Cesco Products, a division of Mestek, manufactures AMCA-rated louvres and control dampers and UL-classified life-safety dampers for commercial HVAC systems. Its life-safety range is split into combination fire and smoke dampers, smoke dampers, and dynamic and static fire dampers, with fifty-six products listed to UL 555S — the smoke damper standard — and sixty-three to UL 555. The company publishes its UL listings as a searchable certification filter across the catalogue, and manufactures at Wyalusing in north-eastern Pennsylvania. It is an AMCA member company.