Hood Filter Cleaning in Hamilton
Hood filter cleaning is the removal of accumulated grease from the removable filters in a commercial kitchen canopy, the first barrier standing between the cook line and the duct. Hamilton Hood Cleaning degreases or soak-tank cleans each baffle filter, checks the bank for gaps that let grease bypass the filters entirely, and reports any warped frame or collapsed baffle that needs replacing instead of cleaning. Filters are the one part a kitchen can look after between visits, and the part that decides how fast everything downstream loads up.
What a filter is doing and what it is not
A baffle filter works by making the air change direction fast. Grease droplets are heavier than air, so when the airstream slams through the S-shaped channels the droplets cannot turn with it. They hit metal, condense, and drain down the baffle into the grease cup or trough. Air keeps going. Grease stops.
That mechanism explains everything else here. A filter loaded solid stops turning air properly, so capture drops and grease carries into the plenum. A gap beside a filter hands the airstream a straight path with no direction change at all, which is worse than a dirty filter.
This page covers the filters alone. The plenum cavity and canopy behind them are covered under hood vent cleaning, and the duct run and riser past that under kitchen exhaust cleaning. Clean filters slow both down. They never replace either.
Baffle filters vs mesh filters in a Hamilton kitchen
Mesh filters still turn up in older Hamilton kitchens, and under NFPA 96 they do not belong over a commercial cook line.
| Point of difference | Baffle filter | Mesh filter |
|---|---|---|
| How it catches grease | Forces the air to change direction so droplets strike metal and drain away. | Traps grease inside layers of woven metal, holding it in the airstream. |
| Behaviour in a flare-up | Drains, so there is less fuel sitting in the path of flame. | Holds saturated grease directly above the burners. |
| Standing under NFPA 96 | The listed, code-recognised choice for a Type 1 hood. | Not acceptable over commercial cooking equipment producing grease-laden vapour. |
| Cleaning | Degreases back to bare metal, channels visible again. | Rarely comes fully clean once grease has set inside the weave. |
| Service life | Years, until a frame warps or a baffle collapses. | Degrades quickly and deforms in the frame. |
| What an inspector does | Checks condition, fit, and whether the bank is complete. | Flags them for replacement with listed baffle units. |
If you are not sure which type of hood you have over your line, the Type 1 hood guide explains the distinction, and the free walk-through confirms it in person.
How a commercial hood filter actually gets cleaned
Hamilton Hood Cleaning cleans filters either in a heated soak tank or on site with a degreaser and hot rinse, and the choice depends on how loaded the bank is and how long the kitchen can spare the filters.
Soak tank. Filters come out of the bank, go into a heated alkaline solution, and sit long enough for the grease to release on its own. Baked-on carbon that no scrubbing shifts comes off this way. It is the better result and what a heavily loaded bank needs, but the filters are out of the kitchen for the duration.
On site. Filters are sprayed with a hot alkaline degreaser, given dwell time, agitated, then rinsed and drained. This is what happens on most scheduled visits, it fits the same overnight window as the rest of the service, and the bank goes back in before the kitchen opens.
The check matters as much as the wash. The bank is looked at whole: filters seated the right way up so they drain, no gaps at the ends, the trough emptied, and any unit that has lost a baffle or bowed in the middle pulled and reported. Kitchens under residential units on Locke Street South and Ottawa Street North get the on-site version overnight, since a tank collection run adds a second visit. Larger business park banks in Stoney Creek and Ancaster suit tank work better.
Which degreaser suits a greasy ventilation hood?
A hot alkaline degreaser is the right chemistry for cooking grease, because grease is a fat and alkali breaks fats down into something water can carry away.
Three things do the work and all three are adjustable: solution strength, temperature, and the dwell time before anyone touches it. Weak results almost always come from rushing the dwell rather than from the product. Grease needs a few minutes to give up.
What does not belong near a filter bank: acidic cleaners, which attack aluminium frames, and oven cleaner used as a general purpose spray, which is aggressive enough to mark stainless. Neither is faster, and both leave you explaining damage.
Keeping filters in shape between services needs nothing exotic: hot water, a commercial alkaline degreaser rated for kitchen use, real dwell time, and a rinse that clears the channels. Filters are generally not dishwasher safe, because the detergent and heat cycle can dull and pit aluminium. Anything past the filter face is a different job with confined space considerations, which is why the plenum and fan sit inside a scheduled service. Frequencies are on the NFPA 96 page.
How much does hood filter cleaning cost in Hamilton in 2026?
Hamilton Hood Cleaning includes filter cleaning in a scheduled service, which starts from $385 per visit for a single-hood kitchen up to ten feet and from $725 per visit for a multi-hood kitchen of two to four canopies. Campus, hospital, contract-catered and multi-tenant kitchens are quoted on site after a free walk-through. Filters are not sold as a separate visit, because cleaning them while leaving the plenum and duct loaded does not make a kitchen compliant.
What moves the number on the filter side is bank size and condition. Six filters on a moderate line is routine. A twenty filter bank on a high volume wok or fryer line takes real hours, and filters left long enough to carbonise take longer again. Replacements, where a frame has warped or a baffle collapsed, are quoted separately and never swapped in without approval. The variables behind the whole price sit on the cost guide, and how often the visit is due is in the frequency guide.
Next step: call 289-796-0840 or request a written quote. Count your filters, note what you cook, and say when the kitchen can spare them. The written number is back within 24 hours.
Hood filter cleaning in Hamilton: frequently asked questions
Do vent hood filters need cleaning on a regular schedule?
Yes. Filters load faster than any other part of the system because they take the grease first, so most Hamilton kitchens wash them weekly in house and have them properly degreased at every scheduled service. A high volume fried or charbroiled line often needs them done more than once a week.
Can kitchen staff clean the filters themselves between visits?
Yes, and it is worth doing. Pull the filters, soak them in hot water with a commercial alkaline degreaser, give the solution time to work, rinse the channels, drain them, and put them back the right way up so they drain into the cup. What staff should not do is climb into the canopy or open the plenum. That is confined, sharp, and part of the scheduled service.
When does a filter need replacing rather than cleaning?
Replace a filter when the frame has bowed so it no longer sits tight in the rail, when a baffle has come loose or collapsed, when the handle has torn out, or when corrosion has opened a hole. Any of those means air is getting past unfiltered even though the bank looks full. Hamilton Hood Cleaning photographs the specific filters at fault and quotes replacements rather than swapping them in unannounced.
Why is there a gap at the end of my filter bank?
A gap usually means the bank is short by one filter, or somebody fitted a size that does not match the rail. Air takes the easy route, so a large share of the grease-laden vapour goes through the gap without changing direction and lands in the plenum and duct instead. Filler pieces and correctly sized units close it, and the walk-through measures the rail before anything is ordered.
Does cleaning the filters mean the hood is compliant?
No. Clean filters are one part of a system that also includes the canopy, the plenum, the duct run, the riser, and the exhaust fan. The published NFPA 96 standard applies its grease limit to the whole path. Filters bought alone leave the rest undocumented, which is why filter cleaning is delivered inside a scheduled service and named on the same signed certificate.