335 Folding Door

The 335 Folding Door (formally Centor C1) is Centor’s most affordable thermally-improved aluminium folding door, with robust, square-cut corner construction. Available in both inward and outward opening configurations, the 335 is a bottom-rolling system, perfect for use in a renovation or conservatory where a structural beam is not required. 

Like all Centor doors, the 335 Folding is engineered to last a lifetime – featuring our superior paint process along with smooth, fingertip operation.

  • Aluminium in a range of RAL colours.
  • Bottom-rolling carriers feature self-cleaning wheels.
  • Tamper-proof hinge flaps are fixed in the edge of the stile.
  • Choice of sills available, including compact, easy access, low outward, low inward and flat.
  • Intermediate panels are secured in one easy movement with the Centor Twinpoint lock.
  • Double or triple glazing available.
Max frame width
Max frame height
Max panel width
inward or outward

* Max. panel width of 1200mm applies to double glazed doors only. Max. panel width for triple glazed doors is 1000mm.

Folding Door diagram

Easy locking

The Centor Twinpoint lock is simple to use, with an elegant central handle operating concealed top and bottom bolts to secure panels in one easy movement – no bending or reaching to unlatch tricky bolts. Our Twinpoint lock is available keyed or non-keyed, depending on your preference.

Centor 335 simple to use Twinpoint lock
Smooth operation

The doors will operate smoothly for years to come, thanks to Centor-grade engineering. The bottom-rolling carriers glide in a flat track on low-friction, self-cleaning wheels.

Centor 335 carrier
Keep doors working like new

Should a property settle over time, panels can be adjusted both vertically and laterally, so the doors continue to glide smoothly with fingertip operation.

Centor 335 (Centor C1) adjustment
Weather tests

The following performance levels were achieved when tested in accordance with BS 6375 - 1:2009.

Air permeability
Class 2
Water tightness
Class 7A
Resistance to wind load
Class A3

The following thermal performance results were achieved in third party testing:

Double glazed: U = 1.7w/m2k
Triple glazed: U = 1.3w/m2


Architectural details

CAD cross sections (pdf, dwg, dxf)
Profile drawings (pdf)
Glazing details (pdf, dwg, dxf)


335 brochure
335 configurations
Centor door finishes – aluminium

CE Certificates

335 Folding Door, double glazed, DP-06-004-2018
335 Folding Door, triple glazed, DP-05-004-2018