Aprilaire Model 300 Self-Contained Evaporative Humidifier
Specification Sheet
For Homes Heated with Boilers, Mini-Splits, Radiant Heat, and Other Ductless Systems
Specifications
Capacity: 13 gpd at 80 ft. effective hard duct length for homes up to 3,500 sq ft with tight construction[*]
Voltage, phase, frequency: 120VAC, 1 phase, 60 Hz
| E.S.P. (in. w.c.) | Airflow (CFM) |
|---|---|
| 0.0" w.c. | 270 CFM |
| 0.1" w.c. | 255 CFM |
| 0.15" w.c. | 250 CFM |
| 0.2" w.c. | 245 CFM |
Current draw: 0.7 Amps
Noise: 55 dBA (hard duct) / 49 dBA (flex duct)
| Dimension | Measurement |
|---|---|
| Width | 14 3/8" |
| Height | 12 1/2" |
| Length | 22 3/32" |
Weight: 29.2 lbs.
Inlet air operating conditions: Minimum 65°F
Inlet water operating conditions: Minimum 120°F
[*]Based on AHRI Guideline F Humidifier Sizing. Can satisfy a 2,000 sq ft home with average construction.
Dimensions Diagram Description
Diagram showing the dimensions of the Aprilaire Model 300 humidifier. The overall width is 14 3/8 inches, height is 12 1/2 inches, and length is 22 3/32 inches. Inlet air operating conditions require a minimum of 65°F, and inlet water operating conditions require a minimum of 120°F. The diagram also indicates various measurement points for duct connections and panel access.
Features
- [+] Whole-home fan-powered humidifier
- [+] Perfect for homes heated with boilers, mini-splits, radiant heat, and other ductless systems
- [+] Simple mounting and installation
- [+] Our quietest self-contained evaporative humidifier[*]
- [+] 30% more capacity than our Model 350 humidifier
- [+] Quick water panel replacement at bottom of unit
- [+] Ducted return and ducted supply available
- [+] Includes Model 65 digital humidistat, saddle valve, 6' power cord, mounting brackets
- [+] 5-year warranty
[*]When compared to Aprilaire Model 350 in the same conditions.
Principle of Operation
The Aprilaire 300 Series is a whole-home, fan-powered evaporative humidifier designed to draw air into the unit with a fan and undergoes evaporative humidification by passing incoming air over a wetted water panel. Humidification continues until the set point is reached. A time delay function keeps the fan blowing for several minutes after a humidity call is complete to dry out the water panel. When humidity as sensed by the humidistat drops below the set point, the humidifier begins another humidity cycle.
Application
The 300 Series is perfect for humidifying homes that do not have forced air systems. The unit is easily mounted onto joists and the duct can be fed into the living space through a grille.
Installation Options
Diagram Descriptions
Dual Outlet for Model 300: Shows the humidifier unit with two discharge registers labeled 'ROOM 1' and 'ROOM 2', connected via ductwork to the unit's outlet. An inlet register is shown connected to the unit's inlet.
Ducted Return and Ducted Supply: Depicts the humidifier unit connected to both a ducted return air path and a ducted supply air path, suitable for integration into a forced-air system's return and supply plenums.
Ductless Return and Ducted Supply: Shows the humidifier unit drawing air from a ductless return (e.g., a living space) and supplying humidified air into a ducted supply air path.
The unit can be mounted off the joists or in between joists which are spaced at least 14.5" apart. Hard duct or flex duct can be used. The sound of the unit decreases when using flex duct.
Dedicated Monitoring
MODEL 65
Dedicated monitoring and control of the humidifier from the living space.
| External | |
|---|---|
| Input voltage and current | Voltage: 24VAC (supplied by humidifier control board) |
| Control | External |
| Control range | 10%-50% RH |
| Accuracy | ±5% |
| Differential | 3% |
| Operating ranges | 40°F - 99°F / 5% - 90% RH (non-condensing) |
