EX-21 3 exhibit21subsidiaries10k20.htm SUBSIDIARY LIST
Exhibit 21
SUBSIDIARIES OF REGISTRANT
7720 Lehigh Property, LLC (Illinois corporation)
Boe-Therm A/S (Denmark)
MFRI Holdings (B.V.I) Ltd (British Virgin Islands)
Midwesco Filter Cicero, LLC (Illinois corporation)
Midwesco Filter Resources, Denmark A/S (Denmark)
Midwesco Filter Resources, Inc. (Delaware corporation)
Midwesco Mechanical and Energy, Inc. (Delaware corporation)
Nordic Air Filtration A/S (Denmark)
PermAlert Environmental Specialty Products, Inc. (Illinois corporation)
Perma-Pipe, Inc. (Delaware corporation)
Perma-Pipe Canada, Inc. (Delaware corporation)
Perma-Pipe India Pvt. Ltd. (India)
Perma-Pipe International Co. LLC (Delaware corporation)
Perma-Pipe Middle East FZC (United Arab Emirates)
Perma-Pipe Saudi Arabia, LLC
TDC Filter Manufacturing, Inc. (Delaware corporation)
Thermal Care, Inc. (Delaware corporation)