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Fox Blocks forms have a reversible inter­lock sys­tem on all blocks. The robust inter­lock allows the blocks to fit togeth­er very tight­ly, elim­i­nat­ing any require­ment for adhe­sives. A reversible inter­lock speeds up the instal­la­tion.

Yes, if the fol­low­ing cri­te­ria is avail­able for the design of a con­crete lin­tel (beam) over the open­ing – con­crete lin­tel depth min­i­mum 16″ (400 mm) or more with no point loads. Larg­er open­ings would require an engi­neered design.