Perko 4 x 3-3/4 in Chrome Brass Clam Shell Ventilator

The Perko clam shell ventilator is a compact chrome-plated brass fitting for covering and directing airflow through a deck or cabin opening. Its curved shell shape helps shield the opening from direct spray while maintaining a clear path for passive ventilation. Chrome-plated brass construction gives the fitting a traditional bright marine finish with the durability of a metal body.

The base measures approximately 4 in x 3-3/4 in, making the vent easy to compare against an existing mounting footprint. The airflow opening is approximately 2-1/2 in wide by 1-5/8 in high. Perko specifies #6 mounting screws, allowing installers to plan fasteners and backing before placing the fitting.

• Clam-shell shape helps shield the vent opening from spray
• Bright-finish metal construction provides long-term durability
• Compact footprint suits cabin and deck ventilation points
• Specified for installation with #6 screws

This ventilator is useful for replacing an existing shell vent or adding a protected passive-air opening. Check the base footprint and opening location before drilling new mounting holes. Browse more Mounting & Rigging Hardware for related products and compatible alternatives.