277-05950 | Valve assy 2W NC 2-1/2", 63Cv, Eq Pct Bronze Trim Flanged 8" Pneu Act | Siemens Wall Thickness_0.038 in Technical Specification Sheet)Installation instruction(Duct Averaging Size_4X4-1/2 Rectangular Damper 20X22 ND G780DS-250+AFX24-MFT-S-X1
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