Clay Air Bricks & Periscope Vents

[BadgerBadger]

We're planning to use clay air bricks for our subfloor periscope vents instead of plastic ones.  I bought Manthorpe G960 periscopes as they advertised they could be used with clay bricks, sure enough the clay ones fit snugly at the front.

 

However, we have a brick plinth detail so the vent needs to pass through a 215mm outer leaf.  I bought some Manthorpe G935 extender sleeves, which would do the trick except the clay air bricks don't fit.

 

Is it just a matter of trimming the sleeve to length and then butting up directly against the clay brick? Or any other trick?

[nod]

2 hours ago, BadgerBadger said:

We're planning to use clay air bricks for our subfloor periscope vents instead of plastic ones.  I bought Manthorpe G960 periscopes as they advertised they could be used with clay bricks, sure enough the clay ones fit snugly at the front.

 

However, we have a brick plinth detail so the vent needs to pass through a 215mm outer leaf.  I bought some Manthorpe G935 extender sleeves, which would do the trick except the clay air bricks don't fit.

 

Is it just a matter of trimming the sleeve to length and then butting up directly against the clay brick? Or any other trick?

I just cut a horizontal extension in half and fixed it together with two screws 

If your laying the engineering bricks yourself 

a good trick is to lay the engineering bricks ignoring the vent brick Then take a brick out later and replace with the clay vent brick 

Otherwise the holes fill up at the back 

Edited July 3, 2022 by nod

[Canski]

Can you not extend the Lowe part rather than the upper? Take the  bottom vent out and add the extender then bring the periscope up behind the outer skin of brickwork ?