{"product_id":"radial-semi-rigid-ducting-90mm-x-50m-coil-anti-microbial-anti-static-mvhr-duct","title":"Radial Semi-Rigid Ducting 90mm x 50m Coil - Anti-Microbial \u0026 Anti-Static MVHR Duct","description":"\u003c!-- SEO Product Name: Casavent SRD-90-50 Radial Semi-Rigid Ducting 90mm x 50m Coil - Anti-Microbial \u0026 Anti-Static MVHR Duct --\u003e\n\u003cdiv style=\"font-size: 16px; max-width: 900px; margin: 0 auto; color: #2b2b2b; line-height: 1.6; font-family: Arial, Helvetica, sans-serif;\"\u003e\n\u003cp style=\"font-size: 16px; line-height: 1.7; color: #2b2b2b; margin: 0 0 16px 0;\"\u003eThe \u003cstrong\u003eCasavent SRD-90-50\u003c\/strong\u003e is a 90mm diameter radial semi-rigid air duct supplied as a \u003cstrong\u003e50 metre coil\u003c\/strong\u003e, designed for higher-airflow MVHR (Mechanical Ventilation with Heat Recovery) and MEV radial ductwork installations in residential properties. Built with the same \u003cstrong\u003edual-layer HDPE construction\u003c\/strong\u003e as the smaller-diameter version in the range, it combines a corrugated outer layer for mechanical strength and flexibility with a smooth inner bore enriched with an \u003cstrong\u003eantistatic and antimicrobial additive\u003c\/strong\u003e that reduces electrostatic tension and minimises dust accumulation.\u003c\/p\u003e\n\u003cp style=\"font-size: 16px; line-height: 1.7; color: #2b2b2b; margin: 0 0 16px 0;\"\u003eRadial ductwork runs individual duct lengths from a central manifold or distribution box directly to each supply or extract point. The 90mm size is typically specified where higher air volumes are required per duct run, reducing the number of parallel runs needed for larger rooms or higher-capacity systems.\u003c\/p\u003e\n\u003ctable role=\"presentation\" width=\"100%\" cellpadding=\"0\" cellspacing=\"0\" style=\"margin: 20px 0;\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding-right: 8px;\"\u003e\n\u003ctable role=\"presentation\" width=\"100%\" cellpadding=\"0\" cellspacing=\"0\" style=\"background: #008377CF; border-radius: 6px;\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: center; padding: 14px 6px;\"\u003e\n\u003cdiv style=\"font-size: 19px; font-weight: bold; color: #fff; line-height: 1.2;\"\u003e90mm\u003c\/div\u003e\n\u003cdiv style=\"font-size: 11px; font-weight: 400; color: #fff; margin-top: 4px; opacity: 0.95;\"\u003eOutside Diameter\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/td\u003e\n\u003ctd style=\"padding-right: 8px;\"\u003e\n\u003ctable role=\"presentation\" width=\"100%\" cellpadding=\"0\" cellspacing=\"0\" style=\"background: #008377CF; border-radius: 6px;\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: center; padding: 14px 6px;\"\u003e\n\u003cdiv style=\"font-size: 19px; font-weight: bold; color: #fff; line-height: 1.2;\"\u003e76mm\u003c\/div\u003e\n\u003cdiv style=\"font-size: 11px; font-weight: 400; color: #fff; margin-top: 4px; opacity: 0.95;\"\u003eInternal Diameter\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/td\u003e\n\u003ctd style=\"padding-right: 8px;\"\u003e\n\u003ctable role=\"presentation\" width=\"100%\" cellpadding=\"0\" cellspacing=\"0\" style=\"background: #008377CF; border-radius: 6px;\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: center; padding: 14px 6px;\"\u003e\n\u003cdiv style=\"font-size: 19px; font-weight: bold; color: #fff; line-height: 1.2;\"\u003e50m\u003c\/div\u003e\n\u003cdiv style=\"font-size: 11px; font-weight: 400; color: #fff; margin-top: 4px; opacity: 0.95;\"\u003eCoil Length\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/td\u003e\n\u003ctd style=\"padding-right: 8px;\"\u003e\n\u003ctable role=\"presentation\" width=\"100%\" cellpadding=\"0\" cellspacing=\"0\" style=\"background: #008377CF; border-radius: 6px;\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: center; padding: 14px 6px;\"\u003e\n\u003cdiv style=\"font-size: 19px; font-weight: bold; color: #fff; line-height: 1.2;\"\u003e330mm\u003c\/div\u003e\n\u003cdiv style=\"font-size: 11px; font-weight: 400; color: #fff; margin-top: 4px; opacity: 0.95;\"\u003eBending Radius\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/td\u003e\n\u003ctd style=\"padding-right: 8px;\"\u003e\n\u003ctable role=\"presentation\" width=\"100%\" cellpadding=\"0\" cellspacing=\"0\" style=\"background: #008377CF; border-radius: 6px;\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: center; padding: 14px 6px;\"\u003e\n\u003cdiv style=\"font-size: 19px; font-weight: bold; color: #fff; line-height: 1.2;\"\u003e366N\u003c\/div\u003e\n\u003cdiv style=\"font-size: 11px; font-weight: 400; color: #fff; margin-top: 4px; opacity: 0.95;\"\u003eCompression Strength\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003ctable role=\"presentation\" width=\"100%\" cellpadding=\"0\" cellspacing=\"0\" style=\"background: #008377CF; border-radius: 6px;\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: center; padding: 14px 6px;\"\u003e\n\u003cdiv style=\"font-size: 19px; font-weight: bold; color: #fff; line-height: 1.2;\"\u003e-25°C to +90°C\u003c\/div\u003e\n\u003cdiv style=\"font-size: 11px; font-weight: 400; color: #fff; margin-top: 4px; opacity: 0.95;\"\u003eService Temperature\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ctable role=\"presentation\" width=\"100%\" cellpadding=\"0\" cellspacing=\"0\" style=\"margin: 18px 0; background: #E6F4F3; border-left: 4px solid #008377CF; border-radius: 4px;\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 14px 18px;\"\u003e\n\u003cdiv style=\"font-weight: bold; color: #008377cf; font-size: 14px; margin-bottom: 4px; text-transform: uppercase; letter-spacing: 0.03em;\"\u003eSystem Component\u003c\/div\u003e\n\u003cdiv style=\"font-size: 15px; color: #2b2b2b; line-height: 1.6;\"\u003eThis is a \u003cstrong\u003eradial (semi-rigid) duct\u003c\/strong\u003e, not flexible insulated hose. It requires manifold\/distribution boxes, plenums, flanges, lock rings and sealing rings (sold separately) to complete a working system.\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ctable role=\"presentation\" width=\"100%\" cellpadding=\"0\" cellspacing=\"0\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd width=\"50%\" style=\"padding-right: 10px; vertical-align: top; padding-bottom: 12px;\"\u003e\n\u003ctable role=\"presentation\" width=\"100%\" cellpadding=\"0\" cellspacing=\"0\" style=\"background: #F7FAFA; border: 1px solid #D9EDEA; border-radius: 6px;\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 16px;\"\u003e\n\u003cdiv style=\"font-weight: bold; color: #00625d; font-size: 15px; margin-bottom: 6px;\"\u003eHigher Airflow Capacity\u003c\/div\u003e\n\u003cdiv style=\"font-size: 14px; color: #2b2b2b; line-height: 1.6;\"\u003eThe larger 90mm bore supports \u003cstrong\u003egreater air volumes per duct run\u003c\/strong\u003e than the 75mm size, useful for larger rooms, kitchens, or higher-capacity MVHR\/MEV systems where fewer, larger duct runs are preferred.\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/td\u003e\n\u003ctd width=\"50%\" style=\"vertical-align: top; padding-bottom: 12px;\"\u003e\n\u003ctable role=\"presentation\" width=\"100%\" cellpadding=\"0\" cellspacing=\"0\" style=\"background: #F7FAFA; border: 1px solid #D9EDEA; border-radius: 6px;\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 16px;\"\u003e\n\u003cdiv style=\"font-weight: bold; color: #00625d; font-size: 15px; margin-bottom: 6px;\"\u003eAntimicrobial \u0026amp; Antistatic Inner Bore\u003c\/div\u003e\n\u003cdiv style=\"font-size: 14px; color: #2b2b2b; line-height: 1.6;\"\u003eThe smooth inner layer is enriched with a \u003cstrong\u003ehighly effective antistatic and antimicrobial additive\u003c\/strong\u003e that significantly reduces surface electrostatic tension, minimising the attraction and build-up of dust particles along the duct walls.\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"50%\" style=\"padding-right: 10px; vertical-align: top; padding-bottom: 12px;\"\u003e\n\u003ctable role=\"presentation\" width=\"100%\" cellpadding=\"0\" cellspacing=\"0\" style=\"background: #F7FAFA; border: 1px solid #D9EDEA; border-radius: 6px;\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 16px;\"\u003e\n\u003cdiv style=\"font-weight: bold; color: #00625d; font-size: 15px; margin-bottom: 6px;\"\u003e330mm Bending Radius\u003c\/div\u003e\n\u003cdiv style=\"font-size: 14px; color: #2b2b2b; line-height: 1.6;\"\u003eA defined \u003cstrong\u003e330mm bending radius\u003c\/strong\u003e allows the duct to form gradual bends through joists and service voids without kinking or restricting the internal bore.\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/td\u003e\n\u003ctd width=\"50%\" style=\"vertical-align: top; padding-bottom: 12px;\"\u003e\n\u003ctable role=\"presentation\" width=\"100%\" cellpadding=\"0\" cellspacing=\"0\" style=\"background: #F7FAFA; border: 1px solid #D9EDEA; border-radius: 6px;\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 16px;\"\u003e\n\u003cdiv style=\"font-weight: bold; color: #00625d; font-size: 15px; margin-bottom: 6px;\"\u003eCorrugated Outer Layer\u003c\/div\u003e\n\u003cdiv style=\"font-size: 14px; color: #2b2b2b; line-height: 1.6;\"\u003eThe \u003cstrong\u003edual-layer HDPE construction\u003c\/strong\u003e gives the duct excellent mechanical strength and resistance to deformation, allowing it to withstand demanding operating conditions while remaining easy to handle and install.\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"50%\" style=\"padding-right: 10px; vertical-align: top; padding-bottom: 12px;\"\u003e\n\u003ctable role=\"presentation\" width=\"100%\" cellpadding=\"0\" cellspacing=\"0\" style=\"background: #F7FAFA; border: 1px solid #D9EDEA; border-radius: 6px;\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 16px;\"\u003e\n\u003cdiv style=\"font-weight: bold; color: #00625d; font-size: 15px; margin-bottom: 6px;\"\u003eWide Service Temperature Range\u003c\/div\u003e\n\u003cdiv style=\"font-size: 14px; color: #2b2b2b; line-height: 1.6;\"\u003eRated from \u003cstrong\u003e-25°C to +90°C\u003c\/strong\u003e, the duct is suited to the temperature range typically encountered in loft voids, external walls, and ducted MVHR\/MEV supply and extract runs.\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/td\u003e\n\u003ctd width=\"50%\" style=\"vertical-align: top; padding-bottom: 12px;\"\u003e\n\u003ctable role=\"presentation\" width=\"100%\" cellpadding=\"0\" cellspacing=\"0\" style=\"background: #F7FAFA; border: 1px solid #D9EDEA; border-radius: 6px;\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 16px;\"\u003e\n\u003cdiv style=\"font-weight: bold; color: #00625d; font-size: 15px; margin-bottom: 6px;\"\u003eWide Mounting Flexibility\u003c\/div\u003e\n\u003cdiv style=\"font-size: 14px; color: #2b2b2b; line-height: 1.6;\"\u003eAs a semi-rigid radial duct, it is designed for \u003cstrong\u003eceiling, floor, or wall mounting\u003c\/strong\u003e, giving installers more routing options than fully rigid ductwork through a building's fabric.\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ctable role=\"presentation\" width=\"100%\" cellpadding=\"0\" cellspacing=\"0\" style=\"margin: 18px 0; background: #E6F4F3; border-left: 4px solid #008377CF; border-radius: 4px;\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 14px 18px;\"\u003e\n\u003cdiv style=\"font-weight: bold; color: #008377cf; font-size: 14px; margin-bottom: 4px; text-transform: uppercase; letter-spacing: 0.03em;\"\u003eCompatible System Accessories\u003c\/div\u003e\n\u003cdiv style=\"font-size: 15px; color: #2b2b2b; line-height: 1.6;\"\u003eThis duct connects to \u003cstrong\u003e90mm manifold boxes, plenums, round flanges, lock rings and sealing rings\u003c\/strong\u003e to form a complete radial system. These components are sold separately — check compatible accessories before ordering.\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ctable role=\"presentation\" width=\"100%\" cellpadding=\"0\" cellspacing=\"0\" style=\"border-collapse: collapse; margin: 20px 0; border: 1px solid #E0E0E0; border-radius: 6px; overflow: hidden;\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd colspan=\"2\" style=\"background: #008377CF; color: #fff; font-weight: bold; padding: 9px 14px; font-size: 13px; letter-spacing: 0.05em; text-transform: uppercase;\"\u003eProduct Overview\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #F0F9F8; padding: 9px 14px; font-weight: 600; color: #333; font-size: 14px; width: 46%; border-bottom: 1px solid #E0E0E0;\"\u003eBrand\u003c\/td\u003e\n\u003ctd style=\"background: #F0F9F8; padding: 9px 14px; color: #222; font-size: 14px; border-bottom: 1px solid #E0E0E0;\"\u003eCasavent\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #FFFFFF; padding: 9px 14px; font-weight: 600; color: #333; font-size: 14px; width: 46%; border-bottom: 1px solid #E0E0E0;\"\u003eProduct Code\u003c\/td\u003e\n\u003ctd style=\"background: #FFFFFF; padding: 9px 14px; color: #222; font-size: 14px; border-bottom: 1px solid #E0E0E0;\"\u003eSRD-90-50\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #F0F9F8; padding: 9px 14px; font-weight: 600; color: #333; font-size: 14px; width: 46%; border-bottom: 1px solid #E0E0E0;\"\u003eDescription\u003c\/td\u003e\n\u003ctd style=\"background: #F0F9F8; padding: 9px 14px; color: #222; font-size: 14px; border-bottom: 1px solid #E0E0E0;\"\u003eRadial Semi-Rigid Ducting, Anti-Microbial \u0026amp; Anti-Static, 90mm x 50m Coil\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #FFFFFF; padding: 9px 14px; font-weight: 600; color: #333; font-size: 14px; width: 46%; border-bottom: 1px solid #E0E0E0;\"\u003eMaterial\u003c\/td\u003e\n\u003ctd style=\"background: #FFFFFF; padding: 9px 14px; color: #222; font-size: 14px; border-bottom: 1px solid #E0E0E0;\"\u003eHDPE (high-density polyethylene)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #F0F9F8; padding: 9px 14px; font-weight: 600; color: #333; font-size: 14px; width: 46%; border-bottom: 1px solid #E0E0E0;\"\u003eConstruction\u003c\/td\u003e\n\u003ctd style=\"background: #F0F9F8; padding: 9px 14px; color: #222; font-size: 14px; border-bottom: 1px solid #E0E0E0;\"\u003eDual-layer: corrugated outer \/ smooth antimicrobial \u0026amp; antistatic inner bore\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd colspan=\"2\" style=\"background: #008377CF; color: #fff; font-weight: bold; padding: 9px 14px; font-size: 13px; letter-spacing: 0.05em; text-transform: uppercase;\"\u003eDimensions\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #F0F9F8; padding: 9px 14px; font-weight: 600; color: #333; font-size: 14px; width: 46%; border-bottom: 1px solid #E0E0E0;\"\u003eOutside Diameter (D)\u003c\/td\u003e\n\u003ctd style=\"background: #F0F9F8; padding: 9px 14px; color: #222; font-size: 14px; border-bottom: 1px solid #E0E0E0;\"\u003e90mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #FFFFFF; padding: 9px 14px; font-weight: 600; color: #333; font-size: 14px; width: 46%; border-bottom: 1px solid #E0E0E0;\"\u003eInternal Diameter (D)\u003c\/td\u003e\n\u003ctd style=\"background: #FFFFFF; padding: 9px 14px; color: #222; font-size: 14px; border-bottom: 1px solid #E0E0E0;\"\u003e76mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #F0F9F8; padding: 9px 14px; font-weight: 600; color: #333; font-size: 14px; width: 46%; border-bottom: 1px solid #E0E0E0;\"\u003eCoil Length (L)\u003c\/td\u003e\n\u003ctd style=\"background: #F0F9F8; padding: 9px 14px; color: #222; font-size: 14px; border-bottom: 1px solid #E0E0E0;\"\u003e50m\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #FFFFFF; padding: 9px 14px; font-weight: 600; color: #333; font-size: 14px; width: 46%; border-bottom: 1px solid #E0E0E0;\"\u003eCoil Dimensions\u003c\/td\u003e\n\u003ctd style=\"background: #FFFFFF; padding: 9px 14px; color: #222; font-size: 14px; border-bottom: 1px solid #E0E0E0;\"\u003e1400 x 1400 x 50mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #F0F9F8; padding: 9px 14px; font-weight: 600; color: #333; font-size: 14px; width: 46%; border-bottom: 1px solid #E0E0E0;\"\u003eBending Radius\u003c\/td\u003e\n\u003ctd style=\"background: #F0F9F8; padding: 9px 14px; color: #222; font-size: 14px; border-bottom: 1px solid #E0E0E0;\"\u003e330mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd colspan=\"2\" style=\"background: #008377CF; color: #fff; font-weight: bold; padding: 9px 14px; font-size: 13px; letter-spacing: 0.05em; text-transform: uppercase;\"\u003ePerformance\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #F0F9F8; padding: 9px 14px; font-weight: 600; color: #333; font-size: 14px; width: 46%; border-bottom: 1px solid #E0E0E0;\"\u003eCompression Strength\u003c\/td\u003e\n\u003ctd style=\"background: #F0F9F8; padding: 9px 14px; color: #222; font-size: 14px; border-bottom: 1px solid #E0E0E0;\"\u003e366N\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #FFFFFF; padding: 9px 14px; font-weight: 600; color: #333; font-size: 14px; width: 46%; border-bottom: 1px solid #E0E0E0;\"\u003eService Temperature\u003c\/td\u003e\n\u003ctd style=\"background: #FFFFFF; padding: 9px 14px; color: #222; font-size: 14px; border-bottom: 1px solid #E0E0E0;\"\u003e-25°C to +90°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #F0F9F8; padding: 9px 14px; font-weight: 600; color: #333; font-size: 14px; width: 46%; border-bottom: 1px solid #E0E0E0;\"\u003ePressure Difference at ~50 m³\/h\u003c\/td\u003e\n\u003ctd style=\"background: #F0F9F8; padding: 9px 14px; color: #222; font-size: 14px; border-bottom: 1px solid #E0E0E0;\"\u003eApprox. 3 Pa (see manufacturer airflow\/pressure chart)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd colspan=\"2\" style=\"background: #008377CF; color: #fff; font-weight: bold; padding: 9px 14px; font-size: 13px; letter-spacing: 0.05em; text-transform: uppercase;\"\u003eApplication\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #F0F9F8; padding: 9px 14px; font-weight: 600; color: #333; font-size: 14px; width: 46%; border-bottom: 1px solid #E0E0E0;\"\u003eUse\u003c\/td\u003e\n\u003ctd style=\"background: #F0F9F8; padding: 9px 14px; color: #222; font-size: 14px; border-bottom: 1px solid #E0E0E0;\"\u003eSupply and exhaust ductwork for radial MVHR\/MEV systems in residential premises\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #FFFFFF; padding: 9px 14px; font-weight: 600; color: #333; font-size: 14px; width: 46%; border-bottom: 1px solid #E0E0E0;\"\u003eInstallation\u003c\/td\u003e\n\u003ctd style=\"background: #FFFFFF; padding: 9px 14px; color: #222; font-size: 14px; border-bottom: 1px solid #E0E0E0;\"\u003eCeiling, floor, or wall mounted; suspended ceilings and ceiling voids\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ctable role=\"presentation\" width=\"100%\" cellpadding=\"0\" cellspacing=\"0\" style=\"margin: 18px 0; background: #FFF6E5; border-left: 4px solid #E0942A; border-radius: 4px;\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 14px 18px;\"\u003e\n\u003cdiv style=\"font-weight: bold; color: #e0942a; font-size: 14px; margin-bottom: 4px; text-transform: uppercase; letter-spacing: 0.03em;\"\u003eAirflow \u0026amp; Pressure Performance\u003c\/div\u003e\n\u003cdiv style=\"font-size: 15px; color: #2b2b2b; line-height: 1.6;\"\u003ePressure difference across the duct rises with airflow rate, as shown on the manufacturer's performance chart. The 90mm duct's larger bore gives it a \u003cstrong\u003elower pressure drop than the 75mm duct at the same airflow rate\u003c\/strong\u003e, which is the main practical advantage of stepping up a size on longer or higher-volume runs. Refer to the full chart for intermediate values when sizing a system.\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cdiv style=\"border: 1px solid #D9EDEA; border-radius: 8px; margin-bottom: 10px; overflow: hidden;\"\u003e\n\u003cdetails\u003e\n\u003csummary style=\"padding: 14px 18px; font-size: 15px; font-weight: bold; color: #00625d; cursor: pointer; list-style: none; display: flex; align-items: center; justify-content: space-between; background: #E6F4F3;\"\u003e\u003cspan\u003eWhat is the internal diameter of the 90mm duct?\u003c\/span\u003e\u003csvg width=\"18\" height=\"18\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"#008377CF\" stroke-width=\"2.5\"\u003e\u003cpolyline points=\"6 9 12 15 18 9\"\u003e\u003c\/polyline\u003e\u003c\/svg\u003e\u003c\/summary\u003e\n\u003cdiv style=\"padding: 14px 18px 16px; font-size: 15px; color: #2b2b2b; line-height: 1.65; border-top: 1px solid #D9EDEA; background: #fff;\"\u003eThe outside diameter is 90mm, with an internal bore diameter of 76mm.\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border: 1px solid #D9EDEA; border-radius: 8px; margin-bottom: 10px; overflow: hidden;\"\u003e\n\u003cdetails\u003e\n\u003csummary style=\"padding: 14px 18px; font-size: 15px; font-weight: bold; color: #00625d; cursor: pointer; list-style: none; display: flex; align-items: center; justify-content: space-between; background: #E6F4F3;\"\u003e\u003cspan\u003eWhat is the bending radius for this duct?\u003c\/span\u003e\u003csvg width=\"18\" height=\"18\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"#008377CF\" stroke-width=\"2.5\"\u003e\u003cpolyline points=\"6 9 12 15 18 9\"\u003e\u003c\/polyline\u003e\u003c\/svg\u003e\u003c\/summary\u003e\n\u003cdiv style=\"padding: 14px 18px 16px; font-size: 15px; color: #2b2b2b; line-height: 1.65; border-top: 1px solid #D9EDEA; background: #fff;\"\u003eThe bending radius for the 90mm duct is \u003cstrong\u003e330mm\u003c\/strong\u003e. Bending tighter than this can restrict airflow and stress the duct wall.\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border: 1px solid #D9EDEA; border-radius: 8px; margin-bottom: 10px; overflow: hidden;\"\u003e\n\u003cdetails\u003e\n\u003csummary style=\"padding: 14px 18px; font-size: 15px; font-weight: bold; color: #00625d; cursor: pointer; list-style: none; display: flex; align-items: center; justify-content: space-between; background: #E6F4F3;\"\u003e\u003cspan\u003eHow does the 90mm duct compare to the 75mm duct?\u003c\/span\u003e\u003csvg width=\"18\" height=\"18\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"#008377CF\" stroke-width=\"2.5\"\u003e\u003cpolyline points=\"6 9 12 15 18 9\"\u003e\u003c\/polyline\u003e\u003c\/svg\u003e\u003c\/summary\u003e\n\u003cdiv style=\"padding: 14px 18px 16px; font-size: 15px; color: #2b2b2b; line-height: 1.65; border-top: 1px solid #D9EDEA; background: #fff;\"\u003eThe 90mm duct has a larger internal bore, giving it a lower pressure drop at the same airflow rate and making it better suited to longer runs or higher-volume supply\/extract points. It has a slightly wider bending radius (330mm vs 290mm) and marginally lower compression strength (366N vs 394N) than the 75mm duct.\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border: 1px solid #D9EDEA; border-radius: 8px; margin-bottom: 10px; overflow: hidden;\"\u003e\n\u003cdetails\u003e\n\u003csummary style=\"padding: 14px 18px; font-size: 15px; font-weight: bold; color: #00625d; cursor: pointer; list-style: none; display: flex; align-items: center; justify-content: space-between; background: #E6F4F3;\"\u003e\u003cspan\u003eWhat does the antimicrobial and antistatic lining do?\u003c\/span\u003e\u003csvg width=\"18\" height=\"18\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"#008377CF\" stroke-width=\"2.5\"\u003e\u003cpolyline points=\"6 9 12 15 18 9\"\u003e\u003c\/polyline\u003e\u003c\/svg\u003e\u003c\/summary\u003e\n\u003cdiv style=\"padding: 14px 18px 16px; font-size: 15px; color: #2b2b2b; line-height: 1.65; border-top: 1px solid #D9EDEA; background: #fff;\"\u003eThe inner bore is treated with an additive that reduces surface electrostatic tension, which in turn minimises the attraction and build-up of dust particles inside the duct over time.\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border: 1px solid #D9EDEA; border-radius: 8px; margin-bottom: 10px; overflow: hidden;\"\u003e\n\u003cdetails\u003e\n\u003csummary style=\"padding: 14px 18px; font-size: 15px; font-weight: bold; color: #00625d; cursor: pointer; list-style: none; display: flex; align-items: center; justify-content: space-between; background: #E6F4F3;\"\u003e\u003cspan\u003eCan this duct be used for both supply and extract air?\u003c\/span\u003e\u003csvg width=\"18\" height=\"18\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"#008377CF\" stroke-width=\"2.5\"\u003e\u003cpolyline points=\"6 9 12 15 18 9\"\u003e\u003c\/polyline\u003e\u003c\/svg\u003e\u003c\/summary\u003e\n\u003cdiv style=\"padding: 14px 18px 16px; font-size: 15px; color: #2b2b2b; line-height: 1.65; border-top: 1px solid #D9EDEA; background: #fff;\"\u003eYes. This radial semi-rigid duct is suitable for both supply and exhaust\/extract runs in residential MVHR and MEV systems.\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border: 1px solid #D9EDEA; border-radius: 8px; margin-bottom: 10px; overflow: hidden;\"\u003e\n\u003cdetails\u003e\n\u003csummary style=\"padding: 14px 18px; font-size: 15px; font-weight: bold; color: #00625d; cursor: pointer; list-style: none; display: flex; align-items: center; justify-content: space-between; background: #E6F4F3;\"\u003e\u003cspan\u003eWhat accessories do I need to complete a system with this duct?\u003c\/span\u003e\u003csvg width=\"18\" height=\"18\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"#008377CF\" stroke-width=\"2.5\"\u003e\u003cpolyline points=\"6 9 12 15 18 9\"\u003e\u003c\/polyline\u003e\u003c\/svg\u003e\u003c\/summary\u003e\n\u003cdiv style=\"padding: 14px 18px 16px; font-size: 15px; color: #2b2b2b; line-height: 1.65; border-top: 1px solid #D9EDEA; background: #fff;\"\u003eA complete radial run typically needs a manifold or distribution box, a plenum or round flange with lock ring, and a sealing ring for an airtight connection, all sized for 90mm. These are sold separately.\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border: 1px solid #D9EDEA; border-radius: 8px; margin-bottom: 10px; overflow: hidden;\"\u003e\n\u003cdetails\u003e\n\u003csummary style=\"padding: 14px 18px; font-size: 15px; font-weight: bold; color: #00625d; cursor: pointer; list-style: none; display: flex; align-items: center; justify-content: space-between; background: #E6F4F3;\"\u003e\u003cspan\u003eWhat temperature range is the duct rated for?\u003c\/span\u003e\u003csvg width=\"18\" height=\"18\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"#008377CF\" stroke-width=\"2.5\"\u003e\u003cpolyline points=\"6 9 12 15 18 9\"\u003e\u003c\/polyline\u003e\u003c\/svg\u003e\u003c\/summary\u003e\n\u003cdiv style=\"padding: 14px 18px 16px; font-size: 15px; color: #2b2b2b; line-height: 1.65; border-top: 1px solid #D9EDEA; background: #fff;\"\u003eThe duct has a service temperature range of \u003cstrong\u003e-25°C to +90°C\u003c\/strong\u003e, suitable for typical loft void, wall, and ducted MVHR\/MEV installation conditions.\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Casavent","offers":[{"title":"Default Title","offer_id":65611352244573,"sku":"SRD-90-50","price":270.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0958\/2051\/3629\/files\/75mmx50mSemiRigidRadialMVHRDuctingHoseAntiBacterial_Static.jpg?v=1787059040","url":"https:\/\/qualityheating.co.uk\/products\/radial-semi-rigid-ducting-90mm-x-50m-coil-anti-microbial-anti-static-mvhr-duct","provider":"AIZO Quality Heating","version":"1.0","type":"link"}