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This stuff actually UL listing and stamped for sealing flexible duct, I got this at Sid Harvey's but evidently it's available at Home DepotWould metal tape be better?
I know there are several “duct tapes” I know not to use the stuff in the hardware section or the paint section or the impulse rack at checkout but there are a few different types in the HVAC section.
https://www.homedepot.com/p/Nashua-...-555-FlexFix-UL-Listed-Tape-1207803/100575721
I wouldn't really worry much about using most Nashua or 3M duct tape, those are good brands.