Lewmar portlights are marine-grade opening windows that deliver watertight sealing, UV resistance, and cabin ventilation, available at MAURIPRO in two main styles: the traditional raised-profile Standard/Atlantic series and the sleek, near-flush Flush Mitre series. Choosing between them comes down to your vessel's aesthetic, installation location, and how much weather exposure the opening will face.
Lewmar portlights at a glance
| Feature | Standard / Atlantic Series | Flush Mitre Series |
|---|---|---|
| Profile | Traditional raised frame, sits proud of cabin | Sleek, sits nearly flush with hull/cabin |
| Best for | Offshore cruising, exposed locations | Racing yachts, modern cruisers |
| Water shedding | Raised profile naturally sheds water | Requires precise cutout and sealing |
| Sizes available | Size 0 up to Size 60 | Size 0 through Size 5 |
| Opening | Opening sash with secure latches | Opening and fixed variants |
What are Lewmar portlights?
Lewmar portlights are precision-manufactured marine glazing units built from marine-grade materials with advanced sealing systems. Each unit combines a robust frame, an opening sash (on opening models), a rubber gasket system for watertight integrity, and all necessary mounting hardware. They are engineered to withstand harsh marine environments while admitting natural light and providing controllable ventilation below deck.
How do Standard and Flush Mitre portlights differ?
Standard (Atlantic) portlights feature a traditional raised profile that provides excellent water drainage and structural strength, making them the reliable choice for offshore sailing and exposed installations. Their raised frame naturally sheds water away from the sealing surfaces. Flush Mitre portlights, by contrast, sit nearly flush with the boat's hull or cabin structure, minimizing wind resistance and delivering a modern, low-profile aesthetic preferred on racing yachts and contemporary cruisers. Flush Mitre units require more precise cutouts and careful installation.
How do I choose the right size?
Lewmar portlight sizes are defined by the cut-out (the hole needed in your cabin wall), not the overall dimensions. Measure your existing opening carefully before ordering. MAURIPRO stocks sizes from the compact Size 0 (15.6 x 30.3 cm cut-out) up to the large Size 60. Smaller units such as Size 0 and Size 1 suit forward cabins and heads, while larger sizes admit maximum light for main salons and aft cabins. Allow 2–3 cm beyond the cut-out on all sides for interior trim, and verify your cabin wall thickness accommodates the frame depth.
Which frame material and finish should I choose?
Price differences within the same size usually reflect frame material and finish. Premium anodized aluminum or stainless steel frames offer superior corrosion resistance, better thermal performance, and reduced condensation — worth the upgrade for portlights facing prevailing weather. Standard aluminum frames deliver excellent durability at more accessible pricing and perform well in protected installations. Match finishes across your vessel for visual consistency, and favor premium frames for the most exposed openings.
Frequently asked questions
What is the difference between Lewmar Atlantic and Flush Mitre portlights?
Atlantic portlights have a traditional raised frame that sits proud of the cabin surface for easy installation and excellent water shedding. Flush Mitre portlights sit nearly flush with the cabin side for a sleek, aerodynamic look but require more precise cutouts.
How do I determine the correct Lewmar portlight size?
Measure the cut-out dimensions of your existing opening, since Lewmar sizes are based on the hole needed in your cabin wall rather than the overall unit. MAURIPRO carries sizes from Size 0 (15.6 x 30.3 cm cut-out) up to Size 60.
Can Lewmar portlights be opened for ventilation?
Yes, most Lewmar portlights are opening models with secure latching systems that let you control airflow while maintaining weather protection. Their robust construction ensures smooth operation even after years of marine exposure.
What is included with a Lewmar portlight?
Each unit ships with the frame, opening sash (on opening models), high-quality rubber gasket seals, and the mounting hardware needed for installation. Installation templates and instructions are provided for proper fitment.
Why do identical Lewmar models sometimes show different prices?
Price variations typically reflect different frame materials, acrylic tints, or seal specifications — for example upgraded frames versus standard aluminum, or tinted versus clear acrylic. Enhanced UV coatings can also affect pricing.