How many trickle vents?

[georgeca]

Hi all,

I have recently had two bifold doors replaced in my kitchen/dining room, but the installers didn't include the vents on one of the doors. From my understanding, not enough vents goes against building regulations? I'm trying to figure out if the vents on the one door is enough for the room. The room is a large extension at approx 85 square meters, with no airbricks and two trickle vents on the one door.

Any opinions would be very much appreciated!

 

[freddiemercurystwin]

It can depend.

Is the new habitable room built off an existing habitable room?

And if it is, does the existing habitable room have external windows or external doors that have existing trickle vents? If yes, you would need to determine what size they are?

And is there a door or a just an opening between the existing room and the new room?

You also need to know what size the vents in the new bifolds are?

By size of vents I mean their open area, this is measured in mm2, this might be quite difficult to ascertain as trickle vents vary from manufacturer to manufacturer..

 

[georgeca]

Yes it's built of the living room (Which has no windows/external doors). There are no other trickle vents on any doors or windows downstairs. Although actually there are 3 skylights in the same room as the bifolds which have small trickle vents on - So maybe it's fine?

The two trickle vents on the other bifold have written on 'UP TO 4069mm2 FA (or EA?)

Thanks!

 

[RandomGrinch]

I have recently had two bifold doors replaced in my kitchen/dining room, but the installers didn't include the vents on one of the doors. From my understanding, not enough vents goes against building regulations?

Why are you concerned about it?
The recommendations for ventilation rates could be considered a minimum standard by building control; but they are a coverall - depending on many factors, some buildings may need more, or less ventilation.
The only people that care about the exact values are building control, and if your doors were installed by self-certifying FENSA fitters, BC won't be involved.
Missing one trickle vent is unlikely to cause any issues - many posts on here would prefer them not to be fitted in the first place!

 

[georgeca]

Why are you concerned about it?
The recommendations for ventilation rates could be considered a minimum standard by building control; but they are a coverall - depending on many factors, some buildings may need more, or less ventilation.
The only people that care about the exact values are building control, and if your doors were installed by self-certifying FENSA fitters, BC won't be involved.
Missing one trickle vent is unlikely to cause any issues - many posts on here would prefer them not to be fitted in the first place!

I am concerned because I wouldn't want any issues when it comes to selling the house, and from my reading online all windows and doors must be fitted with trickle vents, unless there is an alternative, dedicated ventilation system fitted? The doors they replaced both had vents, and they were meant to include vents on both of the new doors, but they took the measurements slightly wrong and had to remove the vents from one set of doors. My concern is, I accept the installation and pay the final amount, only to have a ventilation issue come up in a survey when selling the house, meaning I would have to then fix the vent issue and pay more money