Corner-Matic
Model CM-C/F-DH automatically inserts corners into both ends at once and crimps them into place. The optional adjustable model accepts 4- to 6-foot sections.

Whisper-Loc Seam Closer
Models FAH-3456 & FAH-1872 are available in the horizontal or vertical and close Pittsburgh seams in 3- to 6-foot duct sections.