
PSI Refrigeration Inc. delivers professional engineering, installation, and repair for commercial Make-Up Air Units (MAU) across Los Angeles and Orange Counties. When heavy-duty grease hoods exhaust massive volumes of air, a precision-tuned supply system must replenish it. We specialize in configuring high-efficiency supply air fans, commercial evaporative swamp coolers, and advanced Breezair units to bring clean, fresh, conditioned outdoor airflow straight into your kitchen cooking line—keeping your facility pressurized, your energy costs low, and your staff comfortable.
A commercial kitchen cannot function efficiently without balanced atmospheric pressure. If your exhaust hoods run without adequate makeup air, your building develops a vacuum—making front doors incredibly heavy to pull open, creating strong drafts, and pulling odors into the dining room. Our certified technicians service and calibrate your supply air systems to guarantee perfect equilibrium, ensuring flawless door operation and total indoor climate control.
Traditional air conditioning systems struggle to keep up with intense cooking line heat economically. We install and service high-capacity industrial evaporative coolers and swamp coolers that cool raw outdoor air using water evaporation. Our comprehensive maintenance includes clearing clogged water lines, swapping out saturated cooling pads, inspecting float valves, and servicing blower motor assemblies to provide a continuous, cost-effective stream of chilled, fresh air to your hot zones.
For ultimate reliability and energy performance, we specialize in advanced Breezair cooling systems. Utilizing state-of-the-art axial fans and premium corrosion-proof polymers, Breezair units supply uncompromised, oxygen-rich fresh airflow while consuming a fraction of the electricity of standard mechanical refrigeration. From precision off-hours installation to urgent diagnostic repairs, we keep your premium ventilation assets working flawlessly to protect your bottom line.
Precision airflow management starts at the control box. We specialize in the advanced wiring, diagnostics, and programming of Variable Frequency Drives (VFDs) and electrical control systems for commercial Make-Up Air Units (MAU). Our technicians configure smart sensors and control panels that automatically ramp your supply air up or down to match your exhaust hood activity. By precisely balancing the electrical amp draws and motor speeds, we eliminate negative building pressure while protecting your facility from massive energy spikes.
Bringing fresh, chilled outdoor air into a hot commercial kitchen requires heavy-duty mechanical reliability. We provide turnkey maintenance, belt calibrations, and emergency pulley alignments for high-capacity industrial evaporative swamp coolers and premium Breezair systems. When a fan belt slips or a blower wheel becomes unbalanced, your air delivery collapses. Our fleet carries a robust inventory of fractional horsepower motors, high-RPM bearings, and industrial-grade drive belts to keep your fresh air supply moving continuously.

Managing large commercial properties or high-volume kitchens demands precision oversight of your roof membrane assets. We specialize in the deep-dive diagnostic inspection, air balancing, and structural care of rooftop Make-Up Air Units (MAU) and supply fans. Our technicians evaluate complete rooftop configurations to verify that your outdoor air intakes are positioned away from exhaust streams, clear of debris, and operating with perfect fan wheel alignment to ensure a seamless, non-disruptive flow of fresh air down into your building infrastructure.

True kitchen comfort requires a continuous, calculated cycle of fresh outdoor air to displace the intense heat and grease vapors rising off your cooking line. We integrate high-performance evaporative swamp coolers and fresh air supply plenums directly with your Type I grease hoods and Type II vapor hoods. By introducing conditioned, oxygen-rich air exactly where your exhaust line pulls it, we eliminate severe draft issues, protect your dining areas from negative pressure, and maintain strict compliance with local California mechanical codes.

Clean airflow is impossible without proactive filter and cooling pad maintenance. We provide expert preventative maintenance programs for industrial swamp coolers and premium Breezair systems, focusing heavily on the scale removal, water distribution, and filter changes your system needs. Saturated cooling media and clogged intake filters choke your supply fan motors, driving up energy costs and cutting your fresh air volume in half. We swap out worn components, clean water lines, and maximize filtration to keep your air clean and code-compliant.
Mechanical issues don’t wait for business hours, and neither do we. We provide 24/7 emergency repair services to keep your fresh air infrastructure operational through your busiest dining shifts. Utilizing precise diagnostic instruments like professional clamp meters, our technicians trace complex electrical faults inside your air handler control boxes. We rapidly analyze voltage drops, test magnetic contactors, troubleshoot variable frequency drives, and resolve electrical failures to restore your air supply before your kitchen conditions become hazardous.
The cooling capacity of an industrial swamp cooler relies entirely on the condition of its evaporation pads. We supply and install premium, rigid evaporative cooling media engineered for maximum thermal efficiency and water retention. Replacing old, crushed, or mineral-choked pads with advanced, high-airflow blue cooling media prevents restrictions in your fresh air stream. This targeted upgrade slashes energy draws, prevents water carry-over into your ductwork, and ensures maximum temperature reduction across your hot cooking line.
When older air supply infrastructure becomes uneconomical to constantly repair, we execute clean, turnkey equipment changeouts. We configure side-by-side rooftop ventilation layouts, specializing in ultra-reliable Breezair cooling systems and industrial swamp coolers. Our mechanical team manages the entire process—including structural curb adaptation, water line configuration, and final air-balancing verification. Upgrading to advanced, corrosion-proof fresh air units guarantees steady building pressure and massive utility savings for your commercial property.
A Makeup Air Unit (MAU) is a dedicated ventilation system that pulls fresh, raw outdoor air into your building to replace (or "make up" for) the massive volume of air exhausted by your commercial kitchen grease hoods. Without an MAU, your kitchen exhaust fan will continuously starve for air, causing severe drafts, extreme heat buildup, and dangerous structural imbalances.
This is the classic symptom of negative building pressure. When your heavy-duty Type I exhaust hoods pull thousands of cubic feet of air out of the building, but your makeup air system is broken or turned off, it creates a powerful indoor vacuum. This vacuum seals your doors shut, forces your HVAC system to short-cycle, and can actively pull vehicle exhaust or dumpster odors directly into your dining area.
While both utilize water evaporation to cool hot outdoor air, standard commercial swamp coolers use traditional belt-driven blower wheels and basic wood-aspene cooling pads that require frequent seasonal maintenance. Breezair cooling systems utilize advanced, direct-drive axial fans, corrosion-proof polymer casings, and premium rigid cooling media panels to supply maximum uncompromised fresh air with significantly lower electricity consumption and zero belt-slip issues.
Commercial evaporative coolers in high-volume environments should be professionally inspected and serviced quarterly. Because these systems continuously evaporate water to cool incoming hot air, mineral scale, algae, and airborne dirt rapidly accumulate inside the water tray and across the cooling pads. Regular service includes chemical flush cycles, float valve calibrations, water line clearing, and routine replacement of saturated cooling media to prevent fan motor burnout.
Yes, absolutely. Your facility’s ventilation and commercial refrigeration are deeply interconnected. When your makeup air supply fails, the resulting negative pressure will forcefully pull hot, humid kitchen kitchen air straight past the door gaskets of your walk-in coolers and freezers. This moisture instantly morphs into heavy frost on your evaporator coils, leading to ice-ups, poor product temperatures, and premature compressor failures while forcing your building AC units to run non-stop.
If your supply air fan is operating but blowing unconditioned, blistering hot air into your kitchen, your evaporative cooling infrastructure has completely lost its water cycle. This is typically caused by a seized water distribution pump, a completely clogged water line, a failed inlet float valve, or an electrical control fault. Our 24/7 technical fleet quickly diagnoses these components with precision multi-meters to restore immediate thermal comfort to your chefs.
PSI Refrigeration Inc. is a fully bonded, licensed, and certified commercial contractor(CA License #1102379, C-38 classification). Our certified service fleet targets high-volume commercial properties, restaurants, ghost kitchens, and facility management networks throughout Los Angeles County, San Fernando Valley, San Gabriel Valley and Orange County.
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