Overview

The Perko 0339DP0CHR is a chrome-plated brass clam shell ventilator with a 4" x 3-3/4" base, a 2-1/2" wide opening, a 1-5/8" opening height, and #6 screw mounting. It is a straightforward exterior vent cover for boats that need airflow at enclosed spaces without leaving the opening fully exposed.

This size works well in places where a low-profile vent cover makes sense, including cabin sides, wheel houses, and engine-space ventilation points. The chrome-plated brass finish gives it a traditional hardware look that suits many classic and modern boats, especially where other exterior fittings are already finished in chrome.

Key features

• Chrome-plated brass construction with a polished exterior look for visible mounting areas
• Base size of 4" x 3-3/4" for planning the mounting footprint on cabin sides, coamings, or other exterior panels
• Opening size of 2-1/2" wide by 1-5/8" high for airflow at enclosed onboard spaces
• Uses #6 fasteners, which helps when matching existing mounting hardware or replacing an older vent cover
• Clam shell form that keeps the vent opening hooded while still allowing ventilation

Compatibility and fit

This ventilator is best matched to boat layouts that need a surface-mounted exterior cover rather than a hose-connected vent fitting. Before ordering, check the mounting area for the full 4" x 3-3/4" footprint and confirm that the vent opening location suits the 2-1/2" x 1-5/8" passage behind the cover.

It is a practical replacement when you are matching an existing Perko clam shell vent of the same size or refreshing older chrome hardware on a cabin side, wheel house, or similar enclosed section of the boat.

Installation and setup

Installation is simple, but fit matters. The surface should be fair and properly sealed, and the mounting orientation should suit the airflow path and exposure at that part of the hull or superstructure. Because it uses #6 screws, it is worth confirming the hole pattern on a replacement job before drilling new holes.

This vent is a good match for boat owners and yards working on refits, hardware replacement, or new installations where a compact clam shell cover is preferred over a larger ventilator assembly.