Browser not supported

You are using an old browser that we do not support anymore. Please consider using a modern web browser such as Microsoft Edge, Google Chrome or Firefox for the best website experience.

ACO Therm light shaft 600 depth

Optimisations to increase comfort in the ACO Therm® light shaft

ACO Therm® cellar light shafts have always been convincing, not only because of their maximum light incidence in cellar rooms, dimensional stability and long service life. The light shafts from ACO can also be walked on, driven over, installed directly on the cellar wall, on perimeter insulation or pressure-tight.

In addition to these advantages, the new 600 series cellar light shaft now presents itself with new functional and economic features, from optimised component geometry to height adjustability.

Optimised component geometry

The reinforcing rib running into the side area, as well as the so-called drainage chimney, provide additional stability in the light well body.


  • Additional stability against earth and water pressure

Height adjustment

The light shaft flange has been equipped with a locking and sliding area. A so-called locking block engages in the upper locking area, which provides the necessary load transfer. By turning it 90 degrees, the locking block is moved into the shifting position so that the complete light shaft can be shifted up and down via the 28 cm oblong hole. The lower shifting area with the engaging guide block provides lateral stability and enables fine height adjustment again without having to loosen the fastening screws.


  • Fine height adjustment in 2 cm steps
  • Height adjustment is made exclusively via the two upper fastening points
  • Displacement range of 28 cm
  • When installing on perimeter insulation, only the two upper fixing points need to be fixed in the basement wall. The two lower guide blocks are fixed directly in the perimeter insulation by means of spiral dowels.

Light shaft bottom

The bottom of the light shaft has a three-sided slope towards the drainage opening.


  • Keeps water away from the basement wall
  • No soaked plaster
  • avoidance of moisture damage
  • better self-cleaning

Drainage opening

The drainage opening is located 152 mm from the wall.


  • The drainage connection is not in the insulation up to an insulation thickness of 140 mm.
  • on-site recessing of the insulation for the drainage connection is not necessary for insulation up to 140 mm, thus:
  • no thermal bridge
  • Time saving of approx. 15 minutes
  • Backwater unit in drainage connection accessible for maintenance

Incorporating perimeter insulation

The side walls and the light well floor are provided with a relatively straight surface on the wall side.


  • Perimeter insulation no longer has to be adapted so extensively to the light well contour during DWD installation on the basement wall, resulting in time savings

Retractable rear wall

The light shaft's body is equipped with a groove on the wall side to accommodate a rear wall.


  • when installed directly on the basement wall and on perimeter insulation, the time-consuming plastering in the light shaft can be dispensed with
  • Time saving due to omission of plastering work

The ACO cellar protection system - watertight cellar planning

Watertight basement windows* - for more security

Your window is not watertight? You want to replace your basement window or install a new basement window? The ACO Therm® basement window is available in various designs - with flood protection and/or burglary protection.

Thermal insulation - for comfort in the cellar

Thermal insulation of the outer cellar wall can be sensibly achieved with the ACO Therm® Block - so that the cellar is not only bright and dry, but also warm and homely.

Light shaft - watertight and floodproof

The cellar can only be used optimally with a cellar light shaft. ACO light shafts in various versions provide sufficient light. They can be mounted on the insulation to be water pressure-tight and free of thermal bridges.

ACO backflow stop - to keep the sewage out

When the sewage system is overloaded, the water presses into the cellar. A backwater protection system ensures that this does not happen and that the cellar remains dry.