HVAC Register Boot, Galvanized, 30 Gauge, 3-1/4 x 10 to 6...
4"X14"-7" TORPEDO BOOT - Dorse & Company - Your Trusted HVAC Equipment Provider
IMPERIAL 4-in Galvanized Steel Straight Stack Duct Boot in the Duct Transitions & Connectors department at Lowes.com
4" x 10 x 6 End Galvanized-Steel HVAC Heating Cooling Register Duct Boot Fitting | eBay
HVAC Premium Rectangular Duct End Boot | End Register Duct Boots | 12" X 4" X 7" Galvanized Floor Boot End Center is Compatible with Duct 12" - Amazon.com
AIREX HVAC Boots - Where have you been my whole life
Sealing Duct Boots to Floor or Drywall | Building America Solution Center