VETUS ALTUS Escape Hatch - OD 23-1/16" x 23-1/16" [ALT5151SL]ALTUS Escape Hatch OD 23 1 16" x 23 1 16" ALTUS is made of a sturdy aluminum profile (height 13 16 (21 mm)) with a satin sheen anodized frame and is suitable for design category A and appliance location area II. The acrylic has a thickness of 3 8 (10 mm) and is dark smoke colored. These hatches come with adjusters which are stylish and easy to operate, allowing the lid to be held open at almost any angle up to 90. Type ALTUS can be fitted on the deck