{"product_id":"160mm-to-150mm-reducer-galvanised-spiral-duct","title":"160mm to 150mm Reducer Galvanised Spiral Duct","description":"\u003cdiv style=\"font-size:16px;font-family:Arial,sans-serif;color:#222;max-width:900px;margin:0 auto;line-height:1.6;\"\u003e\n\u003cp\u003eThe \u003cstrong\u003eVEL12\/0016\u003c\/strong\u003e is a \u003cstrong\u003e160mm to 150mm concentric reducer for galvanised spiral ducting\u003c\/strong\u003e, providing a \u003cstrong\u003eone-piece transition between 160mm and 150mm duct diameters\u003c\/strong\u003e within a metal spiral system. Manufactured from \u003cstrong\u003elightweight galvanised steel to DW144 specification\u003c\/strong\u003e, the reducer is a \u003cstrong\u003emale fitting\u003c\/strong\u003e that fits directly into the female end of 160mm spiral duct, with the 150mm end sized for connection to 150mm ductwork, fan spigots, or terminal fittings.\u003c\/p\u003e\n\n\u003cdiv style=\"display:flex;flex-wrap:wrap;justify-content:space-around;background:#e6f4f3;border-radius:6px;padding:8px 4px;margin:18px 0;\"\u003e\n\u003cdiv style=\"text-align:center;padding:12px 8px;\"\u003e\n\u003cdiv style=\"font-size:1.5em;font-weight:800;color:#008377;\"\u003e160mm\u003c\/div\u003e\n\u003cdiv style=\"font-size:.82em;color:#444;margin-top:2px;\"\u003eInlet Diameter\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"text-align:center;padding:12px 8px;\"\u003e\n\u003cdiv style=\"font-size:1.5em;font-weight:800;color:#008377;\"\u003e150mm\u003c\/div\u003e\n\u003cdiv style=\"font-size:.82em;color:#444;margin-top:2px;\"\u003eOutlet Diameter\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"text-align:center;padding:12px 8px;\"\u003e\n\u003cdiv style=\"font-size:1.5em;font-weight:800;color:#008377;\"\u003eConcentric\u003c\/div\u003e\n\u003cdiv style=\"font-size:.82em;color:#444;margin-top:2px;\"\u003eReducer Type\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"text-align:center;padding:12px 8px;\"\u003e\n\u003cdiv style=\"font-size:1.5em;font-weight:800;color:#008377;\"\u003eMale\u003c\/div\u003e\n\u003cdiv style=\"font-size:.82em;color:#444;margin-top:2px;\"\u003eFitting Type\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"text-align:center;padding:12px 8px;\"\u003e\n\u003cdiv style=\"font-size:1.5em;font-weight:800;color:#008377;\"\u003eGalvanised Steel\u003c\/div\u003e\n\u003cdiv style=\"font-size:.82em;color:#444;margin-top:2px;\"\u003eMaterial\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv style=\"background:#e6f4f3;border-left:4px solid #005c54;padding:12px 16px;margin:14px 0;border-radius:0 4px 4px 0;font-size:.95em;\"\u003e\n\u003cstrong\u003eConcentric Reducer:\u003c\/strong\u003e A concentric reducer steps the duct diameter down (or up) \u003cstrong\u003eon the same centreline\u003c\/strong\u003e, giving a smooth, symmetric transition that helps maintain even airflow distribution across the duct cross-section.\u003c\/div\u003e\n\u003cdiv style=\"background:#fff8e1;border-left:4px solid #c77a00;padding:12px 16px;margin:14px 0;border-radius:0 4px 4px 0;font-size:.95em;\"\u003e\n\u003cstrong\u003eJoining Two Male Fittings:\u003c\/strong\u003e Like other spiral fittings, the VEL12\/0016 is \u003cstrong\u003emale\u003c\/strong\u003e. If it needs to connect to another male fitting (e.g. directly to a 150mm bend), a \u003cstrong\u003efemale connector\u003c\/strong\u003e will be required at that joint — it will not fit directly into another male spigot.\u003c\/div\u003e\n\n\u003cdiv style=\"background:#008377CF;color:#fff;padding:10px 16px;margin:28px 0 16px;border-radius:4px;font-size:1.05em;font-weight:700;\"\u003eKey Features\u003c\/div\u003e\n\u003cdiv style=\"display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:14px;margin:16px 0;\"\u003e\n\u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:6px;padding:16px 18px;\"\u003e\n\u003cdiv style=\"font-weight:700;color:#008377;text-decoration:underline;margin-bottom:8px;\"\u003e160mm to 150mm Transition\u003c\/div\u003e\n\u003cdiv style=\"font-size:.92em;color:#333;\"\u003eProvides the \u003cstrong\u003estandard one-piece reduction\u003c\/strong\u003e between 160mm and 150mm spiral duct diameters — used wherever a 160mm main run needs to step down to a 150mm branch, fan spigot, or terminal.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:6px;padding:16px 18px;\"\u003e\n\u003cdiv style=\"font-weight:700;color:#008377;text-decoration:underline;margin-bottom:8px;\"\u003eConcentric Profile\u003c\/div\u003e\n\u003cdiv style=\"font-size:.92em;color:#333;\"\u003eThe \u003cstrong\u003econcentric (on-centre) taper\u003c\/strong\u003e provides a smooth, symmetric transition that helps maintain even velocity distribution through the reduction, compared to an offset (eccentric) reducer.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:6px;padding:16px 18px;\"\u003e\n\u003cdiv style=\"font-weight:700;color:#008377;text-decoration:underline;margin-bottom:8px;\"\u003eGalvanised Steel to DW144\u003c\/div\u003e\n\u003cdiv style=\"font-size:.92em;color:#333;\"\u003eManufactured from \u003cstrong\u003elightweight galvanised steel to HVCA\/BESA DW144 specification\u003c\/strong\u003e, consistent with the rest of the 160mm spiral range.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:6px;padding:16px 18px;\"\u003e\n\u003cdiv style=\"font-weight:700;color:#008377;text-decoration:underline;margin-bottom:8px;\"\u003eMale Fitting — Fits Inside 160mm Duct\u003c\/div\u003e\n\u003cdiv style=\"font-size:.92em;color:#333;\"\u003eThe 160mm end is \u003cstrong\u003emale\u003c\/strong\u003e and slips directly into the \u003cstrong\u003efemale end of a SPIR160 duct length\u003c\/strong\u003e, with the 150mm end sized to suit the connecting 150mm component.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:6px;padding:16px 18px;\"\u003e\n\u003cdiv style=\"font-weight:700;color:#008377;text-decoration:underline;margin-bottom:8px;\"\u003eFan \u0026amp; Terminal Adapting\u003c\/div\u003e\n\u003cdiv style=\"font-size:.92em;color:#333;\"\u003eCommonly used to adapt a \u003cstrong\u003e160mm spiral main run to a fan, valve, or grille with a 150mm connection\u003c\/strong\u003e, avoiding the need for improvised or taped reductions.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:6px;padding:16px 18px;\"\u003e\n\u003cdiv style=\"font-weight:700;color:#008377;text-decoration:underline;margin-bottom:8px;\"\u003eCompact Single-Piece Body\u003c\/div\u003e\n\u003cdiv style=\"font-size:.92em;color:#333;\"\u003eThe reducer is a \u003cstrong\u003esingle pressed component\u003c\/strong\u003e, keeping the transition compact and straightforward to fit within ceiling voids and service routes.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv style=\"background:#008377CF;color:#fff;padding:10px 16px;margin:28px 0 16px;border-radius:4px;font-size:1.05em;font-weight:700;\"\u003eSpecifications\u003c\/div\u003e\n\u003ctable style=\"width:100%;border-collapse:collapse;font-size:.92em;margin:16px 0;\"\u003e\n\u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 12px;font-weight:600;color:#333;width:45%;border-bottom:1px solid #ddd;\"\u003eReference\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;color:#555;border-bottom:1px solid #ddd;\"\u003eVEL12\/0016\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:9px 12px;font-weight:600;color:#333;width:45%;border-bottom:1px solid #ddd;\"\u003eInlet Diameter\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;color:#555;border-bottom:1px solid #ddd;\"\u003e160 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 12px;font-weight:600;color:#333;width:45%;border-bottom:1px solid #ddd;\"\u003eOutlet Diameter\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;color:#555;border-bottom:1px solid #ddd;\"\u003e150 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:9px 12px;font-weight:600;color:#333;width:45%;border-bottom:1px solid #ddd;\"\u003eType\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;color:#555;border-bottom:1px solid #ddd;\"\u003eConcentric reducer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 12px;font-weight:600;color:#333;width:45%;border-bottom:1px solid #ddd;\"\u003eEnd Configuration\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;color:#555;border-bottom:1px solid #ddd;\"\u003eMale — fits inside 160mm female duct end\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:9px 12px;font-weight:600;color:#333;width:45%;border-bottom:1px solid #ddd;\"\u003eMaterial\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;color:#555;border-bottom:1px solid #ddd;\"\u003eGalvanised mild steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 12px;font-weight:600;color:#333;width:45%;border-bottom:1px solid #ddd;\"\u003eManufacturing Standard\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;color:#555;border-bottom:1px solid #ddd;\"\u003eHVCA \/ BESA DW144\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:9px 12px;font-weight:600;color:#333;width:45%;border-bottom:1px solid #ddd;\"\u003eUse With\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;color:#555;border-bottom:1px solid #ddd;\"\u003eSPIR160 (160mm side) and 150mm ductwork\/fittings (150mm side)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003cdiv style=\"background:#008377CF;color:#fff;padding:10px 16px;margin:28px 0 16px;border-radius:4px;font-size:1.05em;font-weight:700;\"\u003eFrequently Asked Questions\u003c\/div\u003e\n\u003cdetails style=\"margin-bottom:8px;border:1px solid #c8e6e3;border-radius:4px;overflow:hidden;\"\u003e\u003csummary style=\"background:#008377CF;color:#fff;padding:11px 14px;cursor:pointer;font-weight:600;font-size:.95em;list-style:none;\"\u003eCan this reducer be used in reverse, to step up from 150mm to 160mm?\u003c\/summary\u003e\u003cdiv style=\"padding:12px 14px;font-size:.92em;color:#333;background:#fff;\"\u003eA concentric reducer can physically be installed in either direction, but it is \u003cstrong\u003edesigned primarily as a step-down (160mm to 150mm) fitting\u003c\/strong\u003e. If stepping up, check that the 150mm end correctly engages with your 150mm ductwork before fixing.\u003c\/div\u003e\u003c\/details\u003e\u003cdetails style=\"margin-bottom:8px;border:1px solid #c8e6e3;border-radius:4px;overflow:hidden;\"\u003e\u003csummary style=\"background:#008377CF;color:#fff;padding:11px 14px;cursor:pointer;font-weight:600;font-size:.95em;list-style:none;\"\u003eWill reducing from 160mm to 150mm affect airflow?\u003c\/summary\u003e\u003cdiv style=\"padding:12px 14px;font-size:.92em;color:#333;background:#fff;\"\u003eReducing duct diameter \u003cstrong\u003eincreases air velocity and adds resistance\u003c\/strong\u003e at that point in the system. Ensure your fan or MVHR unit can deliver the required flow rate against the additional pressure drop introduced by the reduction.\u003c\/div\u003e\u003c\/details\u003e\u003cdetails style=\"margin-bottom:8px;border:1px solid #c8e6e3;border-radius:4px;overflow:hidden;\"\u003e\u003csummary style=\"background:#008377CF;color:#fff;padding:11px 14px;cursor:pointer;font-weight:600;font-size:.95em;list-style:none;\"\u003eHow does the 160mm end connect to the spiral duct?\u003c\/summary\u003e\u003cdiv style=\"padding:12px 14px;font-size:.92em;color:#333;background:#fff;\"\u003eThe 160mm end of the VEL12\/0016 is \u003cstrong\u003emale\u003c\/strong\u003e and inserts directly into the \u003cstrong\u003efemale end of a SPIR160 duct length\u003c\/strong\u003e, secured with self-drilling screws or rivets and sealed as required.\u003c\/div\u003e\u003c\/details\u003e\u003cdetails style=\"margin-bottom:8px;border:1px solid #c8e6e3;border-radius:4px;overflow:hidden;\"\u003e\u003csummary style=\"background:#008377CF;color:#fff;padding:11px 14px;cursor:pointer;font-weight:600;font-size:.95em;list-style:none;\"\u003eWhat if I need to connect the 150mm end to another fitting rather than a duct length?\u003c\/summary\u003e\u003cdiv style=\"padding:12px 14px;font-size:.92em;color:#333;background:#fff;\"\u003eIf the 150mm end needs to connect to \u003cstrong\u003eanother male fitting\u003c\/strong\u003e (e.g. a 150mm bend), you will need a \u003cstrong\u003efemale coupler\u003c\/strong\u003e at that joint, since two male ends cannot be joined directly.\u003c\/div\u003e\u003c\/details\u003e\n\u003c\/div\u003e","brand":"AIZO - Quality Heating","offers":[{"title":"Default Title","offer_id":64982218637661,"sku":"VEL12-0016","price":59.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0958\/2051\/3629\/files\/160mmto150mmReducerGalvanisedSpiralDuctVEL12-0016.jpg?v=1781534644","url":"https:\/\/qualityheating.co.uk\/products\/160mm-to-150mm-reducer-galvanised-spiral-duct","provider":"AIZO Quality Heating","version":"1.0","type":"link"}