Lewmar Standard Size 1 Opening Portlight, Smoke

The Lewmar Standard Size 1 opening portlight is one of those parts you install once and stop thinking about. It's a clean, rectangular opening port built for the deck, coach roof, cockpit, or transom, and it brings light and fresh air into a cabin or berth without the bulk of a hatch. The smoke-gray acrylic lens cuts glare and keeps the interior cooler on a sunny day at anchor, while still letting plenty of daylight through.

This is the Size 1 in Lewmar's Standard rectangular range. It drops into a cut-out measuring 13-11/16 inches wide by 6-3/4 inches high, with an overall frame footprint of 14-7/16 inches wide by 7-1/2 inches high. The frame stands just 5/32 inch proud of the surface, so it sits nearly flush and won't snag a jib sheet or a dock line. If you're replacing an older Lewmar Standard port of the same size, measure your existing cut-out first. The Standard range shares cut-out dimensions across its versions, but corner radius can vary, so confirm the opening before you cut anything.

The frame is aluminum with a silver finish, so it holds up to salt and UV far better than a plain plastic port. It opens on a hinge and dogs down with a clip handle that pulls the lens tight against the seal. Close it up before you get underway and it keeps spray and weather out. Crack it open at anchor and you get real airflow through the cabin, which matters on a warm night when you want to sleep without running a fan.

Lewmar ships this one complete. You get the portlight itself, a flyscreen to keep bugs out when the port is open, a white ABS plastic interior trim ring that finishes the inside of the cut-out cleanly, and twelve M5 x 25 mounting screws. That's everything you need to mount it in a standard-thickness deck or cabin side. The white trim gives you a tidy interior look against most headliners and bulkheads.

Who's this for? Owners of cruising sailboats, trawlers, and center-console cuddy cabins who need to replace a cracked or hazed port, or anyone building out a cabin who wants a factory-grade opening port instead of a fixed window. The smoke lens is the right call if your berth faces the sun for a good part of the day. It knocks down heat and glare so the cabin stays comfortable, and it hides the clutter of a bunk from anyone looking in from the dock.

A few honest notes. This is an opening portlight, not a hatch, so it's sized for ventilation and a view, not for climbing through. The acrylic lens is tough, but like any acrylic it'll craze over years of hard UV, which is why Lewmar sells replacement lenses and hinge kits for this size separately. Treat the lens with a plastic-safe cleaner, not an ammonia glass cleaner, and it'll stay clear for a long time. And give the seal a wipe and a light silicone treatment once a season so it keeps dogging down tight against the frame.

Installation is straightforward for anyone comfortable with a caulk gun. Dry-fit the port, mark and drill the twelve fastener holes, bed the frame in a quality marine sealant, run the M5 screws, and fit the interior trim ring. Snug the fasteners evenly so you don't distort the frame, and let the sealant cure before you dog it closed. Take your time with the bedding compound, because a port that's sealed right the first time is a port you never have to chase a leak on. It's an afternoon job on most boats.

Lewmar's been building hardware, hatches, and portlights since 1946, and this Standard range is their everyday opening port, the one you see on thousands of production boats. It's a simple, proven design. Not fancy, just well made and easy to live with. Buy it once, bed it properly, and it'll be letting light and air into your cabin for a lot of seasons.