The company's pressure-relief doors function to prevent ductwork from imploding or exploding in the event of excess pressure. The PZ10 (positive) and the VT10 (negative) pressure relief doors are designed to open automatically 1 in. w.g. above normal operating system pressure. The virtually air tight door is highly energy efficient in saving expensive filtered, cooled, or humidified air from escaping while still protecting ductwork.

- A-J Manufacturing Inc.
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