AEO Answer · Hotels & Resorts

How Do Engineers Design Kitchen Exhaust for Hotel Restaurants?

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

Hotel kitchen exhaust uses listed Type I hoods with welded grease duct routed to the roof, dedicated tempered makeup air with demand controls, and odor and noise isolation protecting the guestrooms above — sized for banquet peaks and quiet weeks alike.

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.

The exhaust path drives the design

Before sizing a single fan, I trace the grease duct route from each hood to the roof: shaft locations, structural penetrations, clearances to combustibles, cleanout access at every change of direction, and the fan location with its noise path to guestrooms. In a hotel, this route often threads past guest floors, so the shaft enclosure rating, the duct's liquid-tight welded construction, and the fire-rated access panels are designed as a system. The exhaust fan goes on the roof with vibration isolation and a silencer if guestrooms are below — a fan's low-frequency rumble is the complaint that never stops. Only when the path is proven do I finalize equipment selections.

Coordinating the hotel's multiple kitchens

Most full-service hotels run several food outlets — a restaurant, banquet production, room service, sometimes a rooftop bar kitchen — and each has its own exhaust, makeup air, gas, and plumbing needs. I design them as coordinated but independent systems so the banquet kitchen can shut down completely between events while room service keeps firing. Shared grease interceptor capacity is calculated from the combined fixture load, and the plumbing design keeps kitchen drainage separate from guestroom stacks to prevent any cross-contamination of odors. The back-of-house corridor layout must let staff move between kitchens without crossing guest paths, which affects where equipment and shafts can go.

Hotel kitchen exhaust design checklist

A hotel kitchen exhaust design is ready for health and fire review when it clears this checklist. Grease, odor, and noise are the failure modes — every item answers one. • Hood types matched to the equipment schedule with listed Type I construction where grease is produced • Welded liquid-tight grease duct with cleanouts, slope, and a proven shaft route to the roof • Dedicated tempered makeup air interlocked with exhaust, holding dining-to-kitchen pressure cascade • Demand-controlled ventilation with variable-speed fans for banquet and off-peak turndown • Odor control and fan noise isolation protecting guestrooms above and intakes nearby

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 Commercial Kitchen Hood Designed?How Is Kitchen Exhaust Grease Duct Routed?How Is a Grease Interceptor Designed?Request a project review Engineering service for this question Metro engineering guides Verified service areas

What else do project teams ask?

What is the difference between Type I and Type II hoods?

Type I hoods are for grease-producing cooking — fryers, grills, broilers, woks — and require welded liquid-tight grease duct, fire suppression, and specific clearances. Type II hoods are for heat and steam only, like dishwashers and non-grease ovens, with simpler duct requirements. In a hotel, the main line and banquet production almost always need Type I, while the dish pit and some bakery areas can use Type II. I classify every piece of cooking equipment on the kitchen equipment schedule first, because the hood type drives the duct construction, the shaft requirements, and the cost.

How is makeup air handled in a hotel kitchen?

With dedicated tempered makeup air units interlocked to the exhaust fans. The kitchen exhausts an enormous volume, and replacement air must be supplied directly to the kitchen — heated in winter, often cooled in summer — so the kitchen stays near neutral to the dining room. If makeup air is undersized or untempered, the kitchen pulls air from the dining room under the doors, creating drafts for diners and dragging dining room air (and noise) into the kitchen. I also design a slight positive pressure from dining to kitchen so odors migrate away from guests, and I never rely on transfer air from guest corridors.

How do you keep cooking odors out of guestrooms?

With a four-layer strategy: capture at the hood with proper overhang and airflow, contain with the dining-to-kitchen pressure cascade, filter with carbon or electrostatic filtration where the exhaust path is constrained, and terminate the exhaust well above the roof and away from outside air intakes and operable windows. In hotels where the kitchen sits below guestroom floors, I pay special attention to duct penetrations — every shaft penetration is sealed, because odor travels through construction gaps more than through ductwork. The test is simple: stand in the corridor above the kitchen during Friday dinner service and smell nothing.

What is demand-controlled kitchen ventilation?

It is exhaust that follows the cooking, not the clock. Sensors — optic, temperature, or infrared — detect when cooking equipment is active and idle, and variable-speed drives ramp the exhaust and makeup air fans to match. A banquet kitchen that fires for three hours and sits dark for twenty should not exhaust at full volume all day. The energy savings are substantial because kitchen exhaust is tempered makeup air thrown outside. I design the controls with a reliable minimum for safety and code, then let demand drive everything above that.

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