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How to measure for the correct sizeUSR-SRH20F-1
Pre-scored Outlines per Diameters from 6" - 18" Outer Dimensions 23.75" x 23.75" Plenum Box Depth 5.25" Plenum Size 20x20 Filter Size to be used: 20x20x1
For Lay-In T-Bar Ceiling - High Quality Steel Construction
2/3" bar spacing - Horizontal bars are fixed at 45 degrees for Great Airflow Dynamics
Concealed Hinges and Latches to achieve a clean and modern look
R6 Fiberglass Back Plenum accepts 6" to 18" Round Spin-in Collars or Start Collars (not included) - Accepts 1" disposable filter (not included) - Recommended Size: 20x20x1