Flamebar BW11 has been designed and developed to be a lightweight, highly durable fire rated ductwork system complying with the latest standards. Flamebar BW11 is a specially formulated water-based compound which is sprayed onto metal ductwork. The premium coating contains selected mineral fillers in a low permeability elastomeric binder to a nominal thickness of 0.7mm to give a finished product, which has been successfully tested for international use under cellulosic fire conditions for up to and including 4 hours duration. Flamebar BW11 fire rated ductwork is produced in sections and assembled on site utilising tested fireproof gaskets and sealants.