fan ducting and vent cover that can be fitted from inside?

[sparkybird]

Not sure if I was dreaming but I'm sure someone told me that these exist!

Can some very helpful person point me in the right direction - its for a 4" through the wall bathroom fan.

I've tried googling, but not got anywhere

Cheers

SB

 

[bernardgreen]

Not sure if I was dreaming but I'm sure someone told me that these exist!

They do but are hard to find.

It can be done with an ordinary one an a bit of improvisation if you can get some access at ground level below where the hole in the wall will be.

Make the hole in the wall from inside. Assemble the external grill onto a length of 4 inch solid ducting with the angle the same as the angle of the hole in the wall and about three inches longer that the hole in the wall. Put a mark on the end of the duct at the bottom so you can tell which wy the grill is when it is on the wall.


Lower a length of thin cord through the hole so it reaches the ground, Thread it through the duct and the grill and then back through a different slot in the grill, Tie the end into a loop that is several inches longer that the hole through the wall. Now you can pull the duct and grill upto the outside of the hole. With a dainty hand through the hole manouver the duct through the hole and check it looks OK from outside. If necessary lower and adjust. When all is OK lower it again and add suitable glue / sealant to the insided face of the grill so it will stick and sealthe wall.

Pull it back up, put it in place and allow time for glue to fix it to the wall. Kep tension on the string to hold the grill in place. When set cut the loop and remove string. Fit internal fan and be ventilated.

 

[sparkybird]

Hi Bernard

That's a very nifty solution and one I may well employ f I can't find the impossible!

Cheers

SB

 

[17thman]

http://www.fastlec.co.uk/high-rise-round-cowled-kit-100mm-p-1559.html

 

[sparkybird]

17th - Hey thanks for confirming that I wasn't dreaming!

Cheers for the link, that's perfect!

SB

 

[ColJack]

that looks vaguely rude..

they do a vent cover that folds in half to pass through the duct, same thing with the string and glue..

 

[ban-all-sheds]

How do you get a nice clean round hole in the outer leaf for the glans^H^H^H^H^H rubber sealing rings to seal against?

 

[ColJack]

do core drills make that much of a mess of the wall?

 

[RF Lighting]

Proper diamond corers usually leave an almost perfect exit wound.

 

[ban-all-sheds]

Depends on type and quality of any external rendering/cladding, I imagine.

But yes - a good core drill. Which will have to be kept in alignment going from inner to outer leaf.

An important factor is what are the walls made of - how long will it take to cut the hole? If both leaves are lightweight block then it shouldn't be too bad, but as even from inside it will probably mean standing on some sort of platform holding a big SDS drill at head height trying not to let it drop even a tiny amount because when it does it binds in the hole and twists your wrists before the clutch kicks in, then a prolonged period of that because you're going through brick becomes a nightmare.

 

[RF Lighting]

It certainly is something that takes practice and patience!!

The worst thing is it the wall is damp as all the 'dust' binds together, clogs the corer and jams the drill

I have spent an entire day getting a 2" corer through a wall for a large SWA before now. That gets very monotonous quicker than you'd imagine...

 

[Adam_151]

The correct solution of course is to get the apprentice to do the coring.... its easier on the arms that way

On bigger jobs, its often worked out at the contracts stage that its better to have the main contractors labourers do the coring, rather than have electricians or plumbers being paid to do it