Langdon, Inc.
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rectangular ductwork
FRP Duct 3/8" Wall. PCD Definition – Hot dipped galvanized steel, G60 or better is cleaned and treated for coating, then a primer is baked onto both sides. Finally a 4 mil. Polyvinyl chloride coating is baked on both sides (4X4).
rectangular duct
22 Gauge Type 4X4 PCD Ductwork. PCD Definition – Hot dipped galvanized steel, G60 or better is cleaned and treated for coating, then a primer is baked onto both sides. Finally a 4 mil. Polyvinyl chloride coating is baked on both sides (4X4).
rectangular duct
22 Gauge Type 4X4 PCD Takeoff. PCD Definition – Hot dipped galvanized steel, G60 or better is cleaned and treated for coating, then a primer is baked onto both sides. Finally a 4 mil. Polyvinyl chloride coating is baked on both sides (4X4).
square duct
24 Gauge Type 4X4 PCD Ductwork with TDC connection. PCD Definition – Hot dipped galvanized steel, G60 or better is cleaned and treated for coating, then a primer is baked onto both sides. Finally a 4 mil. Polyvinyl chloride coating is baked on both sides (4X4).

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  • Rectangular Ductwork
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