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57IB – Insulated Register Boot

57 Series, Ceiling Radiation Damper with Insulated Register Boot

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Features & Benefits

Approved UL L-587 design, quivalent to other designs: L-521, 546, 550, 562, 563 and P-544
Box and collar are 28 gauge with 1.5" R-6 duct liner insulation
Incorporates UL 555C evaluated ceiling damper
CRD frame and blades are 22 gauge

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