Hardly every hearth is a generous opening. Most, in older homes were built modest — a bedroom fireplace running a fraction than a living room opening. Compact units exist precisely for these openings. The 36 size falls near the size many older fireboxes take: a real heat source while never being too big for a modest room.As your provider of compact inserts, we keep every project simple and rewarding. This guide covers what to know.Sizing for a Small HearthCompact units have one non-negotiable requirement: the unit has to go in. Take all four dimensions before choosing units — fireboxes narrow inward, which surprises a lot of people. A 36 gas fireplace insert fits a great many older openings.Unsure how to measure? Our experts make it easy to match a unit to your opening. propane fireplace inserts Find a Compact InsertReady to find a 36 gas fireplace insert? Whether you need natural gas or propane, a good selection guide you find the perfect fit. gas fireplace insert modern Reach out to our team today to start sizing your insert.