Mister-Mini Duct-Mounted Atomizing Humidifier

Trion Mister-Mini Duct-Mounted Atomizing Humidifier (265000-001)

The Trion Mister-Mini (265000-001) is a duct-mounted atomizing humidifier that delivers whole-home humidity by dispersing a fine mist directly into your warm air supply duct. This compact unit operates on 24V power and requires no water pans or pads, making it a clean, low-maintenance solution for controlling indoor humidity levels. Designed for homes where space is tight or traditional bypass and fan-powered humidifiers won't fit, the Mister-Mini mounts directly to the ductwork through a 3.125" x 3.125" opening. The system includes a universal humidistat and a built-in temperature switch that work together to maintain your set humidity level while preventing operation when duct air isn't warm enough for effective evaporation.

Key Features & Benefits

• Atomizing Mist Technology: The unit sprays atomized water directly into the airstream, where it evaporates immediately. This eliminates standing water and the stagnant odors, bacteria, and mold growth that can occur with reservoir-style humidifiers.
• Compact Duct-Mount Design: With a mounting footprint of just 3.125" x 3.125", this humidifier fits into tight mechanical spaces where larger units cannot. Installation is straightforward because the unit mounts directly to the supply duct without requiring a bypass plenum or external housing.
• Built-In Temperature Safety Switch: The integrated temperature sensor prevents the humidifier from operating when supply air temperature is too low for proper evaporation. This protects your ductwork from condensation and ensures every drop of water is converted to humidity, not puddles.
• Universal Humidistat Control: The included humidistat can be installed on the wall or in the cold air return duct, automatically turning the unit on when indoor humidity drops below your set point. You maintain consistent comfort without manual adjustments.
• Tilt-Out Nozzle Assembly: The nozzle assembly tilts out for fast access to the atomizing nozzle, strainer, and solenoid valve. Routine maintenance like nozzle cleaning or replacement takes minutes, not hours.
• Brass Water Fittings: All water connections use brass fittings, providing leak-free operation and long-term durability. The 1/4" compression connections are easy to plumb and resist corrosion.
• Adjustable Capacity: Humidity output can be increased or decreased by changing the nozzle size. This allows you to match the humidifier's capacity to your home's actual needs without replacing the entire unit.
• 2-Year Limited Warranty: Trion backs the Mister-Mini with a 2-year limited warranty covering defects in materials and workmanship.

Compatibility & Requirements

The Mister-Mini requires 24V AC power, typically drawn from your furnace transformer. It connects to a 1/4" water supply line using brass compression fittings, and is designed for installation in the warm air supply duct of forced-air heating systems. The unit works with any furnace that produces sufficient warm air temperature for evaporation, monitored by the built-in temperature switch. The humidistat can be mounted on a wall or in the cold air return duct, depending on your preference and system layout.

Installation & Care

Installation involves cutting a 3.125" x 3.125" opening in the supply duct, mounting the unit with the included hardware, connecting the 1/4" water supply line, and wiring the 24V power and humidistat. The tilt-out nozzle assembly allows quick access for periodic cleaning of the atomizing nozzle and checking the water strainer. For areas with hard water, installing an inline water filter (such as a calcium/magnesium filter) upstream of the humidifier is recommended to prevent nozzle clogging from mineral buildup.

What's Included

• Mister-Mini humidifier unit with mounting bracket
• Universal humidistat
• Atomizing nozzle (installed)
• Mounting hardware
• Installation instructions

Warranty & Support

The Trion Mister-Mini comes with a 2-year limited warranty covering defects in materials and workmanship. Replacement parts, including nozzles and O-rings, are available for ongoing maintenance and service.

Frequently Asked Questions

Q: What is the Trion Mister-Mini duct humidifier manual?
A: The Mister-Mini includes printed installation instructions in the box. A user guide and product overview in PDF format are available on the SupplyHouse product page under the Manuals section, covering installation steps, wiring diagrams, humidistat setup, and maintenance procedures.

Q: How do I troubleshoot my Trion Mister-Mini duct humidifier?
A: If the unit isn't producing humidity, first check that the humidistat is calling for humidity and that the furnace is running with warm supply air. Verify 24V power is reaching the unit and that the water supply valve is open. If the nozzle is clogged, tilt out the nozzle assembly and clean or replace the atomizing nozzle. The built-in temperature switch will prevent operation if supply air isn't warm enough.

Q: What size opening do I need to install the Mister-Mini?
A: You need to cut a 3.125" x 3.125" square opening in your warm air supply duct. The unit mounts directly over this opening using the included mounting bracket and hardware, making it one of the smallest duct-mounted humidifiers available.

Q: Can I adjust the humidity output of the Mister-Mini?
A: Yes. The Mister-Mini's capacity is controlled by the nozzle size. You can increase or decrease humidity output by installing a different nozzle, allowing you to match the unit's performance to your home's square footage and humidity needs without replacing the entire humidifier.

Q: Does the Mister-Mini require a water filter?
A: While not required, an inline water filter is strongly recommended, especially in areas with hard water. A fine particle filter or calcium/magnesium filter installed upstream of the humidifier will prevent mineral buildup that can clog the atomizing nozzle and reduce performance.

Q: Where should I install the humidistat?
A: The universal humidistat can be mounted on an interior wall in a central living area or installed in the cold air return duct. Wall mounting provides easy access for adjustments, while return-duct mounting senses whole-home humidity more accurately. Both installation methods are covered in the user guide.

Q: What voltage does the Mister-Mini operate on?
A: The Mister-Mini operates on 24V AC power, which is typically supplied by your furnace transformer. This low-voltage connection is safe and straightforward to wire during installation.

Q: How often do I need to clean or replace the nozzle?
A: Nozzle maintenance frequency depends on your water quality. In areas with hard water or mineral-heavy supply lines, inspect the nozzle monthly during the heating season. The tilt-out design allows you to access and clean the nozzle in minutes. If cleaning doesn't restore full spray pattern, replace the nozzle (replacement nozzles are available separately).

Q: Will the Mister-Mini work with my furnace?
A: The Mister-Mini works with any forced-air heating system that produces warm supply air. The built-in temperature switch ensures the unit only operates when supply air is hot enough to evaporate the mist, so compatibility depends on your furnace running during heating cycles, not on a specific furnace brand or model.

Q: What comes in the box with the Mister-Mini?
A: The package includes the Mister-Mini humidifier unit with mounting bracket, universal humidistat, installed atomizing nozzle, mounting hardware, and installation instructions. You will need to supply the 1/4" water line, 24V power connection from your furnace, and any optional inline water filter.