MP-1800 Desiccant Dehumidifier — High-Volume Moisture Control Below Refrigerant Limits
Made to order — estimated 5-week lead time.
The Bry-Air MiniPAC MP-1800 is an 1,800 CFM desiccant dehumidifier built for large-scale environments where refrigerant systems cannot maintain humidity targets. Delivering 54 lbs/hr moisture removal without performance loss at low temperatures, it supports manufacturing, cold storage, and processing facilities requiring continuous drying. This stainless steel configuration is specified for corrosion resistance in demanding industrial and washdown environments.
The MP-1800 provides continuous moisture removal at scale without defrost interruptions or temperature-related capacity loss.
54 lbs/hr moisture removal — maintains consistent extraction under low-temperature and high-load conditions where refrigerant systems cycle or shut down
1,800 CFM process airflow — supports large open areas, loading docks, and multi-room production spaces
600 CFM reactivation airflow — continuously purges absorbed moisture through a dedicated exhaust airstream
Stainless steel construction — resists corrosion in high-humidity intake and washdown installations
No defrost cycle — eliminates downtime associated with coil icing in cold environments
Airflow safety controls — protects operation by monitoring airflow and triggering shutdown under restricted conditions
MP-1800 Applications and Environments
The MP-1800 is deployed in pharmaceutical manufacturing for tablet coating, granulation, and bulk packaging areas where humidity directly impacts product stability. Food processing facilities use it in confectionery production, gelatin processing, and dehydration operations where moisture control must remain consistent at lower temperatures. Cold storage warehouses and refrigerated distribution centers install it at loading docks and staging zones to prevent condensation on products, pallets, and structural surfaces. Power generation facilities apply desiccant drying to protect turbines, generators, and auxiliary systems from corrosion during standby. Museums, archives, and large-scale storage facilities use the MP-1800 when smaller systems cannot meet space volume or moisture load requirements.
MP-1800 Desiccant System Operation and Installation Requirements
The MP-1800 uses a rotating desiccant wheel to adsorb moisture from the process airstream, eliminating the need for compressors or evaporator coils. A dedicated reactivation airstream removes collected moisture and must be ducted to the building exterior to maintain system effectiveness. The unit operates continuously from sub-freezing temperatures up to 140°F with no defrost cycle or capacity drop. Installation requires 460/480V three-phase power and floor-mounted placement due to unit weight and airflow capacity.
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What makes the MP-1800 preferable to a refrigerant dehumidifier at 1,800 CFM for cold storage applications?
A refrigerant unit at 1,800 CFM requires a compressor-driven refrigerant circuit that loses capacity rapidly below 50°F ambient and stops effective moisture removal below 35°F. In a refrigerated loading dock or freezer staging area, this means periodic defrost cycles interrupting output and near-zero extraction at the lowest ambient temperatures — exactly when condensation is worst. The MP-1800 delivers its full 54 lbs/hr moisture removal at sub-freezing temperatures through a desiccant rotor with no compressor, no icing threshold, and no defrost cycle. The operational difference in cold environments is not marginal — it's the difference between a unit that works and one that cycles uselessly.
What duct sizing is required for the 600 CFM reactivation exhaust?
The 600 CFM reactivation exhaust requires a duct sized to handle that volume at low static pressure — typically an 18–20" round duct or equivalent rectangular duct at standard duct velocities. The reactivation external static is 0.5" wc, meaning the duct system must not impose more than 0.5" wc of resistance. Longer runs, elbows, and transitions add resistance — consult a mechanical engineer or refer to ASHRAE duct design tables to size the reactivation exhaust duct for your specific installation. The exhaust must terminate outside the building to prevent moisture recirculation.
Can the MP-1800 be used outdoors or in semi-exposed installations?
Not in standard configuration. The base MP-1800 is designed for indoor mechanical room installation. The optional weather kit is required for outdoor or semi-exposed installations — it provides enclosure protection against precipitation, wind-driven moisture, and temperature extremes that would damage the standard unit's electrical components. Contact Bry-Air or your distributor to confirm the weather kit specification and any installation restrictions for your specific climate.
How large a space can the MP-1800 serve, and how is that calculated?
At 1,800 CFM, the MP-1800 delivers 108,000 cubic feet of process air per hour. In a 10,000 sq ft warehouse with 16-foot ceilings (160,000 cu ft), that equates to approximately 0.675 air changes per hour — useful for moisture load management but not sufficient for rapid humidity drawdown. For tighter humidity targets or faster drawdown, multiple units or a larger Bry-Air industrial model may be appropriate. Bry-Air's engineering team can calculate required unit capacity based on your space volume, infiltration rate, internal moisture load, and target relative humidity.
What does the optional humidistat control, and when is it needed?
The optional humidistat — available as either a room humidistat or a duct humidistat — allows the MP-1800 to cycle on and off automatically when the conditioned space reaches its humidity setpoint, rather than running continuously. This is appropriate for spaces where the ambient moisture load is moderate and continuous operation would drive humidity below the target setpoint. In applications requiring continuous maximum extraction regardless of setpoint — pharmaceutical production lines in active operation, refrigerated dock areas with constant door cycling — manual continuous mode is more appropriate than setpoint cycling.
What is the MP-1800's weight and what does a 532-lb installation require?
The MP-1800 weighs 532 lbs. Installation requires a floor-mounted equipment pad or structural floor capable of supporting that static load, plus rigging or mechanical lift equipment to position the unit. Suspended or elevated installations require structural engineering review to confirm load-bearing capacity. The unit must be level for proper rotor operation and condensate drainage. Plan for forklift or pallet jack access to the installation location during initial setup and future maintenance.
How does the reactivation cooldown sequence protect the MP-1800 heater elements?
After a shutdown command, the MP-1800's reactivation cooldown sequence continues running the reactivation fan for a set period after cutting power to the heater elements. This allows the heater bank to cool down before airflow stops, preventing localized overtemperature on the heater elements and surrounding components. Shutting off airflow while heater elements are still hot would trap heat around the elements and adjacent materials, accelerating degradation. This sequence runs automatically on every normal shutdown — it is not operator-controlled.
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Orders are processed within 1-2 business days and then prepared for shipment.
5. How long does it take for my order to arrive?
Estimated arrival time (ETA) is 5-7 business days for all orders.
6. Do you offer warranty?
All our products come with a manufacturer warranty of at least 1 year, depending on the brand.
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