Canopy, filters & fan
Baffle filters drain the grease they catch into gutters, channels and trays built into the canopy. These capture points do a quiet, essential job - but they are the easiest part of the system to forget, and a full gutter turns a self-draining canopy into one that pools and overflows grease back where it came from.
The short answer
Baffle filters drain the grease they catch into gutters, channels and trays built into the canopy. These capture points do a quiet, essential job - but they are the easiest part of the system to forget, and a full gutter turns a self-draining canopy into one that pools and overflows grease back where it came from.
The detail
A baffle filter only stays self-draining if the grease it sheds has somewhere to go. That is the job of the capture system: a U-channel around the bottom edge of the canopy skirt, collection troughs beneath the filters, and small cups or trays that catch the run-off. Together they gather drained grease and hold it until it is emptied, keeping it out of the airstream and off the kitchen.
These points fill steadily and invisibly. Every shift the filters drain into them, and unlike the filters themselves - which get taken down and washed - the gutters and trays are fixed in place and easy to walk past. A cup that is never emptied fills, a channel that is never wiped congeals, and the drainage the whole canopy relies on quietly stops working.
A full capture system fails in the worst way: it backs up. Grease that can no longer drain pools in the channel and eventually overflows, running back down the canopy face, dripping onto the cookline, or spilling where it becomes both a hygiene problem and a slip hazard. The clean-looking front of a canopy can be undermined entirely by a gutter nobody thought to empty.
Clearing them is simple but must be routine. The cups and trays are emptied, the channels and U-section wiped out, and the drain outlets checked clear, every time the filters are cleaned. Done as part of the same close-down task it takes moments; left as a separate job that no one owns, it is the part that slips until grease is running down the front of the hood.
What it means for you
The gutters and trays are a reminder that the cheapest components can undo the most expensive work. A perfectly cleaned filter draining into a blocked channel achieves nothing, because the grease it removes from the air has nowhere to go and comes straight back. The capture system and the filters are one job, not two.
They also belong in the professional clean, not just the daily one. A full extraction clean should address the canopy's drainage - the channels, troughs and outlets - alongside the plenum and duct, because congealed grease in a gutter is as much a hygiene and fire concern as grease anywhere else in the canopy. A clean that ignores the drainage has left the canopy half done.
Kept clear, the capture system does exactly what it should: it quietly collects and holds the grease the filters drain, keeping it off the cookline and out of the air until it is emptied. It is a small, unglamorous part of the system, but leaving it full is one of the quickest ways to spoil an otherwise well-maintained canopy.
The service behind the guide
Sibling guides
UV canopy system cleaning · Water-wash canopies still need cleaning · Cafe extraction cleaning
Questions
The drainage built into the canopy - a U-channel around the skirt, troughs beneath the filters and small cups or trays - that collect the grease baffle filters shed and hold it until it is emptied.
Because unlike filters, which are taken down and washed, the gutters and trays are fixed in place and easy to walk past. They fill steadily and invisibly until they back up.
Grease can no longer drain, so it pools and overflows - running down the canopy face, dripping onto the cookline and creating a hygiene and slip hazard, undoing the clean look of the front.
Every time the filters are cleaned. Empty the cups and trays, wipe out the channels and U-section, and check the drain outlets clear as part of the same close-down task.
Yes. A full extraction clean should address the canopy's channels, troughs and outlets alongside the plenum and duct, because congealed grease in a gutter is as much a concern as grease elsewhere.
Phoenix Duct Clean · by the numbers
We clean the whole path - canopy, filters, plenum, ductwork and fan - and verify the result to TR19 Grease. Call or email for a clear quote and a certificate you can show your insurer.