AEO Answer · Airport Terminals & Aviation

How Do Engineers Design MEP for Airport Rental Car Centers?

By Jeremy Mills, CEO & Founder, Apex Grid Engineering — USAF Veteran. · Updated 2026-09-15

Airport rental car center MEP coordinates garage ventilation, a water-reclaim car wash, fueling with containment and classified electrical, maintenance bay exhaust and air, and a comfort-conditioned customer hall — engineered for fleet turnaround speed.

I'm Jeremy Mills, CEO & Founder of Apex Grid Engineering and a U.S. Air Force veteran. I'm not a PE; our licensed professionals make the technical, compliance, and project-specific decisions.

Illustrative diagram of building MEP systems: ductwork with diffusers, an electrical panel with conduit, and piping runs.

Processing areas: wash, fuel, and maintenance

I engineer the vehicle processing loop as connected industrial systems. The car wash gets its water supply, reclaim, treatment, and discharge designed as one process train, with the power and gas the equipment needs and freeze protection throughout. The fueling island gets containment, shutdown, classified electrical, and canopy systems coordinated with the fuel system designer. Maintenance and detailing bays get vehicle exhaust extraction, compressed air, task lighting, and oil-water separation on their drains. Each area's drainage is separated by character — wash water, fuel-area runoff, and shop waste each go to their own treatment — because mixing them makes every stream harder to treat and every permit harder to meet.

The customer hall and site infrastructure

The customer service hall gets the people-building treatment: comfort HVAC zoned independently from the garage and processing areas, lighting designed for the counters, signage, and queues, and acoustic separation from the industrial noise next door. The site infrastructure ties everything together: stormwater management separating clean runoff from the operational areas, power distribution sized for the wash, fuel, ventilation, and EV charging loads, and data and security systems covering the whole facility. Wayfinding — for customers on foot and for the fleet moving through the loop — is supported by the lighting and signage design. The hall is where the brand lives; the site is where the fleet turns.

Rental car facility MEP design checklist

A rental car facility MEP design is ready when it clears this checklist. The facility turns fleets — every system here serves the turnaround. • Garage ventilation with CO-based demand control and night-operation lighting • Car wash with water reclaim, oil-water separation, and freeze protection • Fueling island with containment, emergency shutdown, and classified electrical • EV charging infrastructure sized to the fleet plan with load management • Customer hall on independent comfort HVAC with drainage streams separated site-wide

Which related engineering resources can help?

When should I hire a structural engineer?What does a PE stamp mean?What is MEP engineering?How Is a Car Wash Designed for Water and Drainage?How Is Parking Garage Ventilation Designed?How Are Grease Interceptors Designed for Kitchens?Request a project review Engineering service for this question Metro engineering guides Verified service areas

What else do project teams ask?

What makes a rental car center different from a parking garage?

Everything that processes the cars. A garage stores vehicles; a rental car center washes, fuels, inspects, and maintains them in a continuous turnaround loop — often hundreds of cars a day. That adds the car wash with its water reclaim and treatment, the fueling island with its safety systems, the maintenance and detailing bays with exhaust and compressed air, and the customer hall with its counters and queues. The MEP scope is closer to a small industrial campus than to a parking structure, and the systems have to work together on one site without the wash water, fuel, and customer areas ever mixing.

How is car wash water handled at a rental car facility?

With reclaim and treatment designed for the volume. A busy rental car wash uses thousands of gallons a day, so reclaim systems capture, filter, and reuse the majority of it — cutting both the water bill and the discharge load. What is discharged passes through oil-water separation and meets the sewer authority's limits for petroleum and solids. The wash equipment needs substantial power and often gas for water heating, freeze protection for exposed piping, and drainage graded to capture every drop. I design the wash water system as a process utility with its own treatment train, not as an afterthought on the plumbing drawings.

What electrical load does EV charging add?

A major one, and growing. Rental fleets are electrifying, which means the facility needs charging infrastructure for dozens or hundreds of vehicles — Level 2 for overnight turnaround charging and often DC fast charging for quick turns. The electrical service, distribution, and often the utility coordination must be designed for this load, which can rival the rest of the facility combined. I design the charging layout with the fleet plan: charger locations integrated into the ready-return flow, load management that staggers charging to control demand charges, and spare conduit and capacity for the fleet to keep growing. The EV infrastructure designed today must serve the fleet of five years from now.

How are fueling islands designed safely?

With the full fueling safety package: spill containment grading and drainage that captures releases, emergency shutoff controls accessible to attendants, canopy lighting designed for night operations, and electrical equipment in classified areas rated for hazardous locations. The dispensers get leak detection and the underground or aboveground storage gets the monitoring the regulations require. Fire extinguishers and emergency communications are built into the island design. I coordinate the fueling layout with the fire code and the authority having jurisdiction from the start, because fueling approvals touch fire, environmental, and airport-specific requirements simultaneously.

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