external vent for bathroom extractor fan - any regulations?

[renol]

I have just had extractor fans added to bathrooms, kitchen and utility in my completely remodernised house and I am wondering if there are any building regs that the electrician should have adhered to regarding the vent cover on the external rendered wall.
Im currently getting lots of freezing air coming through the vent hole created for the vent, plus the fins inside are permanently turning from the wind coming in, which is a very uncomfortable nightmare. It is exactly the same as having the window permanently wide open.
So the hole in the wall outside has been very badly covered with a plastic grille (which has insect mesh on it, only after i insisted), which does nothing to stop the freezing air gushing into my house.
I only want to know if this would be covered by building regs in any way, so i know if the electrician is obliged to change it, or if they are allowed to only put on these £2 vents externally, or if i have to deal with the matter myself at my cost.
(I am paying the electrician £000's to rewire my whole house and he has tried to get away with shortcuts all along .. so i'd like to know where i stand on this from a building regs standpoint).

 

[Mister Banks]

You need something like this…….

Manrose Flap Vent White 125 x 125mm

Order online at Screwfix.com. HIPS polystyrene. Suitable for commercial and domestic use. FREE next day delivery available, free collection in 5 minutes.

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[JohnD]

I greatly prefer the cowl vent.

The type with a row of little flaps rattle annoyingly in the wind, until they fall off in a storm.

Better fans also have a very light butterfly flap to block wind.

Please post photos of yours, inside and out.

Cowl Vents | Ventilation | Screwfix

Buy Cowl Vents at Screwfix.com. A hooded vent. Prevents drafts. Suitable for flat or round ducting. Click and collect in hundreds of stores nationwide.

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The cowl throws off rain and gives some wind protection. It has a single large flap.

I hopd your installer fitted a plastic duct in the wall.

 

[renol]

is there anything within building regs that state a fan should have a backdraft prevention mechanism of some sort? (Plastic duct i believe). Pictures attached of current vent, ducting i believe has been used, current external vent cover. Im not looking for solutions at this stage, just whether the electrician is obliged to put it right or if he has done all he needs to do to comply with building regs.

 

[JohnD]

There is not a backdraught regulation.

I can't tell the make and model of your fan, so I don't know how good it is.

Does the duct just go straight through the wall? Or run in the loft or something?

 

[renol]

ahh darn. with all the regs on insulation and ventilation - seems a bit crazy that an electrician can basically core out a whacking great big hole in my wall and that's ok. The duct just goes straight through the wall.

 

[renol]

looks like the make is deta - i couldnt spot a model. (The electrician destroyed my newly plastered wall, installing it .. what a nightmare)