Irvine Kitchen Hood Cleaning services commercial kitchen make-up air units in Irvine, CA and the surrounding cities including Tustin, Costa Mesa, Garden Grove, Westminster and Fountain Valley. Make-up air replaces the air your exhaust fan removes, and California requires it to be provided at the rate exhausted. It is the half of the system nobody calls about.
The reason it goes unnoticed is that make-up air has no symptom of its own. It is only ever felt second-hand: the kitchen runs hot, the back door becomes hard to pull open, the hood stops capturing cleanly, and smoke rolls out over the line from a system whose exhaust fan is working perfectly. Every one of those reads as an exhaust problem, and none of them is.
That is also why it is worth having the same crew on both sides. We are already on the roof for the exhaust fan, and the supply unit is usually a few feet away, unserviced, with filters nobody has looked at since it was commissioned.
What Goes Wrong on the Supply Side
Negative Pressure and What It Feels Like
When a kitchen exhausts more than it replaces, the building goes negative and pulls air through whatever gaps it can find. Doors get heavy, sometimes to the point of being genuinely hard to open. The hood loses capture at the edges because the air it needs is no longer arriving from in front of it. Staff adapt to all of this rather than reporting it.
Filters, Coils and Blocked Intakes
Make-up air units have filters that load, intakes that collect debris, and coils that foul, and each of those reduces the volume of air the unit can actually deliver. A unit that is running is not necessarily a unit that is supplying, and nothing in the kitchen indicates the difference. This is the most common finding and the cheapest to correct.
Belts, Motors and Controls
The supply fan has the same wear items as the exhaust fan and gets a fraction of the attention. Belts glaze and slip, motors fail, and controls drift out of the sequence they were commissioned in so the unit runs at the wrong time or not at all. Interlocks between the exhaust and supply sides are worth verifying rather than assuming, since a supply fan that no longer starts with the exhaust fan produces exactly the symptoms of a unit that has failed outright while testing perfectly on its own.
Servicing It Alongside the Exhaust
One Visit, Both Sides of the System
Because we are already on the roof with the exhaust fan lifted, servicing the supply unit in the same visit avoids a second mobilization and a second access arrangement. It also means somebody is looking at the two halves as one system rather than as two vendors’ worth of separate problems, which is how a balance issue survives for years.
Filters and Consumables on a Cycle
Make-up air filters are consumables and they load faster in a kitchen environment than the schedule they were sold with usually assumes. Putting them on the same cycle as the exhaust cleaning gives them an owner. Left to a general facilities schedule, they are among the first things to slip when a building changes managers.
Checking the Balance, Not Just the Unit
A unit in good condition can still be delivering the wrong volume for a kitchen whose exhaust has changed since commissioning — a bigger fan, a new appliance, a remodel. Checking that the supply matches what is actually being exhausted is a different question from checking that the unit works, and it is the one that explains the symptoms.
When the Symptoms Point Elsewhere
Diagnosing Before Replacing Anything
A hood that has stopped capturing has three plausible causes on the supply side, the exhaust side and in between, and they present identically from the kitchen floor. We check filters, duct loading and the exhaust wheel before anyone quotes equipment. Replacing a make-up air unit that was never the problem is an expensive way to discover the fan wheel was packed with grease.
Health Code and Ventilation Adequacy
Environmental health inspectors look at ventilation adequacy under the California Retail Food Code, which is a different question from the fire code’s interest in grease. A kitchen that cannot hold temperature or clear smoke can attract attention from that direction entirely independently of its cleaning schedule. The supply side is usually what decides it.
Comfort, Retention and the Things Nobody Logs
Kitchens that run hot lose staff, and a line that is uncomfortable to work is a business problem before it is a compliance one. Make-up air is the single biggest lever on that, and it is almost never on anybody’s maintenance list. It is worth raising precisely because nobody else will, and because the fix is frequently a filter change rather than the equipment replacement people brace themselves for.
- 20+ Years in Orange County
- Overnight & Between Services
- Photographed to Bare Metal