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Commercial · Bars & BreweriesBar & Brewery HVAC — Ventilation, Cooling & Patio Heat
Bar and brewery HVAC is four separate air problems under one roof: kettle steam, carbon dioxide from fermentation and kegs, a taproom packed with standing people, and a patio that needs gas heat from October on. A brewery HVAC contractor handles the ventilation, the make-up air, the cooling and the gas; the glycol chiller, keg cooler and draught lines are refrigeration, and ZK Mechanical does not work on them. The decision rule is short: if it moves air or burns gas, call us, and if it chills beer, call your refrigeration firm.
A brew day puts a large amount of water vapour into the building during roughly an hour of boil. The kettle either vents that steam through a dedicated stack to the roof or condenses it in a condensate stack, which sprays cold water into the vapour and sends it to a floor drain. A roof stack needs the right slope, a drip leg so condensate does not run back into the wort, and a material rated for wet vapour; a condensate stack needs no roof opening, but it uses water on every brew. If the kettle is direct-fired with gas, the burner flue is a separate vent from the steam stack and falls under CSA B149.1, Ontario's natural gas and propane installation code.
Carbon dioxide is the hazard owners underestimate. Fermenters release it through their blow-off, bulk tanks and keg rooms can leak it, and because it is heavier than air it settles at floor level in cellars, walk-in keg rooms and pits. Ontario's workplace exposure limit is 5,000 ppm averaged over a shift, so fermentation and keg rooms get a fixed CO2 monitor mounted low on the wall and wired to an alarm, and where the room allows it, to an exhaust fan that pulls from near the floor. We install and service that exhaust and the make-up air unit that replaces what it removes; the gas supplier or a detection specialist normally calibrates the sensor itself.
Wash-down is the other brewhouse load. Hot caustic and rinse water on a sloped floor turns the room into a steam bath, and without exhaust that moisture ends up on ceiling steel, electrical panels and cold glycol lines, where it drips. On the public side, a taproom carries far more people per square metre than the retail unit it replaced, mostly standing, late into the evening, with a garage door or patio doors rolled open whenever the weather allows. A rooftop unit cannot hold a room that is open to the street, so we fit a door-switch lockout or a raised setpoint for open-door hours instead of letting the compressor run flat out against July air off Lake Ontario.
Gas patio heaters extend the season, and they are gas appliances, not furniture. Fixed natural gas infrared heaters are piped and mounted to the clearances on their rating plate, which CSA B149.1 makes binding, and those clearances apply to umbrellas, awnings, pergola roofs and vinyl enclosure walls as well as the building. Portable propane heaters are certified for outdoor use only and their cylinders are stored under CSA B149.2 rules, which is why a tented winter patio usually needs a different heater than the one already standing on it. For food-side exhaust see restaurant HVAC, for the overview see commercial HVAC, and to have a brewhouse or patio looked at, contact the shop.
Equipment we install and service
The stack that carries boil vapour out of the brewhouse, or the water-spray condenser that sends it down the drain. We check slope, drip legs, roof flashing and the damper, and on direct-fired kettles we inspect the separate burner flue and its combustion air.
Wall or roof exhaust fans sized for wash-down humidity and CO2 dilution, with low-level pickup in keg and fermentation rooms. Whatever goes out is replaced with tempered make-up air so the taproom door does not become the intake.
Packaged gas-heat, electric-cool units carrying a dense standing crowd. Outdoor-air settings, economizer dampers and coil condition decide whether the room holds temperature on a full Saturday, and a door-switch lockout keeps the unit from trying to cool the patio.
Overhead natural gas infrared heaters on a dedicated line with its own shut-off, or portable propane units. We pipe, mount and commission the fixed type to rating-plate clearances and check regulators, hoses and igniters on both at the start of the season.
What goes wrong in these buildings
- The taproom fills with steam every brew day and the ceiling tiles above the kettle are stained.
- My CO2 alarm in the keg room went off twice last month and nobody knows who is supposed to look at it.
- By ten on a Friday the bar is shoulder to shoulder and the air conditioning has given up.
- We roll the garage door up in June and the rooftop unit runs until it ices over.
- The patio heaters light, burn for a minute and drop out.
- An inspector asked how far the heater is from the awning and I had no answer.
How it works
We walk the brewhouse, cellar, taproom and patio as four zones and list what each one exhausts, supplies and burns. Glycol, keg cooling and draught equipment are noted as refrigeration and left for that contractor.
Steam stack faults, missing low-level exhaust, starved gas appliances and patio heater clearances are dealt with before comfort cooling. Gas piping and appliances are installed by TSSA-licensed gas technicians, with a permit through the municipal building department where the work needs one.
Outdoor air, schedules and door lockouts are set for your real busy hours, including late close. You get a written list of what was measured, what was changed and what is still outstanding.
Common questions
Do you service glycol chillers, keg coolers or draught lines?
No. Glycol chillers, walk-in keg coolers, draught lines and trunk lines are refrigeration and beverage-system work, and they need a contractor who does that every day. We handle heating, cooling and ventilation air, make-up air and gas piping. If a warm keg room turns out to be an airflow or heat-rejection problem in the space around the condensing unit, we will say so and fix that part.
Do I need a CO2 monitor in my fermentation or keg room?
If CO2 is stored, piped or produced in a closed room, plan on one. The gas is odourless, heavier than air and pools at floor level, so the sensor is mounted low and tied to an audible alarm outside the door. Your CO2 supplier, your insurer and the fire department set the details. We provide the low-level exhaust and make-up air that the alarm triggers.
Can I use my propane patio heaters inside a tent or enclosed patio?
Not the portable mushroom type. Those are certified for open outdoor use, and running them under a closed tent or inside plastic patio walls traps combustion products and breaks the clearances on the rating plate. Enclosed patios are normally heated with fixed heaters certified for that use on a piped gas line. Tell us how the patio is enclosed and we will quote what is allowed.
Kettle steam: roof stack or condensate stack?
A roof stack costs more to install because it means a roof penetration, flashing and often the landlord's roofer, but it uses no water. A condensate stack installs quickly in a leased unit and avoids the roof, at the cost of cold water and a floor drain on every boil. In a plaza unit where the landlord restricts roof openings, the condensate stack usually wins.
Related
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