Louvered blinds are either custom shop fabrications or internet sales of the most common window dimensions.
There are currently no consistent thermal performance standards for louvered blinds. This website lists manufacturers offering a 10-year or more warranty on their products. Additionally, the product warranty(ies) must be posted on the manufacturer's website.
NOTE: All corded window covering products sold or manufactured in the US must comply with the new ANSI/WCMA Standard, A100.1-2012 “American National Standard for Safety of Corded Window Covering Products.” Be sure to only purchase products that are labeled as complying with this standard.
If you have existing corded products that do not comply, free retrofit device kits are available through the Window Covering Safety Council.
Alphabetical List of Qualifying Manufacturers and National Retailers:
Representative Trade Association: