I have the commercial type of these doors, MUCH heavier grade steel
and springs, requires a chain mechanism to raise and lower. Got the
heavy duty one after someone broke into my shop by putting a 2x4 under
the door and lifting it up enough to get a sandblaster out. Used
Overhead Door company.
Lester
On Mar 8, 2010, at 3:56 PM, John Innis wrote:
> Interesting. I have seen these in commercial applications where the
> track at the top of the door is connected to an enclosure. The
> enclosure is basically a box that hides the roll and keeps the outside
> if the door at the same distance from the wall all the time. I think
> the brand I saw was Raynor.
_______________________________________________
Donate: http://www.team.net/donate.html
Suggested annual donation $12.75
Archive: http://www.team.net/archive
Forums: http://www.team.net/forums
|