Comparison : |
Item # 1147, 16 Inch (in) Damper Blade Size Round Blade Style Two Stud Air Flow Damper Item # 1148, 18 Inch (in) Damper Blade Size Round Blade Style Two Stud Air Flow Damper Item # 1149, 20 Inch (in) Damper Blade Size Round Blade Style Two Stud Air Flow Damper Item # 1150, 22 Inch (in) Damper Blade Size Round Blade Style Two Stud Air Flow Damper Item # 1151, 24 Inch (in) Damper Blade Size Round Blade Style Two Stud Air Flow Damper
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