Bry-Air MiniPAC MP-350 Desiccant Dehumidifier – 350 CFM, 11.7 lbs/hr, 3-Phase

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.

Documents

MiniPAC MP-350 Overview