Replacing ineffective bathroom extractor fan - advise please

here we go . Yellow cable should be ur switched live needed for timer. You ned to fit a 3 pole isolator switch and the red cable is the permanent live.The fan needs to be outside zones if in the bathroom and be RCD protected. think its notifiable to building regs cos its in bathroom!!!

 

Build regs!! Bog off!

 

so its OK to lectricte members of ye family then?

 

It will be in the loft so outside all zones!

Gable/soffit, your choice really, but prob best to go with shortest run which looks like gable from your photos. Flexi duct will be ok, just don't leave too much slack.
If going through gable, then will obviously need a diamond core drill. If at ground(ish) level then usually best to drill in slightly from the outside to prevent face of brick being blown off but don't bother at that height, just go carefully through both skins from loft side.

 

Put a 400mm 8mm drill bit through wall first, then you will know your hole will line if you core from both side, also have a slight downward angle to the outside for the pipe, any moisture can drain to the outside.

 

I'd say vent through soffit - much easier to cut the hole. Be interested to hear your feedback after this upgrade because I have the same fan for my bathroom, and yes its c**p and I've been considering the same manrose MF100 fan. I should let the sparkies answer the electrical question, because I'm DIY and don't usually answer leccy questions, but I suspect you may well find that the red is permanent live, the yellow is switched live and the blue and G/Y normal neutral and earth. I suspect that you won't have to change any wiring, just disconnect the old fan and wire the new fan in to perm live, switched live, neutral as the instructions. According to the info I have looked up, the Manrose Mf100 doesn't have an earth connection as its double insulated.

I would mount a baseboard and install the fan and the junction box to it - don't like to see "floating" JB's

 

Looking at replacing our rubbish inline fan that is attic for bathroom. It is rubbish and sounds like a jet!

 

Other option is to vent out through roof;

Connect flexi hose to 110mm soil pipe, position pipe near roof timbers or add batons and fix with pipe clips

Soil pipe exits roof via a weathering slate, cap on top

Insulate soil pipe with foil blanket, bubble wrap etc to help prevent steam condensing on pipe in cold weather - or you can fit a condensate trap and vent outside via 21mm overflow pipe

Use a roofer to fit weathering slate, work with him with you in the loft doing the inside stuff and fitting the soil pipe up through the roof. This will reduce the costs for you, just means getting ur hands a little dirty !

 

Don't forget the distance/thickness of the wall/cavity when worrying about the 500mm.

Regarding hole, have a gander outside to make sure you're not going to hit anything screwed to the wall then put a pilot drill straight through, take another look outside then go through with your core drill

 

I generally use a gravity flap grill on outside.


Core drill the hole.
Take the flaps off the grill.
Fit flexi hose to the grill.
Insert carefully through wall until the grill sits flat making sure it's the right way up.
Drill through fixing holes.
Insert and tap in rawl plugs then screw tight.
Refit flaps and check they're free to move.
Silicon across top and sides.
Connect hose to fan in loft.
Job done

 

How quiet is that inline fan? Also, powerful?

 

Let us know how u get on

 

Whatever makes it easier. Don't take risks being at height on a ladder

 

Thanks