Pleasant Hearth Fireplace Door Sizing Guide
Getting the right size is the most important step when buying a fireplace door. This guide walks you through measuring your opening correctly, understanding Pleasant Hearth's adjustable bracket system, and avoiding the most common sizing mistakes. Once you have your measurements, browse our fireplace door collection to find the right model.
Step 1 — Confirm You Have a Masonry Fireplace
Pleasant Hearth glass fireplace doors are designed for masonry fireplaces — openings surrounded by brick, stone, or concrete. Before measuring, confirm your fireplace type:
Masonry Fireplace (Compatible)
- • Brick or stone surround
- • Part of your home's original construction
- • Heavy concrete or mortar hearth
- • Metal lintel bar visible at top of opening
Prefab Fireplace (Not Compatible)
- • Sheet metal interior walls
- • Brand name stamped inside the firebox
- • Lightweight, hollow-sounding surround
- • Installed in newer construction (post-1980s)
Step 2 — How to Measure Your Fireplace Opening
Use a metal tape measure. Measure in inches. Fireplaces are rarely perfectly square, so take multiple measurements and always use the smallest dimension for each.
- 1Measure the width. Measure horizontally across the opening at three heights — just below the top, at the middle, and just above the bottom. Record all three. Your sizing width is the smallest of the three.
- 2Measure the height. Measure vertically from the top of the opening down to the hearth on both the left and right sides. Use the smaller of the two measurements as your sizing height.
- 3Record the opening dimensions. Write down your width and height measurements. These are your “clear opening” dimensions — the actual hole in the wall, not the decorative surround.
- 4Find a door that fits your range. Each Pleasant Hearth door lists a minimum and maximum opening width and height it can accommodate via its adjustable brackets. Your measurements must fall within both the width and height ranges.
Pleasant Hearth Door Size Ranges
Pleasant Hearth offers fireplace doors in small, medium, large, and extra-large categories. Most models accommodate a range of opening sizes through their adjustable overlap bracket system — typically covering a 4–6 inch range in both width and height.
| Size Category | Typical Opening Width | Typical Opening Height |
|---|---|---|
| Small | 28" – 32" | 23" – 27" |
| Medium | 32" – 36" | 25" – 29" |
| Large | 36" – 40" | 27" – 32" |
| Extra Large | 40" – 48" | 30" – 36" |
Always verify against the specific model's spec sheet, as ranges vary by product.
How Adjustable Brackets Work
Pleasant Hearth doors don't mount inside the opening — they mount to the face of the brick surround using overlap brackets. The door frame is slightly larger than the opening it covers, and the brackets slide along the frame to adjust how much overlap is created on each side.
This means a single door model can fit a range of opening widths. When the brackets are fully extended, the frame covers the maximum opening size. When pulled in, it covers a smaller opening. The fiberglass gasket strips seal the gap between the frame and the brick face.
Common Sizing Mistakes to Avoid
- ✗Measuring the surround instead of the opening. The surround is the decorative brick or stone face around the fireplace. Always measure the actual hole — the firebox opening — not the decorative surround.
- ✗Using the largest measurement. Fireplaces taper slightly. Always use the smallest width and smallest height measurement to ensure the door will fit without forcing.
- ✗Forgetting to check the hearth depth. Some door frames extend slightly into the firebox. Measure how far your hearth extends to ensure it won't block the door from swinging open.
- ✗Assuming all fireplaces are standard. Older homes often have non-standard openings. Don't assume your fireplace is a standard size — always measure before ordering.