Originally Posted by
Brent Crouse
Flex aluminum
Brent,
Is it flexible aluminum foil (basically aluminumized mylar) or that flexible aluminum duct?
In the photo it looks more like that slinky aluminumized mylar stuff - which is not allowed.
The real flexible aluminum (easy to tell and feel the difference) is okay.
If it collapses up like a slinky and you can extend it back out (like it was an accordion), that is that aluminumized junk.
If it comes all collapsed up into a short piece and you stretch it out (and it usually dents and deforms when trying to collapse it back), then that stuff is okay.
Looks like I can see the spiral wound slinky inside, that's why I think it is that foil stuff. That is only approved for use as "air duct", i.e., such as exhaust from a bath fan.