Backing Bars are provided to attach the fabric expansion joint to the adjoining duct or fan flange. These are provided on various materials and thicknesses to meet the design conditions. We can provide round units with split or single piece rings and rectangular units can be provided with four bars per side or welded picture frame. We offer a variety of standard finishes as well as hot-dip galvanizing.
Backing bars, or clamp bars, are steel bars or angles used to mount or clamp the fabric to the frame work or duct flange. FS products manufactures backing bars in a variety of materials and thickness as required based on the specific application. The backing bars are shipped as full rings or picture frames when practical. Holes are pre-punched to match the adjoining ductwork to allow quick and easy installation of our U-Joint Formed Flange expansion joints. Backing bars are typically shipped painted with our standard high-temperature silver primer, but custom coatings and galvanizing can also be applied.