ReynaersBifold Doors

ConceptFolding 77

Premium folding doors for wide openings and seamless indoor-outdoor transitions.

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Reynaers ConceptFolding 77

Technical Specifications

Frame Depth

3-1/16" (77 mm)

U-Factor (best)

0.26 Btu/hr-ft2-F (triple, functional)

Max Panel Height

9' 10" (118-1/8")

Max Panel Width

3' 11" (47-1/4")

Max Frame Height

10' 0" (120")

Glazing Thickness

1/4" to 2-1/2"

Opening Direction

Inward or outward

Acoustic Rating

STC 45 / OITC 38

AAMA Rating

NAFS SP PG55

Threshold Options

High Performance, Double Weather Seal, Low, Flat Bottom

Overview

What makes the ConceptFolding 77
stand out.

Reynaers ConceptFolding 77 is the higher-performance successor to the CF 68, built for larger openings and better thermal insulation. The 77 mm (3-1/16") profile depth accommodates glazing from 1/4" to 2-1/2" thick, with panels reaching 47-1/4" wide and 118-1/8" tall - and overall frame heights up to 120". Both inward and outward opening configurations are supported, with an optional first-leaf entrance door that operates independently without affecting the folding capacity. Available in standard and Slim-Line (CF 77-SL) frame variants, and four threshold options: High Performance, Double Weather Seal, Low Threshold (3/4" rise), and Flat Bottom for barrier-free access.

Key Highlights

Two frame variants: standard Functional and Slim-Line (CF 77-SL) with narrower sightlines
First leaf can function as a standalone entrance door without affecting folding operation
Four threshold solutions from high-performance weathersealing to flush barrier-free
Fiberglass-reinforced polyamide thermal breaks for strong insulation across the profile
NAFS tested at SP PG55 rating - proven air, water, and structural performance

✓

Ideal For

Custom homes and high-end renovations where large folding openings need to meet serious thermal and weather performance targets. Ideal for living room-to-patio transitions, pool houses, covered terraces, and commercial hospitality spaces that demand both aesthetics and tested performance.

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Consider an Alternative When

If you need a tighter budget and the opening is moderate in size, the ConceptFolding 68 offers a slimmer 68 mm profile at a lower price point. If you want a sliding mechanism instead of folding, the Reynaers Hi-Finity delivers ultra-minimal sightlines with wider individual panels.

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