Nu-calgon NUCAL-4190-02 Humidifier Water Treatment Filter

Product Description

The NU-CALGON NUCAL-4190-02 is a water treatment filter designed for residential humidifiers with a capacity of up to 25 gallons per day. It inhibits scale buildup inside the humidifier for a full heating season, helping maintain system efficiency without frequent manual cleaning. The filter accepts 1/4-inch FPT threaded connections and can be mounted in either a vertical or horizontal orientation. HVAC technicians and service professionals install this filter as part of routine humidifier maintenance or seasonal startup procedures.

This filter is suited for use with bypass, flow-through, and drum-style humidifiers that operate on cold water supply lines. It is intended for one season of use and should be replaced at the start of each humidification season. It is not rated for use on hot water lines. The 1/4-inch FPT thread connection fits standard supply line configurations found in most residential forced-air humidifier installations.

Key Features

• Handles humidifiers rated up to 25 gallons per day output
• 1/4-inch FPT threaded connection for standard supply line hookup
• Installs vertically or horizontally to suit cabinet and plumbing layout
• Inhibits scale accumulation for one full humidification season
• Designed for cold water supply lines only — not for use on hot water lines
• Supports quick seasonal change-outs with straightforward thread-in replacement

Compatibility

Designed as an OEM-style replacement water treatment filter for residential humidifiers rated up to 25 gallons per day that use a 1/4-inch FPT cold water supply connection.

Installation Notes

Installation is typically performed by a licensed HVAC technician during seasonal startup or as part of a humidifier service call. Shut off the water supply to the humidifier before removing the old filter and installing the new one. Do not install on hot water supply lines. Replace the filter at the beginning of each humidification season to maintain effective scale inhibition.

Technical Specifications

• Type: Water Treatment Filter
• Maximum Humidifier Capacity: 25 gallons per day
• Connection Size: 1/4-inch FPT
• Mounting Orientation: Vertical or Horizontal
• Service Life: One humidification season
• Hot Water Line Compatible: No

Standard Information

• Brand: NU-CALGON
• Manufacturer Part Number: NUCAL-4190-02