Sealing Flex Connections
Unsealed inner core leaks; insulation gap
Yellow / Check First1stBatch 5
What This Helps With
Unsealed inner core leaks; insulation gap
Apprentice words: seal flex
Trade terms: flex connection, inner band, outer band, mastic
Check First
Inner core mastic/banded, insulation pulled, outer banded
What Not To Do
Skip inner seal
What can go wrong: Banding outer only
Better Foreman Question
Two-band and mastic this flex connection?
Verify With
Reference type: manufacturer install instructions
Source to verify: Flex maker; UL 181; seal class
Safe wording: Per maker + seal class; UL 181 listed.