The simplest is a fan unit that sits on top of the register. Another option is an in-line fan that you can install in the duct line. The third type, shown here, is a recessed fan that fits into ...

We bought a roll of 3-in. by 48-in.-wide by 50-ft. duct wrap for our installation. We also bought a few rolls of UL181 aluminum duct tape to seal the insulation seams. Cut the ductwork insulation ...