Air Brick sizing - bigger than the flue

[JLT]

Hello there,

We're renovating a Victorian house with a suspended timber floor. We're doing a lot on thermal envelope and air tightness across the house, but aware we need adequate air flow through the suspended timber floor. There's once vent at front and one at rear, the architect spec-ed it as a single brick height air brick at the front, but the air brick installed by the builder is double brick height, with the flue just single height - is there any issue with the mismatch in size? Or will it create a better draw through the flue?

Thanks,
Jo

 

[CountryFan]

What is the flue for?

 

[JLT]

The air brick is above floor level, the flue takes the air under the suspended floor.

 

[CountryFan]

The air brick is above floor level, the flue takes the air under the suspended floor.

So it’s for a fuel burning appliance?

 

[JLT]

No, maybe I'm using the wrong terminology: it's to ventilate a suspended timber floor at ground floor level.

 

[Harry Bloomfield]

The air brick is above floor level, the flue takes the air under the suspended floor.

Then is it a dog-leg vent?

 

[StephenStephen]

Periscope?