The King Mini Make-Up Air Unit MMAU Series is a compact, packaged, all-in-one solution designed to replace air removed by exhaust systems. Its space-saving design fits between rafters and joists, making it ideal for installations where space is limited.
The MMAU delivers 100% outside air to help meet building ventilation requirements, maintain balanced building pressure and reduce indoor temperature fluctuations and air-quality issues. Field-adjustable fan-speed and temperature settings support a wide range of airflow, temperature-rise and static-pressure requirements.
Featuring a backward-curved centrifugal blower, fully modulating electric heat and built-in relay-logic controls, the MMAU can supply tempered outside air to the return or supply side of an HVAC system or directly into the occupied space.
- Packaged, All-In-One Make-Up Air Solution
- Compact Design Fits Between Rafters & Joists
- Meets Building Codes Requiring 100% Outside Air Supply
- Tempered makeup air Up to 628 CFM @ 0.0" Static Pressure
- 1.5kW to 7.5kW Models
- Available in 120V 1Ph; 208V/240V 1Ph or 3Ph
- Proportional Thermostat For Fully Modulating Electric Heat (1°F Accuracy)
- Integrated 0-to-60-Minute-Per-Hour Fresh-Air Cycle Timer
- Wide Range of Field-Adjustable Settings of CFM, Temperature Rise & Static Pressure Configurations
- Included Duct Sensor For Precise Set Points
- Provisions for Field-Installed Current Transformer Integration with Exhaust Systems
- Relay Logic Control Circuit Enabling Control of Other Make-Up Air Components
(Damper, Exhaust Fans, Outside Thermostat & Humidistat, Etc). - Horizontal Or Vertical Installation (not including downflow)
- Replaceable MERV 7 Air Filter (1" Thick)
- Proudly Made in the USA with U.S. & Global Materials
- 5-Year Limited Warranty
Comfortable Fresh-Air Ventilation
Today’s tightly constructed homes and commercial buildings require controlled fresh-air ventilation. During cold weather, the MMAU preheats incoming outside air to a preset discharge temperature, helping maintain indoor comfort and balanced building pressure.
Fresh Air. Tempered for Comfort.
Easy HVAC System Integration
Built-in relay-logic controls support integration with field-installed components, including motorized dampers, exhaust fans, outdoor thermostats, humidistats and building management systems.
Available Models
Ordering Information - Single Phase
| MODEL | UPC | VOLTS | KILOWATTS | BTU (000) | AMPS | PHASE | FAN DIAMETER | CASE SIZE | DUCT COLLAR | REVIT |
|---|---|---|---|---|---|---|---|---|---|---|
| MMAU1201-1-175-4-PTT | 70384 | 120 | 1.5 | 5.1 | 12.5 | 1Ph | 175 | A | 4" | Revit |
| MMAU2002-1-175-4-PTT | 70388 | 208 | 2.25 | 7.7 | 10.8 | 1Ph | 175 | A | 4" | Revit |
| MMAU2005-1-220-6-PTT | 70390 | 208 | 4.5 | 15.4 | 21.6 | 1Ph | 220 | B | 6" | Revit |
| MMAU2006-1-220-6-PTT | 70392 | 208 | 5.7 | 19.5 | 27.4 | 1Ph | 220 | B | 6" | Revit |
| MMAU2008-1-220-6-PTT | 70396 | 208 | 7.5 | 25.6 | 36.1 | 1Ph | 220 | B | 6" | Revit |
| MMAU2402-1-175-4-PTT | 70389 | 240 | 2.25 | 7.7 | 9.4 | 1Ph | 175 | A | 4" | Revit |
| MMAU2405-1-220-6-PTT | 70391 | 240 | 4.5 | 15.4 | 18.8 | 1Ph | 220 | B | 6" | Revit |
| MMAU2406-1-220-6-PTT | 70394 | 240 | 5.7 | 19.5 | 23.8 | 1Ph | 220 | B | 6" | Revit |
| MMAU2408-1-220-6-PTT | 70398 | 240 | 7.5 | 25.6 | 31.3 | 1Ph | 220 | B | 6" | Revit |
Ordering Information - Three Phase
| MODEL | UPC | VOLTS | KILOWATTS | BTU (000) | AMPS | PHASE | FAN DIAMETER | CASE SIZE | DUCT COLLAR | REVIT |
|---|---|---|---|---|---|---|---|---|---|---|
| MMAU2006-3-220-6-PTT | 70393 | 208 | 5.7 | 19.5 | 15.8 | 3Ph | 220 | B | 6" | Revit |
| MMAU2008-3-220-6-PTT | 70397 | 208 | 7.5 | 25.6 | 20.8 | 3Ph | 220 | B | 6" | Revit |
| MMAU2406-3-220-6-PTT | 70395 | 240 | 5.7 | 19.5 | 13.7 | 3Ph | 220 | B | 6" | Revit |
| MMAU2408-3-220-6-PTT | 70399 | 240 | 7.5 | 25.6 | 18 | 3Ph | 220 | B | 6" | Revit |
Engineering Specs
Engineering Specifications
Contractor shall furnish and install King MMAU Series Mini Make-Up Air Unit manufactured by King Electrical Manufacturing.
Performance Range: Up to 628 CFM at 0.0 in. w.c. and 1.5–7.5 kW, depending on model. Airflow is field adjustable, with model-specific performance data provided for static pressures from 0.0 to 1.0 in. w.c. The unit is certified for operation up to 0.50 in. w.c.
Electrical: 120V single-phase; 208V and 240V single- or three-phase, depending on model, as scheduled.
Motor: Direct-drive, high-efficiency, thermally protected, permanently lubricated ECM motor with no belts to adjust or maintain.
Blower: Backward-curved centrifugal blower for compact ducted make-up-air applications.
Fan Speed Control: Digital dual-speed blower control shall provide field-adjustable LOW and HIGH settings from 750 to 4,500 RPM, depending on the model.
Modulating Heat: Solid-state relays (SSRs) shall provide fully modulating heat and be mounted in the blower compartment for incoming-air cooling.
Temperature and Timer Control: A digital proportional controller shall modulate heat to maintain discharge-air temperature within 1°F. Temperature shall be adjustable from 45°F to 90°F, with Integrated 0-to-60-Minute-Per-Hour Fresh-Air Cycle Timer.
Duct Sensor: A field-installed Type 2 NTC, 10K-ohm duct sensor shall control discharge-air temperature. Install at least 3 ft downstream of the unit.
Heating Elements: Quick-heating, long-life Pic-A-Watt® elements shall provide field-selectable output and be steel-frame supported with ceramic insulators.
Low-Voltage Terminal Block: All low-voltage control wiring shall terminate at a 14-point terminal strip with factory-side quick connections and field-side screw terminals.
Control Circuit: Built-in relay-logic control with dedicated 24 VAC power shall support a motorized damper, exhaust fan, HRV/ERV relay, and low- and high-speed fan-demand inputs.
Current Transformer Integration: Provisions for Field-Installed Current Transformer Integration with Exhaust Systems.
Lockout Circuit: A lockout circuit shall accept an outdoor thermostat, humidistat, or BMS input to prevent operation until external conditions are met.
Overtemperature Protection: A 24 V high-temperature limit circuit shall protect each heating element. An electrically held manual limit shall monitor the entire unit and require power to be disconnected for several minutes before reset.
Enclosure: The MMAU shall be constructed of welded, 20-gauge electrogalvanized sheet metal with a corrosion-resistant gray finish. Side access shall be provided for wiring, adjustments, and service.
Mounting and Clearances: The compact, plenum-rated unit shall be certified for zero-clearance horizontal or vertical installation, except downflow. Mounting provisions shall include joist hangers, a surface flange, and 1/4-20 suspension points. 24 inches of service clearance in front of access panels.
Wiring Access: Provide separate line- and low-voltage access knockouts and knockouts for an optional disconnect.
Filter: The unit shall include a 9″x9″, 1-in. thick replaceable MERV 7 filter.
Duct Noise Control: Factory-installed outlet insulation reduces unit and duct-transmitted noise.
Optional Disconnect: The unit shall have the option to mount an internal supply-power disconnect.
Approvals: The MMAU shall be Underwriters Laboratories (UL) approved and labeled. The unit shall meet UL 60335-2-40 requirementsrequirements and City of Chicago codes for plenum use.
Downloads
Related Products
Model CKL
- 208, 240, 480 volt
- 30,000 to 240,000 watt
Approved for use in inaccessible areas of buildings. Can withstand dirty, dusty, moist or mildly corrosive environments. Ideal for large offices or factories.
Model MAU Series
- 208, 240, 480V volt
- 3,800 to 34,500 watts
Looking for fresh air? Exhaust systems are often very powerful, removing thousands of cubic feet of air per minute. When air is removed from your kitchen, it needs to be replaced with fresh air. King's Made in USA Make-Up Air Unit is a smart solution.