A person is a
"person in the chain of responsibility" for a building product if—
(a) the person—(i) designs, manufactures, imports or supplies the building product; and(ii) knows, or is reasonably expected to know, the product will or is likely to be associated with a building; or
(b) the person installs the product in a building in connection with relevant work; or
(c) the person is an architect or engineer who, in designing a building, specifies that the product be associated with the building.