Justrite Safe-T-Vent Thermally-Actuated Cabinet Damper
The Justrite 25777 Safe-T-Vent™ is an FM-approved thermally-actuated damper designed to ventilate safety cabinets without compromising cabinet integrity during a fire. Its corrosion-resistant stainless steel construction, reversible design and fusible link provide reliable ventilation control for cabinets storing flammable liquids and hazardous materials.
The fusible link melts at 165°F, automatically closing the valve plate to stop airflow through the cabinet vents during a fire. Its heavy-duty body helps reduce external-to-internal heat transfer, while brass bushings and a washer support smooth, reliable valve operation.
Suitable for manual and self-closing Justrite safety cabinets that accept 2-inch NPT threads. Each cabinet requires two dampers: one for fresh air intake and one for exhaust ventilation.
Specifications
- Brand: Justrite
- Model Number: 25777
- Product Type: Thermally-Actuated Cabinet Damper
- Series: Safe-T-Vent™
- Material: Stainless Steel
- Connection: Nominal 2-Inch NPT
- Compatible Pipe: 2-Inch Nominal NPT Schedule 40 Steel Pipe
- Fusible Link Activation Temperature: 165°F
- FM Approved: Yes
- NFPA Compliance: Meets NFPA 30 Requirements
- Reversible Design: Yes
- Exterior Dimensions: 76 mm H × 117 mm W × 108 mm L
- Net Weight: 1.6 kg
- UPC: 697841229723
- Applications: Flammable Liquid, Pesticide, Acid, Corrosive and Hazardous Material Safety Cabinets
Usage Note: Ventilation systems should be designed in consultation with a professional engineer. Install using non-combustible ducting and suitable static-management measures.
California Proposition 65 Warning: This product may expose users to chemicals including lead, which is known to the State of California to cause cancer, birth defects or other reproductive harm.

