MORI WMF100 E Sub Floor Weatherproof Extract Fan 100mm

The Elta MORI WMF100-E is a weatherproof sub floor extract fan that fixes to the outside wall over a 100mm core and runs continuously to draw damp, stale air out of the void under suspended floors. It moves 43 m³/h (12 l/s) at its trickle setting and up to 61 m³/h (17 l/s) on boost.The single phase EC brushless motor has integral thermal protection and ball bearings, and draws only 1.5 W to 7 W. The removable cowl and the fixed wall baseplate are galvanised steel, it works from -20°C to +40°C, and Elta estimate £8.76 a year to run at trickle speed (20p per kWh). Made in the UK with a 5 year Elta warranty. 1 Phase EC Motor Up to 61 m³/h Speed Controllable What it is best used forSuspended timber floors with poor natural ventilation, where blocked or too few airbricks have led to damp, condensation, timber rot or musty smells, and sub floor voids that need radon control. Because it sits outside the building it can be fitted and maintained without lifting floorboards.It is for clean air only and not a substitute for a designed radon sump system where survey results call for one. Elta stress their layouts are conceptual, so design responsibility for the sub floor scheme stays with the installer or designer.Why choose this over alternativesFans that live inside the sub floor void are awkward to reach and service. The MORI sits on the outside wall, with the fan assembly easy to disconnect and withdraw for cleaning, and the trickle and boost speeds are set on the PCB to suit the void.Elta recommend pairing it with the Elta MORI WMF100-S supply fan as the best option: one on each side or diagonally opposite corners gives a controlled airflow path across the whole void regardless of wind.Installation notes Core a 100mm (4 inch) hole through the wall into the sub floor void. The hole centre must be at least 104mm above ground level. Fix the unit to the wall through the 4 corner holes so the foam strip seals against the wall. Silicone can be added for extra protection. Power can enter from either side or the rear. Fit an omnipolar isolator with at least 3mm contact separation and protect the circuit with an RCD. Set the trickle speed on the "Low" potentiometer and the boost speed on the "Boost" potentiometer (factory set to full). Boost runs when an external switch closes. Fit it centrally on one side or at a corner, with airbricks spread around the rest of the perimeter, and provide transfer openings through any sleeper walls. You'll also need Elta MORI WMF100-S sub floor supply fan recommended by Elta for a complete supply and extract system. Browse more extractor fans or Elta fans, or call us for help choosing the right fan.Specifications Model MORI WMF100-E Type Weatherproof sub floor extract fan Wall opening 100mm core Max airflow 61 m³/h (17 l/s) boost Static pressure Not published Motor Single phase EC brushless with thermal protection, 220-240V 50Hz Power 1.5 W minimum, 5 W trickle, 7 W boost Noise Below 10 dB(A) minimum, below 35 dB(A) trickle, below 43 dB(A) boost at 3m Operating temperature -20°C to +40°C Warranty 5 Year Manufacturer Airflow by speed 14 m³/h (4 l/s) minimum, 43 m³/h (12 l/s) trickle, 61 m³/h (17 l/s) boost Running cost £2.63 minimum, £8.76 trickle, £12.26 boost per year at 20p per kWh Construction Galvanised steel cowl and wall baseplate, UL94V-0 thermoplastic fan housing Dimensions 203 x 213.8 x 99.7mm Elta code ET-050001/A Made in UK Manuals & Guides Elta MORI WMF100-E Datasheet Elta MORI WMF Installation Guide