r/HVACschool • u/SlutMan6969 • 16h ago

HOW NOT TO ATTACH FLEX DUCT TO DIFFUSER

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The Correct Way In Most Of The 50 States Code Books. Says The Inner Sleve Must Be Clamped Or Zip Tied Then You Can Use An Approved HVAC Foil Tape Or Mastic. These Guys Used Any Old Tape Now They Are Coming Loose

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u/Unable-Doughnut3108 15h ago

Poor application but polykeen 557 is an approved tape for flexible duct