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Quest 746 480V Industrial Dehumidifier — 746 Pints/Day

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Order today, ships between December 25 - January 12, 2026
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Quest 746 480V Industrial Dehumidifier — 746 Pints/Day

Struggling to control humidity in a large-scale commercial space without overloading your electrical system? The Quest 746 480V dehumidifier provides a powerful, industrial-grade solution, delivering exceptional moisture removal while operating with maximum energy efficiency.

Designed for agriculture facilities, manufacturing plants, and warehouses, this unit is a cornerstone for any controlled environment requiring precise humidity management. It extracts an incredible 746 pints of moisture per day and boasts an industry-leading efficiency of 7.3 pints per kWh. This performance is powered by the patented M-CoRR™ multi-coil technology, which recycles energy during the dehumidification process, making it the most efficient 480-volt dehumidifier on the market.

Engineered in Madison, Wisconsin for continuous, demanding operation, the Quest 746 functions flawlessly in temperatures from 56°F to 95°F. It features integrated MERV 13 filtration to capture dust, pollen, and airborne contaminants. The 480V three-phase power configuration draws only 6.5 amps, freeing up crucial electrical panel space for other equipment, making it one of the most versatile industrial dehumidifiers available.

Features

Patented M-CoRR™ Technology

Multi-coil design reuses energy for industry-leading 7.3 pints/kWh efficiency.

🔌
Low Amperage Draw

480V operation requires only 6.5 amps, freeing up electrical panel space.

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Commercial Grade Construction

UL rated and ETL listed with integrated handles for flexible installation.

🌡️
Wide Operating Range

Functions effectively from 56°F to 95°F across varying humidity levels.

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MERV 13 Filtration

Superior air cleaning removes dust, pollen, mold, and bacteria from the air.

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Auto Restart Function

Automatically returns to previous settings after a power outage.

Quest 746 California Title 24 Compliance

The Quest 746 480V dehumidifier meets California Title 24 energy standards for both ducted (whole-home) and non-ducted (portable) installations. This compliance ensures the unit meets strict energy efficiency requirements for commercial applications in California and other jurisdictions with similar standards.

  • Non-Ducted Energy Factor: 6.3 Pints/kWh @ 65°F | 60% RH
  • Ducted Energy Factor: 7.1 Pints/kWh @ 73°F | 60% RH

Quest 746 Installation Options

The Quest 746 offers two primary installation configurations to accommodate your space requirements:

Quest Quest 746 480V Industrial Dehumidifier freestanding installation
Freestanding Unit

Place the unit directly on the floor with integrated handles for positioning and maintenance access.

Quest Quest 746 480V Industrial Dehumidifier overhead mounting option
Can be Mounted Overhead with Use of 3/8″ Threaded Rod

Mount using 3/8" threaded rod through integrated hanging points to maximize floor space utilization.

Quest Quest 746 480V Industrial Dehumidifier P-trap diagram
P-Trap Requirements

Both configurations require proper P-trap installation for condensate drainage through the 3/4" threaded NPT drain port.

Specifications

Specification Value
Water Removal @ 80°F/60% RH 746 Pints/Day
Efficiency @ 80°F/60% RH 7.3 Pints/kWh
Supply Voltage 480V – 3 Phase
Current Draw 6.5 Amps
Power Consumption 4,266 Watts
Operating Temperature Range 56°F Min – 95°F Max
Air Flow (CFM) 1,750
Unit Dimensions 44.8″ L x 28.9″ W x 34.1″ H
Unit Weight 340 lb
Air Filter MERV Rating MERV 13
Refrigerant Type R410A
Drain Port Connection 3/4″ Threaded NPT
Part Number 4037610

Warranty

The Quest 746 480V dehumidifier is backed by a comprehensive 5-year warranty, reflecting Quest's confidence in the quality and durability of their Madison, Wisconsin engineered and assembled equipment. This extensive warranty coverage provides peace of mind for commercial applications requiring reliable, continuous operation.

FAQs

How does Quest's M-CoRR™ technology make the 746 more efficient?+

The patented M-CoRR™ (Multi-Coil Refrigerant Recovery) technology uses a unique multi-coil design to capture and reuse energy that is typically lost. This allows the Quest 746 to achieve its 7.3 pints per kWh efficiency, reducing energy costs while maximizing moisture removal. You can learn more in our complete guide to Quest dehumidifiers.

Is the Quest 746 suitable for my facility?+

The Quest 746 is designed for large-scale commercial applications. With a 746 PPD capacity and 1,750 CFM airflow, it's ideal for large cultivation facilities, manufacturing plants, and warehouses. For even greater capacity, consider the Quest 876, or if your needs are slightly less, the Quest 506 is another excellent high-capacity option.

What are the daily maintenance requirements for the Quest 746?+

The unit requires minimal daily maintenance. Key tasks include regularly inspecting and replacing the MERV 13 filter (18″ x 20″ x 2″), ensuring the condensate drain line is clear, and periodically cleaning the coils depending on the environment. The auto-restart function ensures it returns to its previous settings after any power interruption.

What installation flexibility does the Quest 746 offer?+

The Quest 746 can be installed as a freestanding unit on the ground or mounted overhead using a 3/8" threaded rod to save floor space. It includes integrated handles and hanging points for easier positioning. The unit requires a hardwired electrical connection for its 480V three-phase power supply.

How does the 480V configuration benefit my electrical system?+

The 480V three-phase configuration is highly efficient, drawing only 6.5 amps. This is significantly lower than comparable lower-voltage units, which frees up valuable space on your electrical panel for other critical equipment and can reduce overall electrical infrastructure costs.

What does the 5-year warranty cover?+

The Quest 746 includes a comprehensive 5-year manufacturer warranty covering defects in materials and workmanship. Since the unit is engineered and assembled in Madison, Wisconsin, Quest provides direct warranty support, ensuring reliable operation in demanding commercial environments.

Does the Quest 746 require external controls?+

Yes, the Quest 746 requires an external controller for operation. This allows for seamless integration with existing building management systems (BMS), environmental controllers, or standalone humidistats, providing maximum flexibility for precise environmental management.

Shipping & Returns

Order Processing & Shipping

We currently ship within the United States only. No international shipping is available at this time.

Order Processing:

  • Most orders are processed within 24-48 hours after being placed.
  • Some products may have extended processing times of 7-14 business days or more, which will be clearly indicated on the product page. If your order includes such items, you will receive an email from our team or be contacted directly to confirm the estimated shipping timeframe.

Shipping Times:

We partner with reliable national carriers to deliver your orders. While specific delivery times can vary, here's a general timeframe for each carrier:

  • USPS: Typically delivers between 9:00 AM and 5:00 PM, Monday through Saturday.
  • FedEx: Typically delivers between 8:00 AM and 8:00 PM, Monday through Friday, with some Saturday deliveries.
  • UPS: Typically delivers between 9:00 AM and 7:00 PM, Monday through Friday, with some Saturday deliveries.

Note:

  • These are estimated delivery hours and may vary depending on your location and specific delivery circumstances.
  • For the most accurate delivery information, please refer to the tracking details provided once your order has shipped.

Free Shipping

Free shipping on qualified items to the lower 48 states. Some that are not eligible are stated on their respective product information page. Learn more

Refunds & Returns

Cancellations are accepted within 24 hours of placing an order.
Returns are subject to each manufacturer's return policy. Please look into the return policy of the brand prior to ordering. Learn more

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