Large-Opening Doors

Air Master Multi-Folding (Bi-Fold) Door

Sliding, multi-fold, and pivot doors for wide-opening indoor-outdoor connections.

Bi-fold panels that fold together and stack to one side, opening the full width of the host wall for indoor-outdoor transitions.

01 multi folding door air master windows and doors

Built for South Florida homes

The Multi-Folding door is Air Master's bi-fold, panels that fold together and stack to one side to open the full width of a wall. It is the disappearing-wall opening for a patio, lanai, or great room, built on aluminum frames sized for those wide spans. As a folding system it gives more open width than a slider of the same opening, since the panels stack rather than overlap.

In Air Master's catalog this is an architectural door rather than a certified impact product, so its Florida use is confirmed per opening and jurisdiction; it is not HVHZ-rated on its own. For a code-compliant large opening that must carry impact glazing, the High Performance Sliding Door is the certified Air Master choice; the Multi-Folding door is the full-width folding option where the project's code path allows it.

  • Aluminum frame engineered for strength and durability
  • Corrosion-resistant finishes for coastal applications
  • Professionally installed across South Florida by Armor Pro
Engineered Strength
Built and tested to Florida product-approval standards
Corrosion Resistant
Coastal-grade finishes for salt-air durability
Limited Warranty
Manufacturer warranty plus Armor Pro install workmanship

Related Products

More models in the Large-Opening Doors.

Air Master Pivot Door
Air Master Pivot Door
Pivot Door
See price & specs
Air Master High Performance Sliding Door (HP / HP Air)
Sliding Glass Door
See price & specs
Air Master Regular Sliding Door (Model 4000)
Sliding Glass Door
See price & specs

Comparable from Other Brands

Other bi fold door models Armor Pro installs.

Eco-Guard Bi-Fold Door Series 900
ECO Window Systems
Eco-Guard Bi-Fold Door Series 900
See price & specs
Pella Bifold Patio Doors
Pella
Pella Bifold Patio Doors
See price & specs
WinDoor BF1199A Bi-Fold Door
WinDoor
WinDoor BF1199A Bi-Fold Door
See price & specs
ES Windows Prestige ES-BF5010T Bi-fold Door (TB)
ES Windows
ES Windows Prestige ES-BF5010T Bi-fold Door (TB)
See price & specs
From the blog

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Frequently Asked Questions

The Multi-Folding door is Air Master's bi-fold, with aluminum panels that fold together and stack to one side to open the full width of a wall. It's the disappearing-wall option for a patio, lanai, or great room, built on aluminum frames sized for those wide spans. We install it where you want to open up an entire opening for indoor-outdoor living.

Yes, for the same opening width a folding system gives you more clear open width than a slider, because the panels fold and stack to the side rather than overlapping each other. That makes the Multi-Folding door a strong choice when you want the wall to truly disappear. We can compare it against the HP Sliding Door for your specific opening at quote.

No. In Air Master's catalog the Multi-Folding door is an architectural door rather than a certified impact product, and it is not HVHZ-rated on its own, so its Florida use is confirmed per opening and jurisdiction. If your opening must carry impact glazing to clear code, the High Performance (HP) Sliding Door is Air Master's certified impact choice (Florida Product Approval FL #20662), and we'll point you there when the code path requires it.

Because the Multi-Folding door is an architectural product rather than a certified impact door, its Florida use is confirmed per opening and jurisdiction rather than carrying a blanket approval. Armor Pro reviews your project's code path and confirms where it can be permitted before we proceed. Where the opening has to carry impact certification on the door itself, we'd recommend the HP Sliding Door instead.

The Multi-Folding door is built on aluminum frames sized for patio, lanai, and great-room openings, which suits South Florida's salt-air climate and the wide spans these doors are used for. The aluminum folding system lets the panels stack cleanly to one side. We'll confirm the panel count and sizing when we measure your opening for a free estimate.

We don't quote a flat price because installed cost depends on the width of the opening, the number of folding panels, and the condition of the existing opening. As a wide-span architectural door, the size and panel configuration drive the price more than a standard door does. Armor Pro provides a free, no-obligation estimate after measuring your opening so the number reflects your actual project.

The High Performance Sliding Door (HP / HP Air, FL #20662) is the line's Florida-approved impact slider and Air Master's newest certification, qualified through the more rigorous Product Evaluation Report track rather than a summary certificate. It's the door we reach for when a wide patio or great-room opening has to carry code-compliant impact glazing. The Regular Sliding (Model 4000), Multi-Folding bi-fold, and Pivot are architectural openings without their own Florida impact certification, so their use is confirmed per opening and jurisdiction.

The HP Sliding Door holds statewide Florida Product Approval but not a Miami-Dade NOA, so it is not certified for the HVHZ that covers Miami-Dade and Broward. In those counties we'd specify an HVHZ-approved sliding or folding system from our catalog instead. Outside the HVHZ, the HP Sliding is the certified Air Master choice for a large opening. We confirm what your jurisdiction requires before we quote and permit.

Yes, but only on specific products. Air Master's Series 250 aluminum line — fixed window, horizontal-slider window, sliding glass door, and swinging door — carries a Miami-Dade Notice of Acceptance (NOA) and is rated for the High-Velocity Hurricane Zone that covers Miami-Dade and Broward counties. The rest of the residential catalog carries statewide Florida Product Approval, which is accepted across most of Florida but not inside the HVHZ. We confirm the right product for your county before we quote.

Explore more: All Bi Fold Doors we install · Window and Door Designer and Visualizer

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