When you're specifying a commercial kitchen canopy in Melbourne, the filter choice is the single most influential decision on day-to-day cleaning workload and long-term grease management. Get it right and your canopy stays compliant with the AS 1851-2012 cleaning schedule with minimal staff effort. Get it wrong and you'll either fight grease build-up every week or pay for replacement filters every couple of years.
This guide compares the two filter types you'll actually be choosing between — baffle vs honeycomb filter — covers how each works, the grease capture mechanics, cleaning frequency, lifespan, and which one suits which cooking style. We also explain why galvanised steel baffle filters keep getting quoted by cheap suppliers despite being the wrong choice for commercial use.
A baffle filter is a series of overlapping vertical S-shaped or Z-shaped metal vanes set inside a stainless steel frame. As grease-laden air enters the canopy, the vanes force the air to change direction sharply — usually three or four times — within the filter body.
Grease droplets have more mass than air molecules. When the airflow changes direction, the air follows the path but the grease droplets can't — inertia carries them straight into the next vane. The grease hits the metal, condenses, and runs down to the bottom of the filter and into the canopy's grease trough below.
Key characteristics of stainless baffle filters:
An aluminium honeycomb filter is a dense matrix of small hexagonal aluminium cells, typically 3–10 mm across, packed into a stainless steel frame at a depth of around 50 mm. Air passing through the filter has to navigate through thousands of small passages.
Grease capture works two ways: first, the small cell openings force air into many parallel paths that change direction multiple times (the same inertial impaction as baffle filters but at higher density). Second, the large internal surface area of the honeycomb gives grease droplets many more opportunities to contact metal and condense.
Key characteristics of aluminium honeycomb filters:
| Property | Stainless baffle | Aluminium honeycomb |
|---|---|---|
| Construction | Vertical S/Z vanes in stainless frame | Hexagonal aluminium cells in stainless frame |
| Grease capture rate | Good | Higher |
| Self-draining | Yes — into canopy trough | Partially — most grease stays in filter |
| Cleaning frequency | Weekly to fortnightly typical | Weekly minimum, often more |
| Dishwasher safe | Yes | Yes, with care — chemicals degrade aluminium over time |
| Pressure drop on fan | Lower | Higher |
| Service life | 10–15+ years | 5–10 years |
| Damage resistance | Excellent — survives impact | Moderate — honeycomb cells can deform |
| Upfront cost | Lower | Higher |
| Total cost over 10 years | Lower (no replacement) | Higher (one replacement cycle typical) |
The filter choice depends mostly on cooking type, service volume, and willingness to commit to a cleaning schedule. Here's the decision framework we use at NXT GEN when specifying filters:
In larger commercial kitchens with mixed cooking processes, the practical answer is sometimes to mix filter types within the same canopy or across multiple canopies. A canopy above a char grill gets honeycomb filters; the canopy above the cold-station prep gets baffles. This optimises capture where it matters and cleaning workload where it doesn't.
The double filter bank approach takes this further by stacking two filter banks vertically — the first bank handles the bulk of grease capture, the second bank polishes whatever passes the first. We covered this in our double filter bank canopy guide.
If you're collecting quotes and one supplier comes in significantly cheaper than the rest, check whether their canopy is fitted with galvanised steel baffle filters instead of stainless. The two look almost identical when new. Six months later the difference is brutal.
Galvanised steel is mild steel coated in zinc. In a commercial kitchen environment — heat, moisture, grease, cleaning chemicals — the zinc coating breaks down within months. Once the zinc is gone, the underlying steel rusts. Rust contaminates the grease trough, gets pulled into the airstream, and forms rough surfaces inside the filter that grease sticks to far more aggressively than smooth stainless.
Galvanised filters fail a Food Act 1984 inspection in Victoria because corroded metal in a food preparation area is a contamination risk. They also fail AS 1851-2012 cleaning verification because rusted baffles can't be properly cleaned to specification. Replacing them within 12–18 months almost always costs more than specifying stainless from day one.
Always confirm filter material on any quote. The line item should specifically say "stainless steel baffle filters" or "aluminium honeycomb filters in stainless steel frame". If it just says "baffle filters" with no material specification, ask the question.
Both filter types can be cleaned in a commercial dishwasher with degreasing detergent — but the cleaning intervals and technique differ.
Remove filters from the canopy weekly to fortnightly depending on cooking volume. Pre-soak in hot water with commercial degreaser for 20–30 minutes. Run through a commercial dishwasher on its hottest cycle. The S-shaped vanes drain readily during the wash. Inspect for damage — bent vanes or compressed frames reduce capture efficiency.
Remove weekly minimum (more often for heavy-grease cooking). Soak in hot water with degreaser for 30–45 minutes — longer than baffles because the dense matrix holds grease more tightly. Avoid harsh alkaline detergents that aggressively attack aluminium; use a degreaser formulated for kitchen filter use. Run dishwasher cycle, then inspect — honeycomb cells deformed during handling significantly reduce capture rate.
For both filter types, AS 1851-2012 requires cleaning before grease deposit reaches 2 mm thickness. Document each cleaning date — operators get asked for this by insurance during claims and by Food Act inspectors during audits.
Not sure which filter type your kitchen needs?
Switching from baffle to honeycomb (or vice versa) on an existing canopy is usually straightforward — both filter types use the same standard slot dimensions and frame mounting. The exception is older canopies with non-standard slots, where bespoke replacements are needed.
Two considerations before upgrading filters on an existing canopy:
We also covered why upgrading the canopy's other components matters when you upgrade filters in our essential canopy upgrades guide.
Neither is universally better — they suit different cooking types. Stainless baffle filters are simpler, tougher, cheaper, and easier to maintain, making them ideal for moderate cooking (AS 1668.2 Process Types 2 and 3). Aluminium honeycomb filters capture more grease per square metre and suit heavy-grease cooking (Types 4, 5, and 6) where maximum capture is required to protect ductwork and meet fire compliance. For most Melbourne cafés and small restaurants, baffle filters in stainless steel are the right choice.
AS 1851-2012 requires cleaning before grease deposit reaches 2 mm. In practice, baffle filters in a moderate-volume café need cleaning weekly to fortnightly. Honeycomb filters and any filter in heavy-grease cooking need cleaning at least weekly, sometimes more often during peak service periods. Documenting each cleaning date in a maintenance log is a legal requirement under AS 1851 and often requested by insurers.
Yes for both stainless baffle and aluminium honeycomb filters — they're designed for commercial dishwasher cleaning with degreasing detergent. Pre-soak in hot water with degreaser for 20–45 minutes before the dishwasher cycle, depending on grease loading. Avoid harsh alkaline detergents on aluminium honeycomb filters as repeated exposure shortens their service life.
No — galvanised steel baffle filters fail multiple compliance requirements in commercial kitchens. The zinc coating breaks down in heat, moisture, and cleaning chemicals, leading to rust within 6–12 months. Rusted filters fail Food Act 1984 contamination requirements in Victoria, fail AS 1851-2012 cleaning verification, and contaminate the grease trough. Always specify stainless steel baffle filters or aluminium honeycomb filters in a stainless frame — galvanised options should be rejected on any commercial quote.
Stainless steel baffle filters typically last 10–15 years with regular cleaning, sometimes 20+ years in moderate-use kitchens. Aluminium honeycomb filters typically last 5–10 years — shorter because repeated exposure to alkaline cleaning chemicals gradually attacks the aluminium honeycomb structure. Both should be replaced when vanes/cells are visibly deformed, when frames are warped, or when corrosion is visible.
Usually yes — both filter types use standard slot dimensions and stainless mounting frames on most modern canopies. The upgrade is straightforward physically, but you should verify two things first: that your exhaust fan can handle the higher pressure drop of honeycomb filters (otherwise exhaust capacity drops below AS 1668.2 minimum), and that your grease trough drainage suits the changed grease flow pattern. Older canopies with non-standard slot dimensions may need bespoke filter sizing.
Yes, somewhat. Honeycomb filters capture more grease per square metre, meaning less grease passes through into ductwork — which is where serious kitchen fires usually start (grease accumulating in flues then igniting). For high-grease cooking like deep fryers, char grills, and woks, the higher capture rate of honeycomb filters provides additional fire protection beyond what baffles deliver. For moderate cooking, both filter types provide adequate fire protection when properly maintained.
