DETAILS
Shipping Cutoff Times
Shipping Type Order By
Standard Ground Small Parcel
FREE - On orders over $25 View Transit Map 		7:00 PM CST
Next Day Air
(Calculated at checkout) 		3:00 PM CST
Standard Ground Freight
FREE - On orders over $25 		1:00 PM CST
  • Shipping cutoff times apply to in-stock items. Please note item lead-times when placing your order.
  • Orders placed on weekends or holidays will be processed the next business day.
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    • Product # OFSD-311

    OFSD-311

    Greenheck Product # OFSD-311
    Class I leakage rated with airfoil blades, pressure up to 8 in. wg (2 kPa), velocity to 4000 fpm (20.3 m/s) and temperature to 350°F 177°C).

    Certifications:

    • AMCA Air Performance
    • California State Fire Marshal (CSFM) Listing #3225-0981:0103 and #3230-0981:0104
    • CAN/ULC S112 Classified Fire Damper
    • CAN/ULC S112.1 Classified Smoke Damper
    • UL 555 (Listing #R13317)
    • UL 555S (Listing #R13317)

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