The Cornermatic II Whisper-Lock Combo is a unique, innovative machine that not only inserts and crimps corners into both ends of ductwork but closes longitudinal Pittsburgh seams on the same ductwork when required. This design allows the operator to accomplish both corner insertion and seam closing on one machine without having to handle the ductwork between processes.
The corner insertion is a pneumatically operated process that rapidly and automatically inserts and crimps corners into both ends of ductwork that uses the transverse duct connector (TDC) or transverse duct flange (TDF) method of joining. This unit automatically places a corner piece into a corner on each end of the duct and crimps them securely and permanently into place.
The seam closing is powered by an electric motor and gearbox using a Variable Frequency Drive. It will accommodate duct with various end joining methods. It will close the Pittsburgh seam as well as insert corners on any ductwork that uses the duct flanges conforming to T25-a or T25-b under the Duct Construction Standards. It will also close the Pittsburgh seam on ductwork that uses the raw edge or slip and drive method.
The Cornermatic II Whisper-Lock Combo requires only compressed air and 460/3/60 current to operate.
Specially designed corners for automation are quickly loaded into the magazines from the shipping cartons. The corners come oriented and stacked in the carton for quick and easy loading. The Cornermatic II Whisper-Lock Combo is capable of utilizing standard StrapPak™ corners. The standard StrapPak™ come loaded with 80 corners per sleeve for the traditional Cornermatic type and with 78 corners per sleeve in the EZ Connector type.
Cornermatic II Whisper-Loc Combo Model CM-II-FAH-1660 US Patent No. 9,027,376 and 9,157,653
Flange Type for Insertion
Motor / Voltage
Dimensions / Weight
Iowa Precision Cornermatic II Whisper-Loc Combo
16 to 26 (.062" to .022")
Coil Width: 60" ± 1/8"
(1524 mm ± 3.2 mm)
Mild Steel Only
Transverse Duct Connector (TDC) and/or Transverse Duct Flange (TDF) — Customer to Specify
Depends on strapped or boxed corners used
Approximately 2.5 seconds per corner
460/3/60 2.3 Full Load Amps
Air Required: 9 CFM @ 100 psi (6.8 BAR) min. Other 3 phase voltages available
Weight: 1,800 lbs.
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