Duct and fire rated assembly

The building inspector has indicated that Type-X drywall must be installed behind all metal duct works. So today we removed some of the existing duct works and installed 5/8″ Type-X drywall behind the ducts.

This is the first floor, from the left, you see Type-X drywall behind one furnace supply duct, three return air ducts, and two HRV supply/return duct. We’ve sealed any opening with fire block foam.

This is the on the second floor. From the left is one furnace supply duct and three return air ducts.

This is on the 3rd floor. There’s only a return air duct here on the 3rd floor.