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Product Spec Sheet: 
To secure your building's soundproofing, installing our 66" x 120" Galvanized Steel STC-50 Acoustical Roof Hatch - Milcor is the ideal choice. It uses acoustic insulation and heavy-duty materials with an STC-50 rating and prevents the penetration of unwanted noises. For its cover and frame, this hatch uses galvanized steel with an EPDM gasket for weatherproofing.
Our acoustical roof hatch is also UL 790 Certified for fire safety and features a fusible link that automatically opens the cover in the event of a fire. If you are interested, you can contact us, and we will be glad to answer your inquiries.