This finish is not available on the grille curtain.

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Performance Upgrades

Seismic Performance Validation

We can provide project specific seismic calculations for all coiling doors that are mounted Face of Wall to steel or masonry. Seismic performance validation is per ASCE 7-05.

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Safety and Protection

Entrapment Protection Devices

Entrapment protection devices ensure that a motorized door or grille will not close on an object. If an object enters path of closure, the entrapment protection device will stop the door or grille from closing and return it to the fully open position.

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A wide variety of locking options are available to meet your security needs.

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Monitored Protection, Even at High Speeds

UL 325-2010 (NEMA 4X) compliant photo eye sensors allow for momentary contact operation – useful in parking garages and other high use openings. Interruption of the photo eye beam before the door fully closes causes the door to immediately halt downward travel and reverse direction to return to the fully open position. 

SafetyGard Light Curtain Technology

The 6’ tall light curtain is installed within the guide and blends into the guide construction. If the grille is cycling and an object passes through the curtain beams the door will immediately halt downward travel and reverse direction to return to the open position.

Unique Design Solutions

Sloping or Irregular Openings

Our special bottom bar designs can address these conditions.

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Specification Sheets

BIM Objects

Drawing Generator

Need to see clearances and mounting details? Enter your opening dimensions into our Drawing Generator, and get custom generated drawings of your door with all the details.
MicroCoil Grille Drawing Generator

Codes & Listings

  • ISO 9001:2008
  • Buy America Compliance
  • LEED® Compliance

See Codes and Listings page for detailed information.

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