Or not.  I stumbled upon this little ad when I was looking for a good price on the foam I use to build Duc-Blocs.  I’m sure that the good folks who spent many tens of thousand of dollars developing this product and brining it to market understand the concepts of Manual D and Manual T (not to mention S, RS, H, P, – oh, yes – and J).  Hopefully they weren’t just pandering to granny’s and uncle Joe’s desire to muck with the airflows in each and every room of the house.  Ay, caramba.  My next post will be a discussion of the “Four Schools of Thought on Where to Stick a Supply Register in a Room”.  Until then, can you guess what they are?

Here’s a little quiz question to dwell on: What’s better for heating a room, floor registers or ceiling registers, and why?