FAQs - General
What are the benefits of the TNR Aluminum Guide design versus the usual steel guide?
Control over the required releasing force of the rubber curtain from its guide is an essential design criteria. The ability to maintain a tight tolerance on the guide opening which retains the curtain edge, is paramount. An extruded, aluminum guide is fabricated within a few thousandths of an inch, whereas multiple-piece steel guides are often off target by 1/8" or more. A further detrimental effect is caused by the steel's low resilience - its inability to return to its original shape after being bent. A 1020 steel has a resiliency of 33.7 compared to 77 for the TNR heat-treated, aluminum alloy. A steel guide will exceed its resilience limit on the first curtain release causing an increase to the guide opening dimension thereby lowering the force requirement for future releases. Testing has shown that the TNR aluminum guide returns to within 0.005" of its initial position.
Most doors are shown with black rubber curtains. Are there other types of curtain material available?
While black SBR is our standard curtain material, we do offer an EPDM curtain either grey or blue. There is a slight up-charge to the base price of the door for this feature.
Which is better? Doors with counterbalance springs or the springless design?
The springless design is ideal for high cycle applications such as parking garage facilities. For openings with less traffic flow, counterbalanced doors are recommended as the price for the door is less and the springs will last for years.
How does the TNR door handle wind penetration around the curtain?
The rubber door curtain is flexible and seals itself against the guides with the slightest wind load and/or negative pressure. Our doors can attain a near perfect seal which makes them an ideal solution for clean rooms and cold weather locations.
How does TNR seal the top and bottom of their doors?
We believe we have the best top seal in the industry! We seal the top of the door against our rolling idler rather than trying to seal against the flexible curtain (which is a moving target). In addition, on the bottom of the door, we have a 5” loop seal that will mold to an uneven floor.
At what speeds will a springless door operate?
Up to 48 inches per second for heavy duty rubber doors; faster for lighter fabric doors.
What is a wind bar and what are the benefits of adding it to a door?
The traveling wind bar increases the working capabilities of the rubber door in extremely windy locations. Not all applications require this feature….please feel free to contact one of our Regional Sales Managers to review your particular application.
I see from the video the door can survive an impact. How is the door reset and at what cost?
Re-setting an impacted door is as simple as straightening the bottom bar (which is designed to bend), opening the door to the top and re-inserting the bottom bar back into the guides. This can be completed in a few moments and replacement parts costs are minimal (a ¼” mild steel bolt which is designed to shear).
What safety items are in place should someone or something be in the way during the closing cycle?
There is an extremely sensitive reversing edge at the bottom of all our doors as well as a thru-beam photo cell mounted on the jamb. If either of these safety devices are activated, the door will reverse to the open position.
Is it true that I will get a quick payback from the investment I will make to buy a New Generation TNR Industrial Door?
For doors installed in "Tough and Rough" applications the cost savings from reducing maintenance costs and maximizing up-time, the payback period is usually less than 6 months. Peace of Mind that your industrial door is going to work when you need it most --- priceless.
Is the TNR Industrial Door easy to install?
Yes. The self-supporting steel frame and sleek, installation-friendly design make for an easy, accurate and cost saving installation.