Daikin FCU Plenums — Built for FWB & FXSQ Ducted Units

Daikin's FWB chilled-water fan coils and FXSQ VRV ducted units are everywhere in UK offices and hotels — and every one needs plenum boxes to connect the unit to the ductwork and grilles around it. Our 3D plenum builder has starting presets for the FWB 02–10 and FXSQ 20A–125A ranges: pick your model, check the sizes against your unit drawing, place spigots exactly where your layout needs them, and send the design to us for a quote.

Designed in 3D, checked against your unit

Preset dimensions are typical starting points for each Daikin model — always verify against the certified unit drawing and adjust the connection size, box dimensions and spigots in the builder to match. The design you submit is exactly what we fabricate: every spigot position is recorded in millimetres from the face edges.

One box or a whole VRV floor

A single replacement discharge plenum for an FWB in a refurbishment, or supply-and-return sets for forty FXSQs across a fit-out — mixed schedules of models and handings are no harder than uniform ones. For transitions, distribution duct and grille runs, see our FCU ductwork page, or send us your FCU schedule.

Frequently asked questions

Which Daikin fan coil units do you make plenums for?

Any of them. The 3D builder includes starting presets for the FWB chilled-water range (FWB 02–10) and the FXSQ VRV ducted range (FXSQ 20A–125A), and every dimension can be adjusted — so older ranges, larger units and special cases are all covered. Always verify sizes against the certified unit drawing.

Do you make both supply and return plenums for Daikin units?

Yes — discharge (supply) plenums with circular spigots for flexible or rigid duct, and return air plenums with optional filter sections. In the builder you can design one side and copy it to the other in a single click.

How accurate are the Daikin presets in the plenum builder?

They're typical starting points for each model, not certified dimensions. Daikin publishes exact connection sizes in the unit's installation drawings — check the preset against your drawing and adjust the connection width, height and spigot layout to match before requesting your quote.

How do I get a price for Daikin FCU plenums?

Design the box in the 3D builder and add it to a quote request — your design, including a picture and every spigot position, comes straight to our estimating team. For full schedules, send the Daikin model list and quantities through the contact page.