The Bry-Air MiniPAC MP-350 is a 350 CFM three-phase desiccant dehumidifier for mid-scale industrial humidity control — removes 11.7 lbs of moisture per hour and operates effectively below freezing where refrigerant equipment fails. Specified for pharmaceutical manufacturing, food processing, electronics assembly, and large-format cold storage. Stainless desiccant rotor housing for corrosive and high-cycling environments.
MP-350 MiniPAC Desiccant Dehumidifier — 350 CFM Three-Phase Humidity Control for Industrial and Critical Environments
The Bry-Air MiniPAC MP-350 is a 350 CFM desiccant dehumidifier engineered for mid-scale industrial and institutional applications where refrigerant equipment cannot maintain target humidity: pharmaceutical manufacturing floors, cold storage warehouses, electronics production areas, and laboratories requiring sustained low relative humidity independent of ambient temperature. At 11.7 lbs/hr moisture removal and 222 lbs, the MP-350 handles applications that exceed single-phase MiniPAC capacity — stepping up to three-phase power for higher throughput while retaining the compact MiniPAC footprint that fits in mechanical rooms and process areas where full-scale industrial desiccant units are impractical.
MP-350 Desiccant Wheel Technology and Safety Systems
The MP-350 uses a rotating desiccant wheel — not a compressor or refrigerant circuit. Process air (350 CFM) passes through the desiccant rotor where moisture is adsorbed into the hygroscopic matrix. The rotor continuously rotates into the reactivation sector where heated reactivation air (117 CFM) drives absorbed moisture out and exhausts it away from the dry process stream. No icing threshold, no defrost cycle, no compressor maintenance — the unit provides continuous moisture removal across operating conditions where LGR equipment fails.
350 CFM process airflow at 0.90" wc external static — sized for larger laboratories, pharmaceutical production rooms, cold storage areas, and industrial process environments
11.7 lbs/hr moisture removal — consistent extraction rate across the full operating temperature range, independent of ambient conditions
Water-washable desiccant rotor with stainless steel flange — field-serviceable without chemical cleaning agents; stainless flange resists corrosion during high-humidity intake operation
Insulated airflow sectors — physically separate process and reactivation airstreams to prevent cross-contamination of dry process air with humid reactivation exhaust
Differential air pressure switch — monitors airflow continuously and triggers alarm or controlled shutdown if filter blockage or blower failure reduces flow below threshold
Safety thermostat — protects reactivation heater from overtemperature during 24/7 continuous-duty operation
Reactivation cooldown sequence — cools the heater element after shutdown before full stop, extending heater life in continuous-duty applications
Auto/manual operating modes — auto for humidistat-controlled cycling; manual for scheduled or fixed-rate drying operations
Multiple mounting configurations — floor-standing, wall-mounted, or duct-inline installation to suit mechanical room constraints
MP-350 Applications and Environments
Pharmaceutical manufacturers deploy the MP-350 in tablet coating rooms, active pharmaceutical ingredient (API) processing areas, and packaging lines where moisture above 30–35% RH causes hygroscopic ingredients to absorb moisture, clump, and degrade. Cold storage facilities and refrigerated distribution centers use it in staging areas and loading docks where low ambient temperatures make refrigerant dehumidifiers ineffective — the desiccant rotor operates normally at temperatures well below freezing. Electronics manufacturers and defense depot maintenance facilities specify desiccant dehumidifiers in circuit board assembly and component storage areas to prevent corrosion and electrostatic discharge failures driven by surface humidity. Museum collections, archival libraries, and document preservation vaults use the MP-350 for continuous humidity management where paper, film, and artifact materials require stable low-humidity conditions year-round.
Desiccant vs. Refrigerant: Technology Selection Criteria
Refrigerant and LGR dehumidifiers cool process air below its dew point to condense moisture onto evaporator coils. As ambient temperature drops, the coils must cool further; below approximately 45–50°F they ice over and trigger defrost cycles that interrupt dehumidification. Below 35°F, most refrigerant units cease effective operation. The MP-350's desiccant rotor adsorbs moisture through a chemical process with no icing threshold — it operates from sub-freezing temperatures through 140°F and can drive relative humidity well below the 40–45% RH floor that limits LGR equipment. The MP-350 operates on three-phase 208–240V or 460/480V 60Hz power and the reactivation exhaust — warm and moisture-laden at 117 CFM — must be ducted to the building exterior. Returning that exhaust to the conditioned space eliminates the dehumidification effect entirely.
Why does the MP-350 require three-phase power when the MP-100 and MP-175 run on single-phase?
At 350 CFM process airflow, the MP-350's blower and reactivation heater draw more electrical load than single-phase circuits can efficiently deliver at commercial amperage. Three-phase power — available at 208–240V/3-phase or 460–480V/3-phase, 60Hz — balances the load across three legs and operates the unit at lower per-leg current draw, reducing heat buildup in the wiring and improving motor efficiency. Facilities without three-phase service will need to evaluate transformer or phase converter options before specifying the MP-350.
How does the MP-350's 11.7 lbs/hr moisture removal rate compare to LGR dehumidifiers at the same CFM?
LGR dehumidifiers at 350 CFM may remove similar amounts of moisture at warm temperatures (70–80°F, 60% RH), but their removal rate drops sharply as temperature falls. At 50°F the typical LGR removes roughly 40–50% of its rated capacity; below 40°F most cannot operate effectively. The MP-350 maintains its 11.7 lbs/hr rate across the full operating temperature range from sub-freezing through 140°F, making it the correct choice for cold environments and applications requiring a humidity floor below 40% RH.
What is the minimum relative humidity the MP-350 can achieve?
The MP-350 can reduce relative humidity well below the floor achievable with refrigerant equipment — below 10% RH is achievable under favorable inlet conditions. The actual minimum depends on inlet air temperature and humidity, process airflow, and reactivation heat input. For specific performance curves at your target temperature and humidity conditions, request engineering data from Bry-Air before finalizing sizing.
Does the reactivation exhaust from the MP-350 need to be ducted to the building exterior?
Yes. The MP-350's reactivation airstream carries the moisture extracted from the process air and exits as 117 CFM of warm, humid exhaust. This exhaust must be routed to the building exterior through a duct penetration. Dumping the reactivation exhaust back into the conditioned space returns the extracted moisture and negates the dehumidification effect. Account for the 117 CFM exhaust volume in the building's ventilation balance calculation.
Can the MP-350 be installed inline with an existing HVAC duct system?
Yes. The MP-350 supports duct-inline installation in addition to floor-standing and wall-mounted configurations. In inline service, the unit treats supply or return air from the AHU as its process air stream. Verify that the existing duct system can accommodate the MP-350's 0.90" wc process external static pressure — insufficient duct static capacity will reduce effective airflow through the desiccant rotor and degrade moisture removal performance.
What does the differential pressure switch do if the process filter becomes clogged?
If the process filter becomes clogged and airflow drops below the MP-350's minimum operating threshold, the differential pressure switch detects the reduced pressure differential and triggers a fault alarm or controlled shutdown. This prevents the reactivation heater from running without adequate airflow — a condition that can cause overtemperature and heater damage. In unattended installations, the alarm notifies facility personnel of a filter maintenance condition before equipment damage occurs.
How is the MP-350's desiccant rotor maintained in the field?
The MP-350's desiccant rotor is water-washable and can be removed and rinsed on-site with clean water to clear accumulated dust and particulate without chemical cleaning agents. The stainless steel flange resists corrosion during the wash process. Bry-Air recommends following the specific rotor wash procedure in the installation and maintenance manual to avoid disturbing the desiccant matrix coating during cleaning.
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