It was 2005. I didn’t think a whole lot about it, but it was the start of a sea change. For fan powered terminals, there were standard motors and there were new motors. The new “electrically commutated,” or EC motors were a lot more expensive
Don’t tell Armstrong I said so, but Design Envelope is the worst name for an awesome product. I still don’t know where the Envelopes are.
You’re more likely to get the performance that you specify, with any HVAC product, if that product carries a third party certification from AMCA or AHRI.
The return air boot is a real value-add for most tenant finish projects because they increase privacy between offices. Acoustical consultants love them.