VELUX TMR 010 - 10″ Rigid Sun Tunnel with Pitched Flashing

The VELUX TMR 010 delivers natural daylight through a 10-inch diameter rigid aluminum tunnel with 99.99% reflectivity, bringing up to 200 square feet of illumination into interior spaces without traditional windows. This pitched flashing model captures light from all angles on sloped roofs, maintaining brightness even through 20-foot tunnel runs — solving the dark hallway problem that plagues many Montana homes.

Light Performance and Coverage Specs

The TMR 010’s 99.99% interior reflective coating sets it apart from flexible alternatives that typically achieve only 95% reflectivity. That 4% difference matters when you’re running a tunnel through 20 feet of attic space.

Specification	Value
Tunnel Reflectivity	99.99%
Lighting Coverage Area	Up to 200 sq ft
Visible Transmittance (VT)	0.45
Maximum Recommended Length	20 to 30 feet (with ZTR extension tubes)
Included Tunnel Length	24-inch extension + two elbows

Contractors value the TMR 010 for its combination of high performance, ease of installation, and longevity. The rigid aluminum construction maintains its shape and reflectivity over decades, unlike flexible tubes that can sag or kink. The 20-year warranty on the rigid silver tunnel backs up the durability claims.

Installation and Roof Compatibility

The Flexi Loc tube connection system eliminates screws, reducing installation time through snap-together assembly. Contractors snap together rigid tube sections using the Flexi Loc system — no wrestling with sheet metal screws in cramped attic spaces.

Installation Specs	Value
Roof Pitch Range	14° to 60° (3:12 to 20:12)
Roof Deck Rough Opening	12.5” x 16” or 14.5” x 16”
Ceiling Opening	10.5” to 11.25”
Compatible Roof Types	Shingle, wood shake, slate, or metal

The DIY-friendly installation suits those comfortable with roof/ceiling work. The included 45-degree adjustable elbow allows directional routing through the attic, navigating around HVAC ducts or structural members without custom fabrication.

Energy Performance Options

Standard installations deliver decent thermal performance, but Montana’s heating-dominated climate demands better. The standard U-factor sits at 0.50, dropping to 0.38 with the ZTC Energy Kit. Solar heat gain coefficient improves from 0.51 to 0.28 with the kit — critical for preventing summer overheating while maintaining winter solar gain.

Energy Performance	Standard	With ZTC Energy Kit
U-Factor	0.50	0.38
SHGC	0.51	0.28
ENERGY STAR Status	Not qualified	Qualified in Northern zones

The pitched flashing specifically captures light from all angles on sloped roofs. This design maximizes morning and evening light capture when the sun sits low on Montana’s horizon.

Material choices include UV-resistant acrylic domes standard, with polycarbonate impact-resistant upgrades available. Montana’s occasional hail makes the impact dome worth considering, especially on south-facing exposures.

Frequently Asked Questions

What rooms work best for the 10-inch TMR model?

Bathrooms, hallways, closets, laundry rooms, kitchens, stairwells, and basements represent the ideal applications. The 200-square-foot coverage suits single rooms rather than open floor plans.

How does the TMR 010 compare to flexible sun tunnels?

Flexible models use a bendable tube to navigate around attic obstacles but have lower reflectivity (~95%) compared to the TMR’s rigid 99% reflectivity. Rigid tunnels provide significantly more light over long distances.

What’s included in the standard kit?

The kit includes flashing complete with dome, 4” pre-installed top collar, two 12” elbows, 24” extension, and ceiling diffuser assembly complete with frosted diffuser. Optional accessories include ZTR Extension Tubes (24-inch or 48-inch increments), ZTC Energy Kit (dual-pane diffuser and gaskets), ZTL Electric Light Kit (for nighttime use), and ZTM Tile Flashing Kit (for tile roofs).

Can this handle Montana’s temperature extremes?

The 20-year warranty on the rigid silver tunnel suggests confidence in cold-weather performance. The aluminum construction handles thermal cycling better than plastic alternatives.

What tools are needed for installation?

Required tools include hole saw or reciprocating saw, drill/driver, tape measure, level, safety glasses, and caulk/sealant gun. Standard contractor tools — nothing specialty required.