Received this from our MVHR installer

[CalvinHobbes]

I explained to him we really didn't want a ventilated cooker hood so he needs to upgrade what he had planned - fair wnough.

"Have u an idea the litres per second that it requires

For a normal kitchen it's 13 l/s min ! again this can go up depending on floor area"

Anyone know? There are relatively few passive or near passive standard houses here. It's a learning curve for many, even very good people.

 

 

[Kelvin]

We have a recirculating hob and a MVHR duct above hob (well just behind) The kitchen extract terminal is set  to 52m³/h (roughly the same as you quote above) The hob venting unit has a min max air flow of 154m³/h to 500m³/h with a max boost of 622m³/h. 

 

Edited April 26 by Kelvin

[JohnMo]

1 hour ago, CalvinHobbes said:

For a normal kitchen it's 13 l/s min ! again this can go up depending on floor area"

Not sure why you think you need anything special.

 

Our was set to 13 l/s with 16 l/S boost with a recirculating cooker hood.  But overall we found we were over ventilating the whole house, so it's now closer to 10 l/s for the whole kitchen diner - No issues a year later and very rarely ever use boost.

 

 

[Conor]

It's 13lps which is easily what any correctly sized MVHR can achieve. We just ran double ducts to the vent.

Edited April 26 by Conor