Pentair 461031 Direct Air Intake Duct | MasterTemp 908130301 How often should I replace

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Pentair 461031 Direct Air Intake Duct | MasterTemp 908130301 How often should I replaceThe Pentair 461031 MasterTemp Direct Air Intake Duct Kit is a must have accessory for indoor MasterTemp pool heater installations, supplying clean combustion air via a 3 inch PVC duct that can be configured vertically or horizontally to suit compact or restrictive equipment rooms. This complete OEM kit includes the heater panel cut out, air orifice adapter, a short section of 3" PVC pipe, union fitting, and a screened termination cap that blocks