Depending on the length of the run and the orientation (for sloped roofs) as well as the geographical location of the job, it is estimated that a TCR commercial sun tunnel can bring adequate lighting to 150 – 400 square feet.

Yes. VELUX manufactures and sells VELUX sun tunnels, which are available with rigid or flexible shaft options. Sun tunnels for commercial applications are also available.

On the inside, the TCR commercial sun tunnel is designed to fit in standard 2’ x 2’ ceiling tile. The adapter box can also be retrofitted into a hard sheet rock ceiling if necessary. The diffuser is square in shape and prismatic for optimal light diffusion.

The  TCR commercial sun tunnel  is composed of a curb-cap style flashing to better accommodate the preferred flashing method on commercial roofs. The commercial sun tunnel is simply installed on top of a pressure treated site-built (8” minimum) curb just like any other curb mounted skylight.

For optimal light transfer between the outdoors and the interior space, VELUX recommends 20 feet maximum between the roofline and the ceiling grid. There is no reason other than optimal lighting output that the TCR commercial sun tunnel cannot be installed in applications of 20 feet or more.

A “run” is the distance between the ceiling and the roofline. VELUX makes recommendations in the Commercial Skylight Catalog (V-USA-1824) as to which components should be used for which runs. These recommendations account for the run as well as the height of the curb and flashing overlap with collar.

The TCR commercial sun tunnel is the most economical way of bringing natural light into a commercial space. It is a 22” diameter tubular skylight with rigid and highly reflective tunnel designed to provide the maximum amount of daylight in commercial spaces.

The TCR commercial sun tunnel is primarily designed for low-sloped and flat roof applications with a suspended ceiling or hard ceiling in the interior space.

The TCR commercial sun tunnel was designed with a basic 8’ run in mind. An 8’ run requires a roofing component (P1), a ceiling component (P2) and a telescopic tunnel (P3). For example, the TCR sun tunnel with components for an 8’ run will retail for $495.

However, the TCR sun tunnel was designed to be completely modular. The roofing component and the ceiling component should always be “standard” as they are needed on all jobs. The modularity comes from the almost unlimited combinations of extension pieces such as the 5’ telescopic tunnel or the 24” coupler piece.

All applications from 3' runs to 20' + can be accommodated simply by combining several of the telescopic components or using the 24” coupler. For very short runs, only the roofing component and the ceiling component may be needed. For runs up to 8 feet (from roofline to ceiling tile), a telescopic tunnel is required in addition to the roofing and ceiling components. For longer runs, a combination of telescopic tunnels and couplers may be required.

For details on what parts are needed for various run lengths, please contact us.

The TCR commercial sun tunnel is composed of three “standard” elements:

• Roofing components (P1): Dome, flashing and top elbow
• Ceiling components (P2): Adapter box (round to square transition that fits into a 2x2 ceiling tile), diffuser frame and prismatic diffuser, flexible bottom elbow
• Telescopic rigid tunnel (P3): can be extended to 5 feet

In addition, VELUX provides an option for a 24” coupler piece for added flexibility in the length of the tunnel run.