Pentair Direct Air Intake Duct For MasterTemp | 461031The Pentair 461031 MasterTemp Direct Air Intake Duct Kit is a complete OEM solution for safely supplying combustion air to indoor MasterTemp pool heaters. Using a 3 inch PVC duct, it delivers clean outside air directly to the combustion chamber, improving efficiency and protecting the system from indoor contaminants. The duct may be installed vertically or horizontally, offering flexibility in tight or complex equipment rooms. This kit includes the