Phoenix Journal · Extraction
The canopy over your cookline is the first thing that decides whether grease and steam are captured or left to drift. Choosing the right type - wall, island or condense - starts with what sits underneath it.
Kitchen Extraction Cleaning
A canopy only works when its shape, size and airflow suit the appliances beneath it. Get that pairing right and grease is captured at source, steam is drawn away cleanly, and the rest of the system stays easier to keep clean.
There are three families of canopy you will meet most often. Wall-mounted canopies sit over a cookline set against a wall. Island canopies hang over freestanding equipment in the middle of the room. Condense canopies deal with the wet, steamy loads that grease canopies are not built for - dishwashers, pass-through washers and steamers among them. Within those families sit variations built around make-up air and capture, which is where a lot of the practical decisions actually land.
The point of this page is to help you reason through the choice in order, so the canopy you specify matches the work the kitchen does rather than the shape that happened to fit the ceiling.
Work through these steps in order. Each one narrows the field, so by the end you are usually left with a single sensible type and a clear idea of the airflow and overhang it needs.
A wall-mounted canopy is the workhorse. Backed against a wall, it has one fewer open face to seal, so for a given cookline it is usually the most efficient way to capture grease. Configurations run from a plain extract hood up to units with an integral supply-air plenum and built-in lighting, and they carry baffle filters set at an angle so grease drains back rather than dripping forward. For the majority of cooklines that sit against a wall, this is the default and the easiest to service.
An island canopy earns its place when the cooking suite is a feature in the middle of the room or when the layout simply cannot put the heat against a wall. Because the plume can spill in any direction, the canopy has to be generous on all four sides and often moves more air than a wall unit doing comparable work. Island canopies are frequently paired with a service spine that hides the gas, electrical and water runs feeding the suite, and they may be single- or double-sided depending on how the equipment is arranged. The trade-off is size, airflow and, usually, cost.
Condense canopies solve a different problem entirely. Their job is water vapour, not fat, so they are built to let steam condense and drain rather than to trap grease. Placing one over a warewasher or a steam-heavy station keeps that wet load out of your grease extraction, which protects filters and ductwork from needless condensate and keeps the greasy plume and the steamy plume on separate paths. Mixing the two under one grease canopy is a common shortcut that tends to create dripping, corrosion and unhappy cleaning visits.
Compensating and capture-jet features can be layered onto wall or island canopies rather than being separate families. A compensating canopy introduces tempered supply air at the canopy face to balance what is extracted, while a capture-jet design tightens capture so you can extract less for the same result. Both are worth serious thought wherever the room struggles to feed the system, which is exactly the situation you meet in basement and windowless kitchens where natural replacement air is scarce and every design decision has to work harder.
Whichever type you land on, remember that the canopy is only the entry point. The filters, the duct behind it and the fan all inherit whatever the canopy captures, so a well-matched canopy is also the first step in keeping the whole extraction system clean, compliant and cheaper to maintain over its life.
The best canopy decisions are made before anything is fabricated, when the cookline layout, the appliance schedule and the make-up air strategy are all still on paper together. Sizing to the heaviest duty, keeping steam loads on their own condense canopy, and confirming the overhang and mounting height against a recognised standard removes most of the problems that otherwise surface once the kitchen is live. It also sets you up for straightforward maintenance, because a correctly matched canopy captures at source instead of letting grease travel where it is far harder to reach and clean.
If you are unsure which type your line needs, it is worth walking the kitchen with someone who cleans these systems for a living. The way a canopy fouls in service tells you a great deal about whether it was the right choice, and that experience is often the quickest route to a specification that holds up.
Questions
It is rarely a good idea. A grease canopy is built to strip fat from a hot plume, while a dishwasher produces a wet, steamy load that condenses and drips if it is drawn through grease filters. In most kitchens the steam station is better served by its own condense canopy, keeping the greasy and steamy loads on separate paths so filters and ductwork stay in better condition.
If the heavy cooking equipment is genuinely freestanding, then yes - an island canopy captures from all four sides in a way a wall unit cannot. The catch is that island canopies are larger and usually move more air for the same appliances, so where the layout allows it, moving the cookline against a wall and fitting a wall-mounted canopy is often the cheaper and more efficient choice.
Phoenix Duct Clean · by the numbers
The right canopy and filters only help if the system stays clean. Phoenix degreases canopies, filters and ductwork to TR19 Grease - UK-wide, overnight.