Trane Bypass Humidifier

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Model Number
THUMD Bypass Humidifier


  • Trane


  • For use with all furnace models
  • Front cover access for humidifier pad replacement
  • UV-Resistant cabinet and scale control insert
  • Aluminum humidifier pad treated with ceramic clay
  • Brass solenoid valve with stainless steel valve seat
  • Saddle valve
  • Built-in summer/winter damper
  • Field convertible duct connection, left or right side
  • Includes 120/240V transformer
  • 5-Year limited warranty on parts
  • Optional extended warranty
Part #
Model #
Type Gal/Day Area Covered
Ship Wt
70087 THUMD300ABA00B Large Bypass, Automatic 17 Up To 4,000 Sq ft 15 lbs
70086 THUMD200ABM00B Small Bypass, Manual Control 12  Up To 3,000 Sq ft  14 lbs