Smith and Low have been here for eternity, and always have the thing that nobody else stocks. Great shop with very helpful and knowledgeable staff. Don't know what I do if they ever closed, which I hope they never do.
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This model incorporates an automatic condensation (humidity) sensor which automatically switches the fan on when the condensation level builds up. Once the condensation clears the fan automatically switches off. Additionally there is a pull-cord that can be used to over-ride the humidity sensor and switch the fan on. This model is normally used in toilet or bathroom locations (outwith zone 2).
Dimensions: 155mm wide x 155mm tall x 40mm deep (beyond installed surface). 98mm diameter spigot, extends for 80mm. For connection to 100mm / 4 inch ducting
Airvent 459318A