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Instead of a bifold door, you might look into installing French doors, pocket doors, or sliding doors. Each has its own pros and cons. French doors offer the dual-door advantages that bifold doors do, and pocket doors are excellent space savers—though you’ll need to create a wall cavity to have them installed. 

Interior and exterior door openings are typically 80 inches high, with openings 29¼ inches wide for interior doors and 35 inches wide for exterior doors. If your couch is smaller than these measurements, it should fit through the door frame.

Yes, prehung doors include a door jamb. Prehung doors are sold as a single piece with the door frame already constructed, including the hinges. The only part missing is the trim, which you add after fastening the door. They are more expensive than slab doors but are quicker and easier to install. Prehung doors come in an array of sizes, so there’s likely an option to fit any doorway you need.

Start by checking the top or side edge of the door. Look for a certification label or metal tag stamped with details like the fire rating and information on the manufacturer. Even if it’s painted over, the tag should still be visible. Next, look along the edges for slim intumescent strips. They’re designed to swell up and seal gaps when exposed to heat. Finally, check if the door closes itself. Most fire doors have a self-closing mechanism, like an overhead closer or spring hinges. If none of these are obvious, contact a fire safety professional to help verify your door.