Wherever the ductwork leaves the compartment from which it serves (shown in blue) it will have to retain integrity and insulation fire ratings for a similar period of time as the compartment through which it passes. On top of that, this segment examines the critical job that grease filters Enjoy https://felixrgujx.develop-blog.com/44444150/5-essential-elements-for-grease-tight-extract-ductwork