Hart & Cooley, LLC, including Selkirk Corporation and Selkirk Canada Corporation manufactures residential and commercial prod ... ucts including grilles, registers and diffusers, duct system components, type-b gas vent, commercial venting, residential chimney venting, chimney liners, rooftop products, access doors, and commercial hatches & smoke vents. Our brands include Selkirk, Airmate, AmeriFlow, AmeriVent, AMPCO, Hart & Cooley, Lima, Milcor, PortalsPlus, Polyflue, Heatfab, Roof Products & Systems (RPS) and Ward. read more