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Gain access to damper components inside low- to medium-pressure ductwork with this economical, durable and practical solution.

For low- to medium-pressure ductwork systems; allows easy and economical access to damper components in the ducts.

Provides positive pressure relief, allowing for automatic door opening at 2 in. wg (0.5 kPa) above normal operating pressure.

Easy to install leakproof door; tested to 20 in. wg and negative 10 in. wg with no leakage noted.

Delivers negative pressure relief, allowing for automatic door opening at 2 in. wg (0.5 kPa) above normal operating pressure.