{"product_id":"xpelair-simply-silent-100mm-contour-extractor-fan-humidistat-c4htsr-078360","title":"Xpelair Simply Silent 100mm Contour Extractor Fan Humidistat C4HTSR 078360","description":"\u003cdiv style=\"font-size:16px;font-family:Arial,sans-serif;color:#333;max-width:900px;margin:0 auto;line-height:1.6;\"\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eXpelair Simply Silent Contour Humidistat (C4HTSR, MPN 078360)\u003c\/strong\u003e is a \u003cstrong\u003e100mm near-silent bathroom extractor fan\u003c\/strong\u003e with \u003cstrong\u003eautomatic humidity-triggered control and an adjustable overrun timer\u003c\/strong\u003e. When relative humidity in the room rises above the set threshold — for example during a shower — the fan activates automatically \u003cstrong\u003ewithout needing a light switch signal\u003c\/strong\u003e. Once humidity drops back below the set point plus the timer overrun, it shuts off. Powered by Xpelair's \u003cstrong\u003eGhost™ Air Movement Technology\u003c\/strong\u003e, it achieves \u003cstrong\u003e15 dB(A) on low speed\u003c\/strong\u003e. Supplied with \u003cstrong\u003eboth square (180×180mm) and round (200mm Ø) fascias\u003c\/strong\u003e included, it suits new builds, extensions and refurbishments where moisture control needs to operate independently of occupancy.\u003c\/p\u003e\n\n\u003c!-- STAT STRIP --\u003e\n\u003cdiv style=\"display:flex;flex-wrap:wrap;gap:8px;margin:20px 0;\"\u003e\n  \u003cdiv style=\"background:#008377;color:#fff;padding:12px 16px;border-radius:6px;flex:1;min-width:120px;text-align:center;\"\u003e\n\u003cstrong style=\"font-size:18px;\"\u003e15 dB(A)\u003c\/strong\u003e\u003cbr\u003e\u003cspan style=\"font-size:12px;\"\u003eLow-speed noise\u003c\/span\u003e\n\u003c\/div\u003e\n  \u003cdiv style=\"background:#008377;color:#fff;padding:12px 16px;border-radius:6px;flex:1;min-width:120px;text-align:center;\"\u003e\n\u003cstrong style=\"font-size:18px;\"\u003e50–90% RH\u003c\/strong\u003e\u003cbr\u003e\u003cspan style=\"font-size:12px;\"\u003eHumidistat range\u003c\/span\u003e\n\u003c\/div\u003e\n  \u003cdiv style=\"background:#008377;color:#fff;padding:12px 16px;border-radius:6px;flex:1;min-width:120px;text-align:center;\"\u003e\n\u003cstrong style=\"font-size:18px;\"\u003e54\/76 m³\/h\u003c\/strong\u003e\u003cbr\u003e\u003cspan style=\"font-size:12px;\"\u003e2-speed airflow\u003c\/span\u003e\n\u003c\/div\u003e\n  \u003cdiv style=\"background:#008377;color:#fff;padding:12px 16px;border-radius:6px;flex:1;min-width:120px;text-align:center;\"\u003e\n\u003cstrong style=\"font-size:18px;\"\u003e6.3\/7W\u003c\/strong\u003e\u003cbr\u003e\u003cspan style=\"font-size:12px;\"\u003ePower draw\u003c\/span\u003e\n\u003c\/div\u003e\n  \u003cdiv style=\"background:#008377;color:#fff;padding:12px 16px;border-radius:6px;flex:1;min-width:120px;text-align:center;\"\u003e\n\u003cstrong style=\"font-size:18px;\"\u003eIPX4\u003c\/strong\u003e\u003cbr\u003e\u003cspan style=\"font-size:12px;\"\u003eIP rating\u003c\/span\u003e\n\u003c\/div\u003e\n  \u003cdiv style=\"background:#008377;color:#fff;padding:12px 16px;border-radius:6px;flex:1;min-width:120px;text-align:center;\"\u003e\n\u003cstrong style=\"font-size:18px;\"\u003e2 Years\u003c\/strong\u003e\u003cbr\u003e\u003cspan style=\"font-size:12px;\"\u003eWarranty\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003c!-- CALLOUTS --\u003e\n\u003cdiv style=\"background:#f8d7da;border-left:4px solid #c0392b;padding:12px 16px;border-radius:4px;margin:12px 0;\"\u003e\n  \u003cstrong\u003eWiring — 3-Core Required:\u003c\/strong\u003e The \u003cstrong\u003eC4HTSR requires a 3-core feed\u003c\/strong\u003e (Live, Neutral, and a switched Live from the lighting circuit for the Timer function). The humidistat operates the fan independently of the switch, but the switched live is still needed for the overrun timer circuit. Always isolate the supply and verify dead before wiring. The \u003cstrong\u003eprotective fuse must not exceed 5A\u003c\/strong\u003e. Connect via a \u003cstrong\u003edouble-pole isolating switch\u003c\/strong\u003e with at least 3mm contact separation.\n\u003c\/div\u003e\n\u003cdiv style=\"background:#d4edda;border-left:4px solid #008377;padding:12px 16px;border-radius:4px;margin:12px 0;\"\u003e\n  \u003cstrong\u003eSetting the Humidistat:\u003c\/strong\u003e The factory preset is \u003cstrong\u003eapproximately 75% RH\u003c\/strong\u003e. Adjust using \u003cstrong\u003econtrol H\u003c\/strong\u003e inside the fan body — clockwise increases the trigger threshold (fan activates at higher humidity), anti-clockwise lowers it. For a condensation-prone bathroom, set towards \u003cstrong\u003e60–70% RH\u003c\/strong\u003e so the fan activates early in the shower cycle. The timer overrun (control T) is independent and set between \u003cstrong\u003e30 seconds and 30 minutes\u003c\/strong\u003e.\n\u003c\/div\u003e\n\n\u003c!-- FEATURE CARDS --\u003e\n\u003cdiv style=\"display:flex;flex-wrap:wrap;gap:16px;margin:24px 0;\"\u003e\n\n  \u003cdiv style=\"flex:1;min-width:255px;border:1px solid #ddd;border-radius:6px;padding:16px;border-top:3px solid #008377;\"\u003e\n    \u003cstrong style=\"color:#008377;\"\u003eAutomatic Humidity Control\u003c\/strong\u003e\n    \u003cp style=\"margin:8px 0 0;\"\u003eThe integrated \u003cstrong\u003ehumidistat sensor (50–90% RH range)\u003c\/strong\u003e continuously monitors room moisture levels. When humidity rises above the set point — such as when a shower starts — the fan activates automatically, even if the room light is off. This prevents condensation from building up during \u003cstrong\u003eunoccupied humid periods\u003c\/strong\u003e, protecting surfaces, grout and plasterwork.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv style=\"flex:1;min-width:255px;border:1px solid #ddd;border-radius:6px;padding:16px;border-top:3px solid #008377;\"\u003e\n    \u003cstrong style=\"color:#008377;\"\u003eGhost™ Air Movement Technology\u003c\/strong\u003e\n    \u003cp style=\"margin:8px 0 0;\"\u003eIdentical to the timer-only model, Ghost technology delivers \u003cstrong\u003e15 dB(A) at low speed\u003c\/strong\u003e — effectively inaudible in normal domestic environments. When the humidistat triggers the fan at night, occupants are not disturbed. High speed delivers \u003cstrong\u003e29 dB(A)\u003c\/strong\u003e, still significantly quieter than a conventional extractor.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv style=\"flex:1;min-width:255px;border:1px solid #ddd;border-radius:6px;padding:16px;border-top:3px solid #008377;\"\u003e\n    \u003cstrong style=\"color:#008377;\"\u003eHumidistat + Timer Combination\u003c\/strong\u003e\n    \u003cp style=\"margin:8px 0 0;\"\u003eBoth the \u003cstrong\u003ehumidistat and the overrun timer operate simultaneously\u003c\/strong\u003e. The humidistat keeps the fan running as long as humidity exceeds the threshold; when humidity drops, the timer then runs for the set overrun period. This dual mechanism ensures the fan continues long enough to fully clear residual moisture, not just until the humidity drops to the detection threshold.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv style=\"flex:1;min-width:255px;border:1px solid #ddd;border-radius:6px;padding:16px;border-top:3px solid #008377;\"\u003e\n    \u003cstrong style=\"color:#008377;\"\u003eSquare + Round Fascias Included\u003c\/strong\u003e\n    \u003cp style=\"margin:8px 0 0;\"\u003eBoth a \u003cstrong\u003econtoured 180×180mm square fascia\u003c\/strong\u003e and a \u003cstrong\u003e200mm Ø round fascia\u003c\/strong\u003e are supplied. The smooth, rounded edges of the contour design are easy to wipe clean and resist the moisture-accelerated mould growth that can affect older flat-grille fans. The white gloss ABS finish complements contemporary bathroom tile and sanitaryware.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv style=\"flex:1;min-width:255px;border:1px solid #ddd;border-radius:6px;padding:16px;border-top:3px solid #008377;\"\u003e\n    \u003cstrong style=\"color:#008377;\"\u003eIntegral Backdraught Shutter\u003c\/strong\u003e\n    \u003cp style=\"margin:8px 0 0;\"\u003eThe \u003cstrong\u003ebuilt-in backdraught shutter\u003c\/strong\u003e closes when the fan stops, whether triggered by the light switch circuit turning off or by the humidistat dropping below threshold. Cold air ingress through the duct run is eliminated, reducing heat loss and preventing condensation from forming inside the duct in winter.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv style=\"flex:1;min-width:255px;border:1px solid #ddd;border-radius:6px;padding:16px;border-top:3px solid #008377;\"\u003e\n    \u003cstrong style=\"color:#008377;\"\u003eTwo-Speed Motor, Selectable at Fit\u003c\/strong\u003e\n    \u003cp style=\"margin:8px 0 0;\"\u003eThe \u003cstrong\u003e2-speed motor (15\/21 l\/s)\u003c\/strong\u003e is set during installation by a link inside the housing. Once set, the fan runs at the selected speed whenever activated by the humidistat or the light switch. The low SFP of \u003cstrong\u003e0.42\/0.33 W\/l\/s\u003c\/strong\u003e means energy consumption over the fan's lifetime is very low despite automatic operation.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n\u003c\/div\u003e\n\n\u003c!-- SPEC TABLE --\u003e\n\u003ch3 style=\"color:#008377;border-bottom:2px solid #008377;padding-bottom:6px;\"\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable style=\"width:100%;border-collapse:collapse;font-size:15px;\"\u003e\n  \u003ctbody\u003e\n    \u003ctr style=\"background:#008377;color:#fff;\"\u003e\u003ctd colspan=\"2\" style=\"padding:8px;font-weight:bold;\"\u003eFan Performance\u003c\/td\u003e\u003c\/tr\u003e\n    \u003ctr style=\"background:#f2f2f2;\"\u003e\n\u003ctd style=\"padding:8px;font-weight:bold;width:40%;\"\u003eMPN\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e078360\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd style=\"padding:8px;font-weight:bold;\"\u003eModel\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003eC4HTSR (Simply Silent Contour Humidistat\/Timer)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#f2f2f2;\"\u003e\n\u003ctd style=\"padding:8px;font-weight:bold;\"\u003eSpeeds\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e2 (selectable at installation)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd style=\"padding:8px;font-weight:bold;\"\u003eExtract Rate — Low Speed\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e15 l\/s \/ 52 m³\/h\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#f2f2f2;\"\u003e\n\u003ctd style=\"padding:8px;font-weight:bold;\"\u003eExtract Rate — High Speed\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e21 l\/s \/ 76 m³\/h\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd style=\"padding:8px;font-weight:bold;\"\u003eSound Level — Low Speed @ 3m\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e15 dB(A)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#f2f2f2;\"\u003e\n\u003ctd style=\"padding:8px;font-weight:bold;\"\u003eSound Level — High Speed @ 3m\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e29 dB(A)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd style=\"padding:8px;font-weight:bold;\"\u003eElectrical Power\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e6.3W (low) \/ 7W (high)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#f2f2f2;\"\u003e\n\u003ctd style=\"padding:8px;font-weight:bold;\"\u003eSpecific Fan Power (SFP)\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e0.42 W\/l\/s (low) \/ 0.33 W\/l\/s (high)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd style=\"padding:8px;font-weight:bold;\"\u003eMotor Type\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003eAC\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#f2f2f2;\"\u003e\n\u003ctd style=\"padding:8px;font-weight:bold;\"\u003eIP Rating\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003eIPX4 (Zone 1 with 30mA RCD; Zone 2)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#008377;color:#fff;\"\u003e\u003ctd colspan=\"2\" style=\"padding:8px;font-weight:bold;\"\u003eHumidity \u0026amp; Timer Controls\u003c\/td\u003e\u003c\/tr\u003e\n    \u003ctr style=\"background:#f2f2f2;\"\u003e\n\u003ctd style=\"padding:8px;font-weight:bold;\"\u003eHumidistat Range\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e50% – 90% RH (adjustable)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd style=\"padding:8px;font-weight:bold;\"\u003eHumidistat Factory Default\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003eApprox. 75% RH\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#f2f2f2;\"\u003e\n\u003ctd style=\"padding:8px;font-weight:bold;\"\u003eTimer Range\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e30 seconds – 30 minutes\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd style=\"padding:8px;font-weight:bold;\"\u003eTimer Factory Default\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e15 minutes\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#f2f2f2;\"\u003e\n\u003ctd style=\"padding:8px;font-weight:bold;\"\u003eWiring Cores Required\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e3-core (L, N, T)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#008377;color:#fff;\"\u003e\u003ctd colspan=\"2\" style=\"padding:8px;font-weight:bold;\"\u003eDimensions \u0026amp; Fitment\u003c\/td\u003e\u003c\/tr\u003e\n    \u003ctr style=\"background:#f2f2f2;\"\u003e\n\u003ctd style=\"padding:8px;font-weight:bold;\"\u003eSquare Fascia Size\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e180 × 180mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd style=\"padding:8px;font-weight:bold;\"\u003eRound Fascia Diameter\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e200mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#f2f2f2;\"\u003e\n\u003ctd style=\"padding:8px;font-weight:bold;\"\u003eBody Depth (fitted)\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e44.5mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd style=\"padding:8px;font-weight:bold;\"\u003eRear Spigot Diameter\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e98mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#f2f2f2;\"\u003e\n\u003ctd style=\"padding:8px;font-weight:bold;\"\u003eMounting\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003eWall, ceiling, panel or window\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd style=\"padding:8px;font-weight:bold;\"\u003eSupply Voltage\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e230V AC, 50Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#f2f2f2;\"\u003e\n\u003ctd style=\"padding:8px;font-weight:bold;\"\u003eMax Fuse Rating\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e5A\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd style=\"padding:8px;font-weight:bold;\"\u003eBackdraught Shutter\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003eIntegral\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#f2f2f2;\"\u003e\n\u003ctd style=\"padding:8px;font-weight:bold;\"\u003eColour \/ Finish\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003eWhite \/ Gloss ABS\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd style=\"padding:8px;font-weight:bold;\"\u003eCompliance\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003eBuilding Regs Parts F \u0026amp; L\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#f2f2f2;\"\u003e\n\u003ctd style=\"padding:8px;font-weight:bold;\"\u003eWarranty\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e2 years (Xpelair UK)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003c!-- FAQ --\u003e\n\u003ch3 style=\"color:#008377;border-bottom:2px solid #008377;padding-bottom:6px;margin-top:28px;\"\u003eFrequently Asked Questions\u003c\/h3\u003e\n\n\u003cdetails style=\"border:1px solid #ddd;border-radius:4px;margin:8px 0;\"\u003e\n  \u003csummary style=\"background:#008377;color:#fff;padding:10px 14px;cursor:pointer;font-weight:bold;border-radius:4px;\"\u003eDoes the humidistat model still need to be wired to the light switch?\u003c\/summary\u003e\n  \u003cdiv style=\"padding:12px 16px;\"\u003e\u003cp\u003eYes. The C4HTSR still requires a \u003cstrong\u003e3-core wiring connection including a switched live (T terminal)\u003c\/strong\u003e from the room light switch. The humidistat operates the fan independently of the switch — activating and deactivating based on humidity regardless of whether the light is on or off — but the timer overrun function still needs the switched signal to know when to begin counting down. The fan can operate in \u003cstrong\u003ehumidistat-only mode\u003c\/strong\u003e if preferred; refer to the wiring diagram supplied with the fan.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails style=\"border:1px solid #ddd;border-radius:4px;margin:8px 0;\"\u003e\n  \u003csummary style=\"background:#008377;color:#fff;padding:10px 14px;cursor:pointer;font-weight:bold;border-radius:4px;\"\u003eWhat RH level should I set the humidistat to?\u003c\/summary\u003e\n  \u003cdiv style=\"padding:12px 16px;\"\u003e\u003cp\u003eThe \u003cstrong\u003efactory preset of ~75% RH\u003c\/strong\u003e is suitable for most bathrooms. For a room that suffers persistent condensation on walls or mirrors, reduce the threshold to \u003cstrong\u003e60–70% RH\u003c\/strong\u003e so the fan activates earlier in the shower cycle. For a well-ventilated room where the fan runs too frequently, increase to \u003cstrong\u003e80–85% RH\u003c\/strong\u003e. Adjust in small increments and allow a week of use before re-evaluating. The range is \u003cstrong\u003e50% to 90% RH\u003c\/strong\u003e.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails style=\"border:1px solid #ddd;border-radius:4px;margin:8px 0;\"\u003e\n  \u003csummary style=\"background:#008377;color:#fff;padding:10px 14px;cursor:pointer;font-weight:bold;border-radius:4px;\"\u003eWhen should I choose the Humidistat over the Timer-only model?\u003c\/summary\u003e\n  \u003cdiv style=\"padding:12px 16px;\"\u003e\u003cp\u003eChoose the \u003cstrong\u003eHumidistat (C4HTSR)\u003c\/strong\u003e when: the bathroom is used at unpredictable times (e.g. a guest bathroom or en-suite), when moisture control is needed independently of the light, or when the room is prone to condensation. Choose the \u003cstrong\u003eTimer-only (C4TSR)\u003c\/strong\u003e when a simple, lower-cost solution is adequate and the bathroom is always used with the light on. The humidistat adds automatic, intelligent control that is particularly valuable in rooms without opening windows.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails style=\"border:1px solid #ddd;border-radius:4px;margin:8px 0;\"\u003e\n  \u003csummary style=\"background:#008377;color:#fff;padding:10px 14px;cursor:pointer;font-weight:bold;border-radius:4px;\"\u003eWill the humidistat cause the fan to run continuously in a very humid climate?\u003c\/summary\u003e\n  \u003cdiv style=\"padding:12px 16px;\"\u003e\u003cp\u003eIn areas with consistently high ambient humidity (above the set threshold), the humidistat could trigger frequent or prolonged operation. In UK conditions this is uncommon indoors, but if it occurs, \u003cstrong\u003eraise the RH threshold\u003c\/strong\u003e using control H until the fan operates only during showering. Alternatively, switch to the \u003cstrong\u003eTimer-only (C4TSR)\u003c\/strong\u003e model, which operates solely on the light switch circuit and is unaffected by ambient humidity.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails style=\"border:1px solid #ddd;border-radius:4px;margin:8px 0;\"\u003e\n  \u003csummary style=\"background:#008377;color:#fff;padding:10px 14px;cursor:pointer;font-weight:bold;border-radius:4px;\"\u003eCan this fan be used in a loft room bathroom without an opening window?\u003c\/summary\u003e\n  \u003cdiv style=\"padding:12px 16px;\"\u003e\u003cp\u003eYes, and this is an ideal application. \u003cstrong\u003eApproved Document Part F\u003c\/strong\u003e requires mechanical extract in bathrooms without openable windows; the C4HTSR's humidistat ensures the fan activates automatically whenever moisture levels rise, meeting the spirit of Part F even without occupant action. Ensure the duct run exits through the roof or a wall to outside air and is as short and straight as possible for maximum airflow performance.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003c\/div\u003e","brand":"Xpelair","offers":[{"title":"Default Title","offer_id":64930172993885,"sku":"078360","price":67.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0958\/2051\/3629\/files\/XpelairSimplySilent100mmContourExtractorFanTimer078346.jpg?v=1780990348","url":"https:\/\/qualityheating.co.uk\/products\/xpelair-simply-silent-100mm-contour-extractor-fan-humidistat-c4htsr-078360","provider":"AIZO Quality Heating","version":"1.0","type":"link"}