
Round Spiral Duct
Fabricated round spiral ductwork in galvanised steel for HVAC distribution systems.
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Duct & Accessories
Panel, bag and HEPA filters in all standard and bespoke sizes — the cheapest maintenance item in the building and the one most worth getting right.
Part of our Heating & Cooling Equipment service line — we supply, install and maintain it, not just sell it.
Filters protect the coil, the fan and the occupants, in roughly that order of cost. A blocked filter raises fan energy, starves the coil, and eventually lets the dirt through anyway when the media distorts under pressure.
Grade matters as much as replacement interval. Too coarse and the coil fouls; too fine without a pre-filter and the final filter loads in weeks instead of months. A cheap panel pre-filter in front of an expensive bag filter is almost always the right economics.
Representative units and components. Configuration, finish and connection sizes are built to the order — these show the range, not a fixed model.



Sizes, materials and duty are confirmed against your drawing and a site survey before quotation — nothing here is a fixed catalogue entry.
Technical
| Types | Panel, pleated, bag, rigid, HEPA |
|---|---|
| Grades | ISO Coarse through ISO ePM1, HEPA H13/H14 |
| Sizes | All standard sizes, plus bespoke |
| Frames | Cardboard, plastic or metal |
| Supply | Single or scheduled replacement programme |
Indicative figures. Final specification is confirmed against your duty and site survey at quotation.
Materials of construction
| Media | Synthetic, glass fibre or blended |
|---|---|
| Frame | Cardboard, plastic or galvanised steel |
| Sealant | Polyurethane |
Applications
Options & accessories

Fabricated round spiral ductwork in galvanised steel for HVAC distribution systems.
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Volume control dampers for precise airflow balancing in HVAC distribution networks.
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Seven service lines. One engineering team. Tell us your load, site and timeline — we will come back with a costed proposal.