The MVDC-MSH unit from Vent-Axia features three fully variable speeds: normal, boost and purge. The unit can extract up to 118l/s and has 7 years warranty. The digital display allows installers to accurately set airflow, ensuring exactly the right ventilation rate. Accurate speed control helps minimise noise and energy consumption. This model incorporates a built-in humidity sensor, so that the unit boosts when humidity reaches a certain threshold. Ideal for loft or cupboard mounting. Perfect for multi-room extract ventilation. Boosted via light switch (switch live) or wired/wireless boost switch. Is your loft cold or warm? (cold has only some insulation in the floor) - if the answer is cold, you will insulated ducting to avoid warm air condensing in the ducting before it is expelled. CALL US to discuss you project on 0330 223 6776