Speedi-Products EX-26A90 04 4-Inch Aluminum 90-Degree Adjustable Elbow Speedi-Exhaust Products are made in the USA Ideal for venting 3-Inch exhaust air duct systems Ideal for dryers, exhaust fans and range hoods Seal joints with approved duct mastic sealants and tapes Consult your local building codes for approved installation practices