{"product_id":"verplas-150mm-round-duct-silencer-600mm-inline-attenuator","title":"Verplas 204x60mm 600mm Flat Duct Silencer Noise Attenuator","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\u003eVerplas VKC5660\u003c\/strong\u003e is a \u003cstrong\u003e204×60mm flat rectangular uPVC in-line duct silencer, 600mm long\u003c\/strong\u003e, designed to \u003cstrong\u003eattenuate fan noise and limit cross-talk between rooms\u003c\/strong\u003e in System 204 flat-channel ventilation installations. Part of the Verplas Noise Solutions range, it fits inline within a 204×60mm flat duct run and is \u003cstrong\u003elined with acoustic material\u003c\/strong\u003e to absorb broadband duct-borne noise from MVHR units, dMEV fans, and continuous extract systems. It is \u003cstrong\u003eSAP Appendix Q compliant\u003c\/strong\u003e and suitable for use on both supply and extract branches.\u003c\/p\u003e\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;\"\u003eVKC5660\u003c\/div\u003e\n\u003cdiv style=\"font-size: .82em; color: #444; margin-top: 2px;\"\u003eVerplas SKU\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;\"\u003e204×60mm\u003c\/div\u003e\n\u003cdiv style=\"font-size: .82em; color: #444; margin-top: 2px;\"\u003eDuct Profile\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;\"\u003e600mm\u003c\/div\u003e\n\u003cdiv style=\"font-size: .82em; color: #444; margin-top: 2px;\"\u003eSilencer Length\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;\"\u003e5,264 mm²\u003c\/div\u003e\n\u003cdiv style=\"font-size: .82em; color: #444; margin-top: 2px;\"\u003eMin Free Area\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;\"\u003eSAP App. Q\u003c\/div\u003e\n\u003cdiv style=\"font-size: .82em; color: #444; margin-top: 2px;\"\u003eCompliant\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\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\u003eRange Context:\u003c\/strong\u003e The VKC5660 is the \u003cstrong\u003eshortest silencer in the Verplas 204×60mm Noise Solutions range\u003c\/strong\u003e. Longer versions are available — VKC5661 (1m) and VKC5662 (1.5m) — for installations requiring greater attenuation. A \u003cstrong\u003eHi-Flow variant (VKC5663)\u003c\/strong\u003e is also available for high-airflow systems.\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\u003ePressure Drop:\u003c\/strong\u003e Every in-line silencer adds resistance to the duct system. \u003cstrong\u003eInclude the silencer's pressure drop in your system design calculation\u003c\/strong\u003e to confirm your fan or MVHR unit can still achieve the required flow rate. Refer to the VKC5660 datasheet for published pressure drop figures at your design flow.\u003c\/div\u003e\n\u003cdiv style=\"background: #008377CF; color: #fff; padding: 10px 16px; margin: 28px 0 16px; border-radius: 4px; font-size: 1.05em; font-weight: bold;\"\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: bold; color: #008377; text-decoration: underline; margin-bottom: 8px;\"\u003e204×60mm Flat Profile\u003c\/div\u003e\n\u003cdiv style=\"font-size: .92em; color: #333;\"\u003eDesigned specifically for \u003cstrong\u003eSystem 204 flat rectangular ducting\u003c\/strong\u003e — the slim 60mm height makes it suitable for installation within ceiling voids, stud walls, and other space-constrained routes where circular silencers cannot fit.\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: bold; color: #008377; text-decoration: underline; margin-bottom: 8px;\"\u003eAcoustic Inner Lining\u003c\/div\u003e\n\u003cdiv style=\"font-size: .92em; color: #333;\"\u003eThe uPVC shell is \u003cstrong\u003elined with acoustic absorbent material\u003c\/strong\u003e that captures and dissipates broadband duct-borne noise — including the low-to-mid frequency tones characteristic of MVHR and dMEV fan units.\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: bold; color: #008377; text-decoration: underline; margin-bottom: 8px;\"\u003eFemale Adaptor Connectors\u003c\/div\u003e\n\u003cdiv style=\"font-size: .92em; color: #333;\"\u003eBoth ends feature \u003cstrong\u003efemale adaptors for connection outside the System 204 duct\u003c\/strong\u003e — accepting the male spigots of standard 204×60mm duct lengths, bends, and fittings without additional hardware.\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: bold; color: #008377; text-decoration: underline; margin-bottom: 8px;\"\u003eCross-Talk Prevention\u003c\/div\u003e\n\u003cdiv style=\"font-size: .92em; color: #333;\"\u003eFitted on room branch ducts in MVHR systems, the silencer \u003cstrong\u003eprevents noise from one room transmitting through the duct network to another\u003c\/strong\u003e — a common issue in open-plan layouts and adjacent bedrooms.\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: bold; color: #008377; text-decoration: underline; margin-bottom: 8px;\"\u003eSAP Appendix Q Compliant\u003c\/div\u003e\n\u003cdiv style=\"font-size: .92em; color: #333;\"\u003eFully compliant with \u003cstrong\u003eSAP Appendix Q product characteristics database recommendations\u003c\/strong\u003e for ducting used with both extract and MVHR systems — supporting Part F compliance documentation.\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: bold; color: #008377; text-decoration: underline; margin-bottom: 8px;\"\u003eNoise Ingress Reduction\u003c\/div\u003e\n\u003cdiv style=\"font-size: .92em; color: #333;\"\u003eAlso effective at reducing \u003cstrong\u003eexternal noise ingress\u003c\/strong\u003e transmitted through the duct from outside the building — particularly relevant for installations near busy roads or noisy external environments.\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: bold; color: #008377; text-decoration: underline; margin-bottom: 8px;\"\u003eWhite uPVC Construction\u003c\/div\u003e\n\u003cdiv style=\"font-size: .92em; color: #333;\"\u003eManufactured from \u003cstrong\u003ewhite uPVC\u003c\/strong\u003e consistent with all other Verplas System 204 flat channel components — connectors, bends, T-pieces, and plenum boxes.\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: bold; color: #008377; text-decoration: underline; margin-bottom: 8px;\"\u003eRange Available in 3 Lengths\u003c\/div\u003e\n\u003cdiv style=\"font-size: .92em; color: #333;\"\u003eWhere 600mm attenuation is insufficient, step up to the \u003cstrong\u003eVKC5661 (1m) or VKC5662 (1.5m)\u003c\/strong\u003e for greater insertion loss within the same duct profile.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background: #008377CF; color: #fff; padding: 10px 16px; margin: 28px 0 16px; border-radius: 4px; font-size: 1.05em; font-weight: bold;\"\u003eTechnical Specifications\u003c\/div\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; font-size: .92em; margin: 16px 0;\"\u003e\n\u003ctbody\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;\"\u003eVerplas SKU\u003c\/td\u003e\n\u003ctd style=\"padding: 9px 12px; color: #555; border-bottom: 1px solid #ddd;\"\u003eVKC5660\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;\"\u003eYour Reference\u003c\/td\u003e\n\u003ctd style=\"padding: 9px 12px; color: #555; border-bottom: 1px solid #ddd;\"\u003eSIL150\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;\"\u003eDuct Profile\u003c\/td\u003e\n\u003ctd style=\"padding: 9px 12px; color: #555; border-bottom: 1px solid #ddd;\"\u003e204×60mm flat rectangular\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;\"\u003eSilencer Body Length\u003c\/td\u003e\n\u003ctd style=\"padding: 9px 12px; color: #555; border-bottom: 1px solid #ddd;\"\u003e600 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;\"\u003eMaterial\u003c\/td\u003e\n\u003ctd style=\"padding: 9px 12px; color: #555; border-bottom: 1px solid #ddd;\"\u003eWhite uPVC with acoustic inner lining\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;\"\u003eMinimum Free Area\u003c\/td\u003e\n\u003ctd style=\"padding: 9px 12px; color: #555; border-bottom: 1px solid #ddd;\"\u003e5,264 mm²\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;\"\u003eColour\u003c\/td\u003e\n\u003ctd style=\"padding: 9px 12px; color: #555; border-bottom: 1px solid #ddd;\"\u003eWhite\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;\"\u003eConnection Type\u003c\/td\u003e\n\u003ctd style=\"padding: 9px 12px; color: #555; border-bottom: 1px solid #ddd;\"\u003eFemale adaptor both ends — accepts System 204 male spigots\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;\"\u003eCompliance\u003c\/td\u003e\n\u003ctd style=\"padding: 9px 12px; color: #555; border-bottom: 1px solid #ddd;\"\u003eSAP Appendix Q — extract and MVHR systems\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;\"\u003eLonger Variants\u003c\/td\u003e\n\u003ctd style=\"padding: 9px 12px; color: #555; border-bottom: 1px solid #ddd;\"\u003eVKC5661 (1m), VKC5662 (1.5m)\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;\"\u003eHi-Flow Variant\u003c\/td\u003e\n\u003ctd style=\"padding: 9px 12px; color: #555; border-bottom: 1px solid #ddd;\"\u003eVKC5663 (600mm Hi-Flow)\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;\"\u003eTypical Use\u003c\/td\u003e\n\u003ctd style=\"padding: 9px 12px; color: #555; border-bottom: 1px solid #ddd;\"\u003eMVHR branch ducts, dMEV systems, single-fan extract runs, noise ingress control\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cdiv style=\"background: #008377CF; color: #fff; padding: 10px 16px; margin: 28px 0 16px; border-radius: 4px; font-size: 1.05em; font-weight: bold;\"\u003eFrequently Asked Questions\u003c\/div\u003e\n\u003cdetails style=\"margin-bottom: 8px; border: 1px solid #c8e6e3; border-radius: 4px; overflow: hidden;\"\u003e\n\u003csummary style=\"background: #008377CF; color: #fff; padding: 11px 14px; cursor: pointer; font-weight: 600; font-size: .95em; list-style: none;\"\u003eWhere should I fit this silencer in a 204×60mm duct run?\u003c\/summary\u003e\n\u003cdiv style=\"padding: 12px 14px; font-size: .92em; color: #333; background: #fff;\"\u003eFor fan noise attenuation, install the silencer \u003cstrong\u003eas close as possible to the fan or MVHR unit\u003c\/strong\u003e on the branch duct — this intercepts noise before it travels to the room terminal. For cross-talk prevention between rooms, position the silencer \u003cstrong\u003eon the branch duct between the room outlet and the main distribution duct\u003c\/strong\u003e.\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 8px; border: 1px solid #c8e6e3; border-radius: 4px; overflow: hidden;\"\u003e\n\u003csummary style=\"background: #008377CF; color: #fff; padding: 11px 14px; cursor: pointer; font-weight: 600; font-size: .95em; list-style: none;\"\u003eWill the VKC5660 fit in a standard ceiling void?\u003c\/summary\u003e\n\u003cdiv style=\"padding: 12px 14px; font-size: .92em; color: #333; background: #fff;\"\u003eYes. The 204×60mm flat profile is specifically designed for \u003cstrong\u003eceiling voids and floor zones where height is restricted\u003c\/strong\u003e. At just 60mm deep, it fits within standard timber joist depths when installed horizontally within the duct run.\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 8px; border: 1px solid #c8e6e3; border-radius: 4px; overflow: hidden;\"\u003e\n\u003csummary style=\"background: #008377CF; color: #fff; padding: 11px 14px; cursor: pointer; font-weight: 600; font-size: .95em; list-style: none;\"\u003eWhat is the difference between VKC5660 and VKC5663 (Hi-Flow)?\u003c\/summary\u003e\n\u003cdiv style=\"padding: 12px 14px; font-size: .92em; color: #333; background: #fff;\"\u003eBoth are 600mm long and 204×60mm profile. The \u003cstrong\u003eVKC5663 Hi-Flow variant\u003c\/strong\u003e is designed for higher airflow systems where a standard silencer would create excessive pressure drop — it maintains a larger free area at higher flow rates. Use VKC5663 where your system airflow exceeds the rated capacity of the VKC5660.\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 8px; border: 1px solid #c8e6e3; border-radius: 4px; overflow: hidden;\"\u003e\n\u003csummary style=\"background: #008377CF; color: #fff; padding: 11px 14px; cursor: pointer; font-weight: 600; font-size: .95em; list-style: none;\"\u003eDo I need a silencer on every room branch in an MVHR system?\u003c\/summary\u003e\n\u003cdiv style=\"padding: 12px 14px; font-size: .92em; color: #333; background: #fff;\"\u003eNot necessarily — silencers are most beneficial on branches serving \u003cstrong\u003ebedrooms, living rooms, or any noise-sensitive room\u003c\/strong\u003e adjacent to the MVHR unit or to another occupied room. Supply and extract branches on both sides of a party wall or between bedrooms are the highest-priority locations.\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 8px; border: 1px solid #c8e6e3; border-radius: 4px; overflow: hidden;\"\u003e\n\u003csummary style=\"background: #008377CF; color: #fff; padding: 11px 14px; cursor: pointer; font-weight: 600; font-size: .95em; list-style: none;\"\u003eIs this silencer suitable for a tumble dryer exhaust?\u003c\/summary\u003e\n\u003cdiv style=\"padding: 12px 14px; font-size: .92em; color: #333; background: #fff;\"\u003eNo. Tumble dryer exhausts carry \u003cstrong\u003ehot, moist, lint-laden air\u003c\/strong\u003e that can clog and damage acoustic lining materials. Use only manufacturer-approved tumble dryer ducting for this application.\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 8px; border: 1px solid #c8e6e3; border-radius: 4px; overflow: hidden;\"\u003e\n\u003csummary style=\"background: #008377CF; color: #fff; padding: 11px 14px; cursor: pointer; font-weight: 600; font-size: .95em; list-style: none;\"\u003eCan I use this on an MVHR supply branch?\u003c\/summary\u003e\n\u003cdiv style=\"padding: 12px 14px; font-size: .92em; color: #333; background: #fff;\"\u003eYes — the VKC5660 is suitable for installation on \u003cstrong\u003eboth supply and extract branches\u003c\/strong\u003e. On supply branches it reduces fan noise reaching the room; on extract branches it prevents cross-talk and reduces noise ingress from outside.\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e","brand":"Verplas","offers":[{"title":"Default Title","offer_id":64761255067997,"sku":"SIL150","price":67.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0958\/2051\/3629\/files\/204x60mmx1.5mLongDuctSilencer.jpg?v=1779383711","url":"https:\/\/qualityheating.co.uk\/products\/verplas-150mm-round-duct-silencer-600mm-inline-attenuator","provider":"AIZO Quality Heating","version":"1.0","type":"link"}