{"product_id":"vectaire-maxi-mvhr-whole-house-ventilation-with-heat-recovery-unit","title":"Vectaire Maxi MVHR Whole House Ventilation with Heat Recovery Unit","description":"\u003cdiv style=\"font-size:16px; font-family:Georgia, 'Times New Roman', serif; color:#1a1a1a; max-width:900px; margin:0 auto; line-height:1.7;\"\u003e\n\n  \u003c!-- Intro --\u003e\n  \u003cp style=\"font-size:1.08em; margin-bottom:1.4em;\"\u003e\n    The \u003cstrong\u003eVectaire Maxi\u003c\/strong\u003e is a \u003cstrong\u003ewhole-house MVHR (Mechanical Ventilation with Heat Recovery)\u003c\/strong\u003e system designed for residential properties up to \u003cstrong\u003e250 m²\u003c\/strong\u003e. UK-manufactured to ISO 9001:2015 and 14001:2015, it achieves up to \u003cstrong\u003e92% heat exchange efficiency\u003c\/strong\u003e with a peak airflow of \u003cstrong\u003e177 l\/s\u003c\/strong\u003e and a minimum specific fan power of just \u003cstrong\u003e0.40 W\/l\/s\u003c\/strong\u003e — among the most efficient values available for a unit of this capacity. The Maxi continuously extracts stale, humid air from wet rooms and replaces it with fresh, filtered, pre-warmed air, eliminating condensation and pollutants while slashing ventilation heat losses. It is SAP PCDB Listed and fully compliant with UK Building Regulations Part F and Part L.\n  \u003c\/p\u003e\n\n  \u003c!-- Stat Strip --\u003e\n  \u003cdiv style=\"display:flex; flex-wrap:wrap; gap:12px; margin-bottom:1.8em;\"\u003e\n    \u003cdiv style=\"flex:1; min-width:130px; background:#008377CF; color:#fff; border-radius:6px; padding:14px 16px; text-align:center;\"\u003e\n      \u003cdiv style=\"font-size:1.8em; font-weight:700;\"\u003e92%\u003c\/div\u003e\n      \u003cdiv style=\"font-size:0.82em; margin-top:4px;\"\u003eHeat Exchange Efficiency\u003c\/div\u003e\n    \u003c\/div\u003e\n    \u003cdiv style=\"flex:1; min-width:130px; background:#008377CF; color:#fff; border-radius:6px; padding:14px 16px; text-align:center;\"\u003e\n      \u003cdiv style=\"font-size:1.8em; font-weight:700;\"\u003e177 l\/s\u003c\/div\u003e\n      \u003cdiv style=\"font-size:0.82em; margin-top:4px;\"\u003eMax Airflow Capacity\u003c\/div\u003e\n    \u003c\/div\u003e\n    \u003cdiv style=\"flex:1; min-width:130px; background:#008377CF; color:#fff; border-radius:6px; padding:14px 16px; text-align:center;\"\u003e\n      \u003cdiv style=\"font-size:1.8em; font-weight:700;\"\u003e250 m²\u003c\/div\u003e\n      \u003cdiv style=\"font-size:0.82em; margin-top:4px;\"\u003eMax Property Size\u003c\/div\u003e\n    \u003c\/div\u003e\n    \u003cdiv style=\"flex:1; min-width:130px; background:#008377CF; color:#fff; border-radius:6px; padding:14px 16px; text-align:center;\"\u003e\n      \u003cdiv style=\"font-size:1.8em; font-weight:700;\"\u003e0.40\u003c\/div\u003e\n      \u003cdiv style=\"font-size:0.82em; margin-top:4px;\"\u003eSFP W\/l\/s (min)\u003c\/div\u003e\n    \u003c\/div\u003e\n    \u003cdiv style=\"flex:1; min-width:130px; background:#008377CF; color:#fff; border-radius:6px; padding:14px 16px; text-align:center;\"\u003e\n      \u003cdiv style=\"font-size:1.8em; font-weight:700;\"\u003e5 yr\u003c\/div\u003e\n      \u003cdiv style=\"font-size:0.82em; margin-top:4px;\"\u003eWarranty\u003c\/div\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003c!-- Callout: Installer --\u003e\n  \u003cdiv style=\"border-left:4px solid #c0392b; background:#fdf2f2; padding:14px 18px; border-radius:4px; margin-bottom:1.4em;\"\u003e\n    \u003cstrong style=\"color:#c0392b;\"\u003eInstaller Note:\u003c\/strong\u003e A clearance of \u003cstrong\u003e200 mm must be allowed on each side of the cabinet\u003c\/strong\u003e for access to the motors. Install vertically in a loft, cupboard, or utility space. The wall fixing bracket is supplied. This unit must be installed and commissioned by a competent person in accordance with Building Regulations Part F. If more than one light switch is used to trigger boost, each must be a double pole switch.\n  \u003c\/div\u003e\n\n  \u003c!-- Callout: Compatibility --\u003e\n  \u003cdiv style=\"border-left:4px solid #e67e22; background:#fef9f0; padding:14px 18px; border-radius:4px; margin-bottom:1.4em;\"\u003e\n    \u003cstrong style=\"color:#e67e22;\"\u003eCompatibility Note:\u003c\/strong\u003e The Maxi is compatible with the \u003cstrong\u003eVectaire Cool Breeze\u003c\/strong\u003e active cooling module for overheating mitigation (sold separately). Models with humidistat have factory-set handing; confirm left or right drain direction before ordering. Universal handing models can be configured on site.\n  \u003c\/div\u003e\n\n  \u003c!-- Callout: Info --\u003e\n  \u003cdiv style=\"border-left:4px solid #008377CF; background:#e6f4f3; padding:14px 18px; border-radius:4px; margin-bottom:1.8em;\"\u003e\n    \u003cstrong style=\"color:#005c54;\"\u003eSAP PCDB Listed — Passive House Certified Option Available.\u003c\/strong\u003e The Maxi is listed on the SAP Product Characteristics Database for straightforward Building Regulations compliance. A Passive House Certified version is optionally available, making it eligible for use in Passivhaus projects. Full specification downloads are available at vectaire.co.uk\/downloads.\n  \u003c\/div\u003e\n\n  \u003c!-- Feature Grid --\u003e\n  \u003cdiv style=\"background:#008377CF; color:#fff; padding:10px 16px; border-radius:4px 4px 0 0; font-weight:700; font-size:1.02em; margin-bottom:0;\"\u003eKey Features\u003c\/div\u003e\n  \u003cdiv style=\"display:grid; grid-template-columns:repeat(auto-fit, minmax(260px, 1fr)); gap:14px; margin-bottom:1.8em; padding:14px; background:#f0faf9; border:1px solid #c8e6e3; border-top:none; border-radius:0 0 4px 4px;\"\u003e\n\n    \u003cdiv style=\"background:#fff; border:1px solid #c8e6e3; border-radius:6px; padding:16px;\"\u003e\n      \u003cdiv style=\"font-weight:700; color:#008377; border-bottom:2px solid #008377; padding-bottom:6px; margin-bottom:10px;\"\u003e92% Counter-Flow Heat Recovery\u003c\/div\u003e\n      \u003cp style=\"margin:0; font-size:0.93em;\"\u003eThe Maxi's \u003cstrong\u003ecounter-flow heat exchanger reaches up to 92% thermal efficiency\u003c\/strong\u003e, capturing heat from warm stale air and transferring it directly to the incoming fresh supply. At a kitchen plus one wet room configuration under SAP 10, the exchanger delivers \u003cstrong\u003e92% efficiency at 0.45 W\/l\/s SFP\u003c\/strong\u003e — meeting the most demanding energy performance targets.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv style=\"background:#fff; border:1px solid #c8e6e3; border-radius:6px; padding:16px;\"\u003e\n      \u003cdiv style=\"font-weight:700; color:#008377; border-bottom:2px solid #008377; padding-bottom:6px; margin-bottom:10px;\"\u003eFully Automatic Summer Bypass\u003c\/div\u003e\n      \u003cp style=\"margin:0; font-size:0.93em;\"\u003eThe \u003cstrong\u003eautomatic summer bypass\u003c\/strong\u003e monitors internal and external temperatures and diverts fresh incoming air around the heat exchanger when outdoor conditions are cool enough to provide natural cooling. Setpoints are fully adjustable at commissioning. The bypass operates without user intervention, ensuring comfortable temperatures year-round.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv style=\"background:#fff; border:1px solid #c8e6e3; border-radius:6px; padding:16px;\"\u003e\n      \u003cdiv style=\"font-weight:700; color:#008377; border-bottom:2px solid #008377; padding-bottom:6px; margin-bottom:10px;\"\u003eIntegral Frost-Stat\u003c\/div\u003e\n      \u003cp style=\"margin:0; font-size:0.93em;\"\u003eThe \u003cstrong\u003ebuilt-in frost-stat\u003c\/strong\u003e proportionally reduces the intake fan speed as the external temperature falls between +3°C and −8°C, protecting the heat exchanger from icing and maintaining balanced operation throughout winter. This is a standard feature — no separate frost protection controller is required.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv style=\"background:#fff; border:1px solid #c8e6e3; border-radius:6px; padding:16px;\"\u003e\n      \u003cdiv style=\"font-weight:700; color:#008377; border-bottom:2px solid #008377; padding-bottom:6px; margin-bottom:10px;\"\u003eEC Brushless Motors — Low Noise, Low Energy\u003c\/div\u003e\n      \u003cp style=\"margin:0; font-size:0.93em;\"\u003e\u003cstrong\u003eHigh-quality EC brushless motors\u003c\/strong\u003e with forward curved impellers and direct drive deliver efficient, quiet airflow across five speed steps. At 100% (177 l\/s) the unit draws just 176 W; at 20% (23 l\/s) it uses only 4 W. \u003cstrong\u003eBreakout sound pressure at 3 m is 38.1 dBA at 100%\u003c\/strong\u003e and 20.2 dBA at 20% — independently tested to BS EN ISO 3743-1:2010.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv style=\"background:#fff; border:1px solid #c8e6e3; border-radius:6px; padding:16px;\"\u003e\n      \u003cdiv style=\"font-weight:700; color:#008377; border-bottom:2px solid #008377; padding-bottom:6px; margin-bottom:10px;\"\u003eIndependent Variable Speed Control\u003c\/div\u003e\n      \u003cp style=\"margin:0; font-size:0.93em;\"\u003eEach motor has \u003cstrong\u003eindependently adjustable trickle, boost, and purge speeds\u003c\/strong\u003e set during commissioning to match the specific ductwork installation. \u003cstrong\u003eBoost\u003c\/strong\u003e is activated via 230V switched live from a light switch, remote humidistat (DRH240), PIR (PIRFF), thermostat (THM), or pull cord. The adjustable over-run timer runs from 0 to 90 minutes; purge over-run from 0 to 250 minutes.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv style=\"background:#fff; border:1px solid #c8e6e3; border-radius:6px; padding:16px;\"\u003e\n      \u003cdiv style=\"font-weight:700; color:#008377; border-bottom:2px solid #008377; padding-bottom:6px; margin-bottom:10px;\"\u003eEPS Acoustic \u0026amp; Thermal Enhancement\u003c\/div\u003e\n      \u003cp style=\"margin:0; font-size:0.93em;\"\u003eThe steel casing incorporates \u003cstrong\u003eEPS (expanded polystyrene) internal components and foam construction lining\u003c\/strong\u003e, providing both acoustic dampening and thermal insulation around the heat exchanger core. This reduces heat loss from the unit body and keeps in-duct noise transmission low. The epoxy paint finish ensures a durable, clean appearance in any utility or loft space.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv style=\"background:#fff; border:1px solid #c8e6e3; border-radius:6px; padding:16px;\"\u003e\n      \u003cdiv style=\"font-weight:700; color:#008377; border-bottom:2px solid #008377; padding-bottom:6px; margin-bottom:10px;\"\u003eSmart Integration \u0026amp; Automation\u003c\/div\u003e\n      \u003cp style=\"margin:0; font-size:0.93em;\"\u003eFactory-set options include \u003cstrong\u003e0-10V connections for BMS integration, CO₂ detection, and home automation\u003c\/strong\u003e; a relay for an external pre-heater; a 3-speed selector switch; integral humidistat; and \u003cstrong\u003eholiday mode\u003c\/strong\u003e (default: 50% trickle speed when unoccupied). \u003cstrong\u003eRun-time and power outage counters\u003c\/strong\u003e are downloadable via QR code, aiding planned preventive maintenance.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv style=\"background:#fff; border:1px solid #c8e6e3; border-radius:6px; padding:16px;\"\u003e\n      \u003cdiv style=\"font-weight:700; color:#008377; border-bottom:2px solid #008377; padding-bottom:6px; margin-bottom:10px;\"\u003eCool Breeze Compatible\u003c\/div\u003e\n      \u003cp style=\"margin:0; font-size:0.93em;\"\u003eThe Maxi is designed for \u003cstrong\u003eseamless integration with the Vectaire Cool Breeze\u003c\/strong\u003e active cooling module. The Cool Breeze attaches directly to the Maxi's supply air path and uses R290 natural refrigerant to lower incoming supply air by up to 20°C, delivering up to 4.1 kW of cooling capacity without an external condenser. This combination satisfies CIBSE TM59 and Approved Document O requirements for overheating mitigation.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n  \u003c\/div\u003e\n\n  \u003c!-- Spec Table --\u003e\n  \u003cdiv style=\"background:#008377CF; color:#fff; padding:10px 16px; border-radius:4px 4px 0 0; font-weight:700; font-size:1.02em;\"\u003eTechnical Specifications\u003c\/div\u003e\n  \u003ctable style=\"width:100%; border-collapse:collapse; margin-bottom:1.8em; font-size:0.93em;\"\u003e\n    \u003ctbody\u003e\n      \u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 14px; border:1px solid #c8e6e3; font-weight:600; width:42%;\"\u003eMax Airflow Capacity\u003c\/td\u003e\n\u003ctd style=\"padding:9px 14px; border:1px solid #c8e6e3;\"\u003e177 l\/s (637 m³\/hr)\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:9px 14px; border:1px solid #c8e6e3; font-weight:600;\"\u003eAirflow at 50Pa\u003c\/td\u003e\n\u003ctd style=\"padding:9px 14px; border:1px solid #c8e6e3;\"\u003e163 l\/s\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 14px; border:1px solid #c8e6e3; font-weight:600;\"\u003eHeat Exchange Efficiency (max)\u003c\/td\u003e\n\u003ctd style=\"padding:9px 14px; border:1px solid #c8e6e3;\"\u003e92% (SAP 10: Kitchen + 1 wet room)\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:9px 14px; border:1px solid #c8e6e3; font-weight:600;\"\u003eSpecific Fan Power (SFP)\u003c\/td\u003e\n\u003ctd style=\"padding:9px 14px; border:1px solid #c8e6e3;\"\u003eDown to 0.40 W\/l\/s\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 14px; border:1px solid #c8e6e3; font-weight:600;\"\u003eTotal Power — 100% \/ 20%\u003c\/td\u003e\n\u003ctd style=\"padding:9px 14px; border:1px solid #c8e6e3;\"\u003e176 W \/ 4 W\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:9px 14px; border:1px solid #c8e6e3; font-weight:600;\"\u003eOperating Current\u003c\/td\u003e\n\u003ctd style=\"padding:9px 14px; border:1px solid #c8e6e3;\"\u003e1.41 A\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 14px; border:1px solid #c8e6e3; font-weight:600;\"\u003eAirflow Speeds (l\/s)\u003c\/td\u003e\n\u003ctd style=\"padding:9px 14px; border:1px solid #c8e6e3;\"\u003e177 \/ 138 \/ 99 \/ 60 \/ 23 (100–20%)\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:9px 14px; border:1px solid #c8e6e3; font-weight:600;\"\u003eBreakout Sound Pressure @ 3m\u003c\/td\u003e\n\u003ctd style=\"padding:9px 14px; border:1px solid #c8e6e3;\"\u003e38.1 dBA @ 100% · 20.2 dBA @ 20%\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 14px; border:1px solid #c8e6e3; font-weight:600;\"\u003eMax Operating Temperature\u003c\/td\u003e\n\u003ctd style=\"padding:9px 14px; border:1px solid #c8e6e3;\"\u003e60°C\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:9px 14px; border:1px solid #c8e6e3; font-weight:600;\"\u003eFrost-Stat Activation Range\u003c\/td\u003e\n\u003ctd style=\"padding:9px 14px; border:1px solid #c8e6e3;\"\u003e+3°C to −8°C (outside temperature)\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 14px; border:1px solid #c8e6e3; font-weight:600;\"\u003eBoost Over-Run Timer\u003c\/td\u003e\n\u003ctd style=\"padding:9px 14px; border:1px solid #c8e6e3;\"\u003e0–90 minutes (adjustable)\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:9px 14px; border:1px solid #c8e6e3; font-weight:600;\"\u003eRemote Purge Timer (optional)\u003c\/td\u003e\n\u003ctd style=\"padding:9px 14px; border:1px solid #c8e6e3;\"\u003e0–250 minutes (factory preset: 15 min)\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 14px; border:1px solid #c8e6e3; font-weight:600;\"\u003eFilter Grade\u003c\/td\u003e\n\u003ctd style=\"padding:9px 14px; border:1px solid #c8e6e3;\"\u003eG3 (disposable, easily accessible)\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:9px 14px; border:1px solid #c8e6e3; font-weight:600;\"\u003eDimensions (W × H × D)\u003c\/td\u003e\n\u003ctd style=\"padding:9px 14px; border:1px solid #c8e6e3;\"\u003e758 × 727 × 649 mm (incl. spigots)\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 14px; border:1px solid #c8e6e3; font-weight:600;\"\u003eWeight\u003c\/td\u003e\n\u003ctd style=\"padding:9px 14px; border:1px solid #c8e6e3;\"\u003e37 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:9px 14px; border:1px solid #c8e6e3; font-weight:600;\"\u003eDuct Connection Diameter\u003c\/td\u003e\n\u003ctd style=\"padding:9px 14px; border:1px solid #c8e6e3;\"\u003eØ149 mm (four spigots)\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 14px; border:1px solid #c8e6e3; font-weight:600;\"\u003eCasing\u003c\/td\u003e\n\u003ctd style=\"padding:9px 14px; border:1px solid #c8e6e3;\"\u003eSteel sheet, epoxy paint finish, EPS lining, foam construction\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:9px 14px; border:1px solid #c8e6e3; font-weight:600;\"\u003eHeat Exchanger Type\u003c\/td\u003e\n\u003ctd style=\"padding:9px 14px; border:1px solid #c8e6e3;\"\u003eCounter-flow\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 14px; border:1px solid #c8e6e3; font-weight:600;\"\u003eMotor Type\u003c\/td\u003e\n\u003ctd style=\"padding:9px 14px; border:1px solid #c8e6e3;\"\u003eEC brushless, direct drive, forward curved impellers\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:9px 14px; border:1px solid #c8e6e3; font-weight:600;\"\u003eSupply Voltage\u003c\/td\u003e\n\u003ctd style=\"padding:9px 14px; border:1px solid #c8e6e3;\"\u003e230V AC\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 14px; border:1px solid #c8e6e3; font-weight:600;\"\u003eWarranty\u003c\/td\u003e\n\u003ctd style=\"padding:9px 14px; border:1px solid #c8e6e3;\"\u003e5 years (1 year parts \u0026amp; labour, 4 years parts only)\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:9px 14px; border:1px solid #c8e6e3; font-weight:600;\"\u003eCertifications\u003c\/td\u003e\n\u003ctd style=\"padding:9px 14px; border:1px solid #c8e6e3;\"\u003eSAP PCDB Listed · CE Marked · ISO 9001:2015 · ISO 14001:2015 · EU RoHS · IEC60335-2-80\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 14px; border:1px solid #c8e6e3; font-weight:600;\"\u003eSound Testing Standard\u003c\/td\u003e\n\u003ctd style=\"padding:9px 14px; border:1px solid #c8e6e3;\"\u003eBS EN ISO 3743-1:2010 (independently tested)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\n  \u003c!-- Models --\u003e\n  \u003cdiv style=\"background:#008377CF; color:#fff; padding:10px 16px; border-radius:4px 4px 0 0; font-weight:700; font-size:1.02em;\"\u003eModels Available\u003c\/div\u003e\n  \u003cdiv style=\"border:1px solid #c8e6e3; border-top:none; padding:16px; background:#f0faf9; border-radius:0 0 4px 4px; margin-bottom:1.8em; font-size:0.93em;\"\u003e\n    \u003cul style=\"margin:0; padding-left:1.4em; line-height:2;\"\u003e\n      \u003cli\u003e\n\u003cstrong\u003eWHHR Maxi\/BY\u003c\/strong\u003e — Bypass, universal handing\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eWHHR Maxi\/BLH\u003c\/strong\u003e — Bypass, left drain, humidistat\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eWHHR Maxi\/BRH\u003c\/strong\u003e — Bypass, right drain, humidistat\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eMaxi BY+LCD\u003c\/strong\u003e — Bypass, universal, integral LCD commissioning unit\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eMaxi+LHHLCD\u003c\/strong\u003e — Bypass, left drain, humidistat, integral LCD\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eMaxi+RHHLCD\u003c\/strong\u003e — Bypass, right drain, humidistat, integral LCD\u003c\/li\u003e\n    \u003c\/ul\u003e\n  \u003c\/div\u003e\n\n  \u003c!-- FAQ --\u003e\n  \u003cdiv style=\"background:#008377CF; color:#fff; padding:10px 16px; border-radius:4px 4px 0 0; font-weight:700; font-size:1.02em;\"\u003eFrequently Asked Questions\u003c\/div\u003e\n  \u003cdiv style=\"border:1px solid #c8e6e3; border-top:none; border-radius:0 0 4px 4px; margin-bottom:1.8em; overflow:hidden;\"\u003e\n\n    \u003cdetails style=\"border-bottom:1px solid #c8e6e3;\"\u003e\n      \u003csummary style=\"background:#008377CF; color:#fff; padding:12px 16px; cursor:pointer; font-weight:600; list-style:none;\"\u003eWhat is the difference between the Maxi and the Maxi Plus BY?\u003c\/summary\u003e\n      \u003cdiv style=\"padding:14px 16px; background:#fff; font-size:0.93em;\"\u003eThe \u003cstrong\u003eMaxi\u003c\/strong\u003e is rated for properties up to \u003cstrong\u003e250 m²\u003c\/strong\u003e with a peak flow of 177 l\/s and up to 92% efficiency. The \u003cstrong\u003eMaxi Plus BY\u003c\/strong\u003e handles larger homes up to \u003cstrong\u003e400 m²\u003c\/strong\u003e with a higher peak flow of 238 l\/s. Both feature summer bypass and frost-stat as standard. The Maxi pairs with the \u003cstrong\u003eCool Breeze\u003c\/strong\u003e cooler; the Maxi Plus BY pairs with the \u003cstrong\u003eCool Breeze Plus\u003c\/strong\u003e.\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails style=\"border-bottom:1px solid #c8e6e3;\"\u003e\n      \u003csummary style=\"background:#008377CF; color:#fff; padding:12px 16px; cursor:pointer; font-weight:600; list-style:none;\"\u003eCan the Maxi be used in a Passivhaus project?\u003c\/summary\u003e\n      \u003cdiv style=\"padding:14px 16px; background:#fff; font-size:0.93em;\"\u003eYes. A \u003cstrong\u003ePassive House Certified option\u003c\/strong\u003e is available for the Maxi, making it compliant with Passivhaus Institut requirements. This is typically required for any dwelling targeting Passivhaus certification, where airtightness and heat recovery standards are significantly more demanding than standard Building Regulations.\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails style=\"border-bottom:1px solid #c8e6e3;\"\u003e\n      \u003csummary style=\"background:#008377CF; color:#fff; padding:12px 16px; cursor:pointer; font-weight:600; list-style:none;\"\u003eIs the Maxi suitable for new-build and retrofit installations?\u003c\/summary\u003e\n      \u003cdiv style=\"padding:14px 16px; background:#fff; font-size:0.93em;\"\u003eYes. The Maxi is designed for both \u003cstrong\u003enew-build and retrofit\u003c\/strong\u003e applications. Its compact footprint (758 × 727 × 649 mm including spigots) and vertical loft\/cupboard orientation make it adaptable to most existing properties. Casavent provides full design support including CAD drawings, airflow calculations, and commissioning guidance for both project types.\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails style=\"border-bottom:1px solid #c8e6e3;\"\u003e\n      \u003csummary style=\"background:#008377CF; color:#fff; padding:12px 16px; cursor:pointer; font-weight:600; list-style:none;\"\u003eHow is the Maxi commissioned and balanced?\u003c\/summary\u003e\n      \u003cdiv style=\"padding:14px 16px; background:#fff; font-size:0.93em;\"\u003eEach motor speed (trickle, boost, purge) is independently adjusted at installation to match the calculated airflow requirements of the ductwork system. An optional \u003cstrong\u003eintegral LCD or remote LCD commissioning unit\u003c\/strong\u003e is available for precise flow balancing. For best results, Vectaire recommends using rigid ducting and following the SAP PCDB tabulated configurations.\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary style=\"background:#008377CF; color:#fff; padding:12px 16px; cursor:pointer; font-weight:600; list-style:none;\"\u003eWhat accessories and support does Vectaire offer with the Maxi?\u003c\/summary\u003e\n      \u003cdiv style=\"padding:14px 16px; background:#fff; font-size:0.93em;\"\u003eVectaire can supply the complete system including \u003cstrong\u003efilter cassettes, silencers, fire dampers, air valves, ducting, outside grilles, and wall cowls\u003c\/strong\u003e. A ventilation design service is available to optimise unit selection and duct layout. Installation, commissioning, and ongoing maintenance services can also be arranged. Casavent provides independent advice on system design and full end-to-end project support.\u003c\/div\u003e\n    \u003c\/details\u003e\n\n  \u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"Vectaire","offers":[{"title":"Default Title","offer_id":64691605864797,"sku":"WHHR-Maxi-by-lcd","price":2370.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0958\/2051\/3629\/files\/VectaireMidiMVHRWholeHouseVentilationwithHeatRecoveryUnit.webp?v=1778757569","url":"https:\/\/qualityheating.co.uk\/products\/vectaire-maxi-mvhr-whole-house-ventilation-with-heat-recovery-unit","provider":"AIZO Quality Heating","version":"1.0","type":"link"}