4in Low Voltage bathroom fan.

[J.C.E]

I have checked the core cutter I have been issued and it has a 4.5inch core bit. The fan I am putting in is 4in (100mm) does it matter if its slightly bigger hole, as the fan square itself will still be big enough to hide this.

Also trying to get my head around why I need to get a permanent live and a SL from the light.

This was my thinking:

SL AND neutral from light. To a 3a fused spur (SL+N). Into 12v transformer (SL+N). To Fan.

Why do I need a permanent live if I want the fan to come on when the light comes on?

 

[truckster]

Permanent live powers the over run on a timer fan

 

[J.C.E]

Permanent live powers the over run on a timer fan

And if it doesn't have a over run....

 

[Jay Sparks]

It will have a pull cord, and only require L and N

 

[J.C.E]

It will have a pull cord, and only require L and N

no pull cord. want it to come on with bathroom light. so sl and n from that.

 

[telectrix]

could always employ a punka wallah.

 

[J.C.E]

could always employ a punka wallah.

Not for me, so not my call to make...

Back on point,,,

will the 4.5in hole and 4in fan be a problem?

 

[telectrix]

not if you've got a gun and a couple of tubes of sealer. or the dreaded expanding foam.

 

[Dean Smith]

You will need the extra space as the sleeve/duct that needs to go in the hole is bigger than the fan.

 

[J.C.E]

not if you've got a gun and a couple of tubes of sealer. or the dreaded expanding foam.

will I even need this. 4 fixing in each corner of the fan will fix it to the wall?

 

[greengrass66]

u shouldnt need it as dean says the ducting/pipe will need the extra room

 

[Marvo]

The fan won't be a problem in a hole that's 1/2 inch oversized as long as the square front fascia covers the hole. You need a duct tube or flexible ducting between the fan and the discharge louver otherwise you'll create a damp problem by blowing steam and moisture into the wall cavity.

 

[J.C.E]

The fan won't be a problem in a hole that's 1/2 inch oversized as long as the square front fascia covers the hole. You need a duct tube or flexible ducting between the fan and the discharge louver otherwise you'll create a damp problem by blowing steam and moisture into the wall cavity.

Yup the wall kits we have on van stock come with these...nice shiney silver ones

 

[gutterball]

you need a 107mm core