Bathroom Exhaust Fans

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Bathroom Exhaust Fans Buying Guide A bathroom exhaust fan removes steam and moisture before it settles on walls and ceilings, which helps prevent condensation, peeling paint and mould. This collection includes exhaust fans from Fanco and Martec, plus 3-in-1 heater, light and fan units from Martec and Eglo, for powder rooms through to large family bathrooms. What size exhaust fan do I need? Work out the room volume (length x width x ceiling height) and multiply it by about 15 air changes an hour for a bathroom with a shower. A bathroom of 3 x 2 metres with a 2.5 metre ceiling holds 15 cubic metres, so it needs a fan of about 225 cubic metres an hour. The fans here range from 100 cubic metres an hour on the Fanco Dynamic 100mm, through 390 on the Martec Flow 265mm and 482 on the Fanco Hybrid 250, to 600 on the Martec Flow 315mm. Choose a little more capacity than you need to allow for bends in the duct. Does a bathroom exhaust fan need to vent outside? Yes. Ducting the fan to the outside carries the moisture out of the home, rather than into the roof space where it can cause damp. Match the duct to the fan: the Fanco Dynamic is made in 100mm, 125mm and 150mm versions, the Martec Saturn 270mm takes 100mm, the Martec Flow takes 125mm or 150mm, and the Fanco Hybrid 250 takes 150mm. Keep the duct as short and straight as possible. Replacement air also needs a way in, so leave a gap of about 20mm under the door. Where should the fan go, and what IP rating do I need? Place the fan near the shower, on the side of the room away from the door, so air is drawn across the room. The zone directly above a shower has its own rules under AS/NZS 3000, so your electrician should confirm the position and the IP rating needed. The Fanco Dynamic is rated IP24, the Fanco Hybrid 250 and Martec Saturn are IPX4, and the Martec Flow is IPX2. How quiet are bathroom exhaust fans? The quietest fans here are the Fanco Dynamic at 34 dB(A) and the Fanco Hybrid 250 at 36 dB(A). The Martec Flow is un