What to Know Before Upgrading Your Commercial Kitchen Exhaust System

Running a high volume restaurant demands incredibly robust infrastructure behind the scenes. When your kitchen environment is choked with smoke, grease, and excessive heat, employee turnover spikes and food quality suffers. At Lazzaro Gas HVAC, we partner with local hospitality owners to engineer ventilation solutions that keep their culinary teams safe and productive. Upgrading your exhaust canopy is a massive undertaking that requires precise coordination between multiple trades.

Many restaurateurs jump into a ventilation upgrade without understanding the complex relationship between outgoing smoke and incoming fresh air. Booking a commercial HVAC installation Whitby specialist ensures your new canopy meets stringent fire safety and health codes. We want to provide you with the critical knowledge needed to navigate this major facility improvement. Knowing what to prepare and what to ask will protect your investment and keep your doors open.

Guide Contents:

• Understanding Makeup Air Requirements
  
• How do I calculate the exhaust fan size for a commercial kitchen?
  
• Red Flags to Watch for When Hiring a Contractor
  
• Questions to Ask Before Committing to a Contract

Understanding Makeup Air Requirements

Pulling massive volumes of greasy smoke out of a building creates a powerful vacuum inside your kitchen. If you do not mechanically introduce fresh air back into the space to replace what was removed, your building suffers from negative static pressure.

• Door Slams: Negative pressure creates a vacuum that causes entry doors to slam shut forcefully and makes them incredibly heavy for customers to pull open.
• Poor Drafting: Without makeup air, the exhaust hood cannot pull the smoke upwards, causing grease and heat to spill out into the dining room.
• Heating Costs: Untempered makeup air pulled directly from the outside will freeze your kitchen staff in the winter, requiring integrated heating coils to warm the incoming air.

How do I calculate the exhaust fan size for a commercial kitchen?

Sizing an exhaust fan involves clinical mathematical formulas based on the total square footage of the cooking surface and the type of equipment sitting beneath the hood. A heavy duty charbroiler or wok requires a much higher cubic feet per minute rating than a standard convection oven. An engineer must calculate the thermal plume generated by each specific appliance, factor in the length of the ductwork running to the roof, and account for the resistance of the grease filters. Guessing this calculation leads to a hood that is either dangerously weak or unnecessarily loud and expensive to operate.

Red Flags to Watch for When Hiring a Contractor

Commercial ventilation is highly regulated, and cutting corners on safety protocols puts your entire business at risk of a catastrophic grease fire. You must be able to spot an unqualified provider before they touch your building.

• Ignoring Fire Suppression: If the contractor fails to coordinate the hood installation with a certified fire suppression technician, they are violating foundational fire codes.
• Using Standard Ducting: Exhaust hoods require fully welded, heavy gauge black iron or stainless steel ducts, not the thin galvanized sheet metal used for standard air conditioning.
• Vague Timelines: A provider who cannot give you a strict, hour by hour installation timeline does not respect the fact that downtime costs your restaurant thousands of dollars in lost revenue.

Questions to Ask Before Committing to a Contract

Protecting your commercial facility means interrogating the proposed design before you sign any agreements. You need absolute certainty that the new system will perform reliably during your busiest Friday night service.

• Ask About Access Panels: Will the new exhaust ducting feature clearly marked, grease tight access panels at every change of direction to allow for mandatory professional cleaning?
• Ask About Roof Load: Has a structural engineer verified that the roof decking can support the weight of the massive new upblast exhaust fan and makeup air unit?
• Ask About Noise Levels: What is the projected decibel rating of the new fan motor, and will it cause disruptive vibration inside the main dining room?

Optimizing Your Culinary Operations

Upgrading your kitchen exhaust infrastructure creates a safer, more productive environment for your entire culinary team. By addressing makeup air and vetting your contractor thoroughly, you ensure a flawless integration of your new heavy equipment. Reach out to our commercial engineering team today to review your kitchen blueprints and design a high performance ventilation strategy.