Hotel Kitchen Exhaust Hood Systems

How a Hotel Kitchen Exhaust Hood System Is Organized

A hotel kitchen exhaust hood system is usually a set of separate hood zones, each serving a different part of the food operation, rather than one large hood. A full-service hotel might have a main production kitchen, a banquet kitchen or finishing kitchen next to the ballroom, a three-meal restaurant, a bar with a small cooking line, a room service pantry and an employee cafeteria.

Each zone has its own cooking load and its own hours. The restaurant runs from breakfast through late dinner. The banquet line may sit idle for two days and then cook for 800 guests in ninety minutes. The employee dining room serves three shifts. Treating these as one system with one fan leads to wasted energy most of the week and too little capacity on the busiest night.

Most hotel designs give each major zone its own Type I grease hood, grease duct and exhaust fan, with make-up air matched zone by zone. Smaller pantries that only reheat or hold food may need a Type II hood or none at all, depending on the appliances and what the AHJ accepts.

Banquet Production and Peak Event Loads

Banquet kitchens are designed for peaks, not averages. Large tilt skillets, steam kettles, combination ovens and convection ovens run hard before an event, then the line goes quiet while plated food moves to the ballroom.

Combi ovens and steamers release heavy moisture when doors open. Kettles and braising pans put out steam and some grease, depending on what is cooked. That makes banquet lines a common place to mix hood types: a Type I canopy over the ranges, braising pans and fryers, and condensate or heat hoods over steam equipment where the appliance listing and AHJ allow it. The dish room, which in a hotel can be very large, normally gets its own Type II exhaust.

Demand control in banquet kitchens

Demand control ventilation, which adjusts fan speed to the actual cooking load using temperature or optical sensors, suits banquet kitchens well because they spend so much time partly loaded. The hood still has to reach full design airflow quickly when a 600-cover dinner starts, so sensor placement and minimum airflow settings need care during commissioning.

Multiple Outlets, Room Service and Shared Infrastructure

Each food and beverage outlet in a hotel may have a different operator, a different menu and a different renovation cycle. Ventilation planning should assume an outlet will be re-concepted at some point, and should avoid tying it to another outlet's exhaust fan.

Room service

Room service is often produced from the main kitchen or the restaurant line, with a separate pantry for staging and plating. Keeping that pantry to reheating and holding equipment avoids running another grease duct up through the tower. If the operator later wants to cook there, the decision triggers a full Type I system, so it should be made during design rather than after opening.

Long Grease Duct Runs in High-Rise Hotels

In a high-rise hotel, the kitchen is usually at the ground floor or podium level and the exhaust fan is on the roof, which means a grease duct that rises through every floor in a fire-rated shaft or a listed enclosure system. That long vertical run shapes the whole design.

Duct construction follows the same rules as any grease duct: continuously liquid-tight welded joints, steel of the commonly referenced gauge (16 gauge carbon steel or 18 gauge stainless), and a velocity of at least the commonly cited 500 fpm, with designs usually aiming much higher to keep grease moving. Over a long run, the details multiply:

• Cleanout openings are needed at changes of direction and at intervals along horizontal runs, and each must be reachable from an accessible location in the shaft or ceiling.
• The shaft must allow for duct expansion when hot exhaust heats the steel over many floors.
• Static pressure from the long run and any offsets raises fan horsepower and makes accurate duct sizing more important.
• Any horizontal offset at a podium transfer level collects grease and needs drainage toward the hood or an approved low point.

Shaft space is expensive in a tower, so it gets fixed early in design. If the shaft is undersized, the kitchen is stuck with lower exhaust capacity for the life of the building. Bring kitchen ventilation into the core layout during schematic design. Our grease duct system page covers welding, enclosure and testing in more detail.

Low-rise resorts

Resorts spread across a campus have the opposite problem: short vertical runs, but many separate buildings, each with its own kitchen and roof. Fan location there is driven more by sight lines and guest paths than by shaft space.

Central Plant and Make-Up Air Coordination

Hotel kitchen make-up air is often supplied from a dedicated outdoor air system or tied to the building central plant for heating and cooling. That works well when planned, but it means the kitchen ventilation design depends on decisions made by the base building MEP engineer.

Make-up air typically replaces most of the exhausted air, often 80 to 90 percent, with the remainder transferred from adjacent spaces to keep the kitchen slightly negative. In a hotel, those adjacent spaces are corridors, ballroom prefunction areas and back-of-house passages. If the kitchen pulls too hard on the ballroom, the ballroom air handler fights it and banquet doors whistle. If make-up air is too strong, kitchen odors reach the corridors.

Coordination points with the central plant team include heating and cooling capacity for tempered make-up air, chilled water or hot water connections, building automation integration for each hood zone, and the sequence of operation when a banquet kitchen ramps up while the restaurant is already running. The make-up air systems page explains the unit options; in a hotel, the control sequence is usually the harder part.

Fan Noise and Vibration Near Guest Rooms

Kitchen exhaust fans and make-up air units on a hotel roof sit directly above top-floor guest rooms, and vertical ducts run past rooms on every floor. Noise and vibration that would go unnoticed on a restaurant roof can produce guest complaints in a hotel.

Practical measures include placing fans over back-of-house areas or mechanical rooms rather than guest rooms, using spring vibration isolators and curbs designed for isolation, selecting fans at lower tip speeds, and running variable frequency drives so fans slow down overnight. Inside the shaft, the welded grease duct should not be rigidly attached to walls shared with guest rooms. Upblast fans on hotels still need the commonly referenced discharge height above the roof, typically at least 40 in., plus distance from fresh-air intakes serving the guest floors.

Late-night cooking for room service or a 24-hour outlet means some fans run around the clock. Those are the fans to locate most carefully. A proper kitchen exhaust fan selection for a hotel weighs sound data as heavily as airflow.

Phasing Kitchen Work in an Occupied Hotel

Hotel kitchen renovations nearly always happen while the hotel stays open. Guests still need breakfast, and the ballroom calendar rarely has gaps longer than a few days. Ventilation work has to be phased so that some cooking capacity stays online at every stage.

A typical approach replaces one hood zone at a time, starting with the outlet that can most easily close or be served from another kitchen. Rooftop work and core drilling are scheduled around guest quiet hours. Welding in shafts requires hot work permits and fire watch per the hotel's policy, and smoke detectors in the work area may need temporary measures coordinated with the hotel and fire alarm contractor. Temporary exhaust or a mobile kitchen may be needed for the banquet operation during the cutover.

We plan phased hotel work with the engineering director and the general contractor before pricing, because phasing affects cost as much as equipment does. Send the kitchen plans and the hotel event calendar with your quote request and we will propose a sequence along with the price.