Should retrofited air bricks bridge cavity wall or not?

[spencerpj]

Hi, I have a 1970s house which only has 3 air bricks on one side of the house, so I would like to retrofit more to improve subfloor ventilation.

The company that has quoted has advised that they just need to replace bricks in the outer skin with air bricks and that this will ventilate the cavity and the subfloor. Before I continue I would like advice as to if this is sufficient as have read on other posts that the air brick should bridge the cavity to vent the subfloor sufficiently?

Thank you

 

[stuart45]

They should have liners so the air goes straight into the sub floor.

 

[jj4091]

You could fit these

BES.co.uk | Next Day Delivery On 15,000 + Plumbing Supplies

Ventilator / Two Brick Ventilator - Order Gas and Plumbing Supplies online at BES.co.uk. Low Prices, Free Next Day Delivery Available, 15k Plus Products in stock P/N: 12523

www.bes.co.uk