LIMAC cnc cutting machine for pre insulated duct making LIMAC makes cnc machines for the fabrication of pre-insulated duct, PI duct, PIR duct, PU duct, phenolic foam duct, aluminum foil phenolic composite, fiberglass composite duct, ductwork, ventilation duct, pre insulated rigid polyiso duct, foil faced phenolic board, rigid Polyurethane foam, Polyurethane Insulation, rigid polyisocyanurate panel for HVAC (heating, ventilation, and air conditioning) and central air conditioning industry. LIMAC China