Hence, kitchen exhaust duct joints have to be welded as an alternative to applying slip & travel joint or TDC joint. Because galvanized metal and aluminium are quite challenging to weld, black steel substance is decided on for kitchen area exhaust ducts. Have much more specific questions about This system https://eduardoetekr.dailyblogzz.com/37063601/top-guidelines-of-blower-door-testing-sarasota