Speedi-Boot SBH-412 - 4" x 12" HVAC Vent Boot Hanger (SBH 412) Reviewhttp://tinyurl.com/pk36abr Speedi-Boot SBH-412 - 4" x 12" HVAC Vent Boot Hanger (SBH 412) NOTE: Includes only the 4x12 hanger; BOOT SOLD SEPARATELY.Improved indoor air quality & energy efficiency.Proudly assembled in the U.S.A.Labor savings with a 2-minute installation means faster project completion.16" - 24" arm extension capability.