OLS Non-return damper frame is constructed of high quality hot-dipped pre galvanised steel sheet of 1.20mm thick cold-formed ‘C’ channels. The channels are mechanically fastened and welded at each corner. The standard frame depth is 150mm with 38mm flange for duct to duct connection; other frame depth and flange dimensions are available upon request.
- Blade-edge neoprene seal on each blade is provided to minimize air leakage from backflow
- Damper may be fitted with counterweight for pressure relief function.
- Maximum size of one module damper is 900mm by 1500mm.