• Blades close when activated by fire/heat
• 18 ga. cold rolled steel frame
• 18 ga. cold rolled steel adjustable “Z” blades
• Mitered corners secured with reinforcing clips
• Stainless Steel Spring
• 165degree Fusible link
• Free area 40%
• #8 x 3/4” Phillips head SMS
• Gray Primer (GPZ) powder coat finish
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Available Options at an extra charge
• Aluminum insect screen - 22 ga. 1/8” square mesh installed on exterior side unless requested otherwise
• Torx Security screws
• Galvanneal A40 steel
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