Is smoke extract in multi-compartments always insulated? Can you use thermal insulation? And does it need to be insulated on the roof? Your top questions about smoke extract answered here ?

Do I need to insulate inside the kitchen? Can you put a fire damper inside the kitchen? What is the standard? Your top questions about kitchen extract answered here ?

Why can’t I just use insulation? What about ducts bigger than 1250mm? Why is my ductwork only E60? Your top questions about ductwork answered here ?