The extensions are made with kits of 300 mm aluminium panels. These panels are stackable and can reach 600 and 900 mm.
BR 10-14 with two rows of aluminium panels
300 mm inclined front grid
600 mm inclined front grid
600 mm front post
900 mm middle post and stiffening bar
Waterproof door and 300 mm extensions
Waterproof door and 600 mm extensions