Aprilaire bypass humidifiers offer easy installation on the warm or cold air return of any forced air furnace. The #558 includes the Auto-Trac Control System and the #550 has a manual humidistat. Both models have a drain to flush minerals and solid residue from the system.

Capacity: .5 gallons per hour
Square Foot Area: 1,500 Sq. Foot Average House with 1 Air Exchange
Size: 12 7/8 Width x 12 3/4 Height x 9 1/8 Depth
Water Panel: #10
Electrical: 24V-60Hz-0.5 AMP
Drain Connection: 1/2 inch I.D. plastic hose direct to drain fitting on unit
Also Includes: Auto-Trac Control (#558), Saddle Valve and Transformer      # Aprilaire