That's why, kitchen area exhaust duct joints must be welded instead of making use of slip & travel joint or TDC joint. Considering the fact that galvanized steel and aluminium are very difficult to weld, black steel substance is chosen for kitchen exhaust ducts. Find out about NIMH priority regions https://aerosealductsealingsaraso67428.rimmablog.com/35484997/facts-about-dehumidifiers-sarasota-revealed