SERVICES Explore Our ServicesFloor Opening Reinstatement Large Diameter Openings Wall or Ceiling Single Sided Reinstatement Duct / Square Openings Specialty Repairs Duct / Square Openings Core Seal’s innovative solutions don’t stop at round holes. Core Seal uses similar techniques to provide singled sided square duct infill solutions. Message Us Get in touch below for general queries or to request further information. Request a Quote 905-216-4690 Name Email Address Message Submit Open Hours 905-216-4690 Email enquiries@coreseal.ca Linked In