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Commercial · Bakeries & CafésBakery & Café HVAC — Oven Heat, Hoods & Make-Up Air
Bakery and café HVAC comes down to oven heat, hoods and make-up air, in that order. Ovens that give off only heat and steam (deck, rack and convection ovens baking bread and pastry) can usually sit under a Type II heat-and-vapour hood, while anything producing grease-laden vapour, such as a doughnut fryer or a griddle, needs a Type I grease hood with fire suppression. That one decision changes the cost of the hood, the duct and the make-up air more than any other choice in the build.
The hood type follows from what is cooked under it. NFPA 96, which the Ontario Building Code points to for commercial cooking exhaust, applies to equipment that produces grease-laden vapours: that means a listed Type I hood with grease filters, a liquid-tight welded duct, a fire-suppression system and an upblast fan. A Type II hood is lighter sheet metal with ordinary ductwork and no suppression, built to carry away heat, steam and odour. The building department decides from your equipment list, so the list has to be complete on day one.
Exhaust is only half of it, because every cubic metre the hood removes must come back in. A Type I hood running at grease exhaust rates normally needs its own gas-fired make-up air unit. A Type II hood over ovens moves less air, and in a small shop the replacement air can sometimes come through the rooftop unit's outdoor-air intake if the unit was selected for it. When doors pull hard or the hood spills heat at the front edge, the fix is kitchen exhaust and make-up air balancing.
Bakeries carry their peak load before the sun is up. Deck and rack ovens are lit hours before opening and radiate into the room through the whole bake, then the front fills with customers while the ovens are still hot. Cooling sized by floor area for a retail unit will fall short. It has to be sized for the oven heat that escapes the hood, the proofers and the people together, and a working economizer helps, since 4 a.m. outdoor air is the cheapest cooling a baker will ever get.
Flour changes the maintenance schedule. Airborne flour loads a filter in weeks, and whatever passes the filter lands on a wet cooling coil and sets like paste, which cuts airflow, freezes the coil and plugs the drain pan. In a production bakery, check filters monthly and change them when loaded, and keep return grilles away from the mixer and the bench. A scheduled commercial filter change service costs less than one frozen coil in July.
Small cafés have the opposite problem: one rooftop unit serving both the kitchen and the seating. An espresso machine holds a boiler at temperature all day, a proofer releases warm wet air each time it opens, and display coolers reject their heat into the room. On humid days near Lake Ontario that moisture shows up as a fogged pastry case. Full cook lines belong on the restaurant HVAC page; for a bakery or café, describe your equipment to us and we will start from the oven list.
Equipment we install and service
A Type II canopy over deck, rack and convection ovens, or a Type I grease hood where frying or griddling is on the menu. Gas ovens also have to vent their combustion products the way the manufacturer's certified instructions require, which is checked against the hood design before anything is ordered.
A dedicated gas-fired unit for larger exhaust rates, or added outdoor air through the rooftop unit for small Type II hoods. It is interlocked with the exhaust fan so one never runs without the other.
Packaged cooling and heating sized for oven and equipment heat plus customers, ideally zoned so the bake room and the seating area are not sharing a thermostat. The thermostat goes on the seating side, away from the espresso machine and the oven wall.
Local exhaust or added dehumidification where proofers, steam-injected ovens and dish machines release moisture. Staging and fan-speed settings on the rooftop unit are adjusted so it runs long enough to dry the air instead of short-cycling.
What goes wrong in these buildings
- The bake room is past 32°C by six in the morning and my staff are finished by nine.
- Customers at the front tables feel a draft whenever the oven hood is on.
- The rooftop unit iced up again and the filter was white with flour.
- The inspector wants to know why there is a fryer under a hood with no suppression.
- The pastry case fogs and the croissants go soft on humid days.
- The front door is hard to pull open whenever the ovens are running.
How it works
Ovens, proofers, fryers, espresso machines, dish machine and display coolers, each with fuel, input rating and hours of use. That schedule drives the hood type, the exhaust rate, the replacement air and the cooling load.
The equipment list goes to the building department with the hood selection, and exhaust and make-up air are designed as a pair. If fried items may be added later, we price the Type I route now so the choice is made with both numbers on the table.
Bakeries start before dawn and wind down after lunch, so installation and service are booked for afternoons and evenings when the ovens are cold. Filter and coil visits are set by how much flour is in the air, not by the calendar.
Common questions
Does a bakery oven need a hood in Ontario?
In most cases, yes. Gas ovens must vent combustion products as their certification requires, usually under a canopy hood or through a direct flue. Electric ovens produce heat and steam that most building departments expect to see captured by a Type II hood or handled by designed ventilation. Some small electric ovens are listed for use without a hood, and the building department has the final say.
How often should a bakery change its HVAC filters?
Check monthly and change when the filter is visibly loaded, which in a production bakery is far sooner than the quarterly schedule an office follows. Flour that passes a clogged or bypassed filter cakes onto the cooling coil. Have the coil and drain pan cleaned at least once a year, before cooling season, and more often if the mixer is near a return grille.
Can one rooftop unit serve the kitchen and the seating area?
In a small café with light exhaust, yes, provided the air is balanced so the kitchen sits slightly negative to the seating and odours move toward the hood. In a bakery with deck or rack ovens, no: the bake room load swamps the unit and the front freezes or bakes with it. Rule of thumb: once the ovens need a hood, give the bake room its own zone.
We are adding doughnuts or other fried items. What changes?
Almost everything above the fryer. Frying produces grease-laden vapour, so the equipment needs a Type I hood, grease filters, a welded grease duct, a fire-suppression system and a higher exhaust rate, which in turn means more make-up air and a check of gas capacity. It also needs a permit. Sort this out before buying the fryer, not after the inspector sees it.
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