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What is the part number for the support post needed when ordering Trench duct wider than 17"? For example part number RSV182100120 trench duct?
All Trench Ducts
The Online Digest does not show what the support post part number is, but references it in description of any Trench duct wider than 17" requires a support post.
Due to widths wider than 17", support is needed in the middle of the trench duct to support weights put on the cover
The 5 foot long support post is part number RSP60