36" Driftwood Gas Log Set | Formation Creation

Brick or stone fireplace built into the wall. Openings are rarely perfectly square — always use the smallest number.

Pro Tip: For Inside Fit, round down to the nearest 1/16″. For Overlap Fit, 1/8″ tolerance is fine — the frame covers any small variance.

Lintel Bar Rule: If the lintel bar is recessed more than 1″ into the opening, measure to the brick above it. If it sits within 1″ of the face, measure to the lintel bar.

Inside Fit works best when square. Overlap Fit is more forgiving — the frame covers the edge. Either way, measure to the nearest 1/8″ — we build to your exact dimensions.

Factory-built sealed steel firebox (Heatilator, Majestic, Superior, Lennox, Heat & Glo, Astria…). Sides are even all around — one width, one height. Model match matters more than fractions.

Have visible louvers around the opening? Our Brookfield ZC Deluxe ships with an extended frame designed to cover factory louver trim — no demo, no patch work. Mention louvers in the notes and we'll confirm coverage from your photo.

Never measure inside the firebox — that's the refractory liner, not the door opening. Stick to the front-face steel rim.

Surround clearance: Prefab doors need 1/2″–1″ of flat surface around the opening for the magnetic frame. Note any tile lip, drywall return, or trim that limits the mounting area.

Curved-top opening (true arch, cathedral, or eyebrow). Three numbers required: Width, Side Height (where the curve starts), and Peak Height (rise to the highest point).

United Inches (UI): Arch pricing uses Width + Peak Height. Knowing both gives you the exact tier.

Free Template Kit: For arches we ship a paper template kit at no charge — you trace the curve and mail it back. Most accurate way to capture eyebrow or asymmetric arches. Add it after checkout or call us.

Asymmetric arches (one side higher than the other) are common in older homes and reproduction builds. Order the Free Template Kit — we cannot guarantee fit from measurements alone.