16" x 12" Fire-Resistant Standard Header

Product was exactly as described and came quickly.

The product choices and costs are much better than shopping at a big box store. I plan to use this product in my basement to cover the joist ends. My intent is to paint them and the basement ceiling so I don't have to hang ceiling tiles. Customer service from Supply House is exceptional. I had questions answered within minutes and the product on my doorstep with a few days. So much time saved rather than running around town finding these.

I use it for return air flow to stop it and it work great.

My joist bays varied in size a bit so some tweaking was required in a few places but overall they worked as intended. Basically just thin cardboard so you can trim and fold new tabs as required with scissors and a straight edge. Probably faster to use these than making your own out of a larger sheet of Thermopan but YMMV. Regular Thermopan sheets are the real deal though and I highly recommend them. Up to you if buying the "specialty" pieces like this are worth it to you. Definitely beats using sheet metal either way because these will not make clunking and clanging noises when you walk on the floor above like sheet metal often will.