GREENGUARD® Indoor Air Quality Certified. As part of our commitment to environmental consciousness, Hunter Douglas has commissioned the GREENGUARD® Environmental Institute to verify that this product has met its stringent indoor air quality guidelines. Along with the distinctive style and superior quality you've come to expect from us, GREENGUARD certification provides the assurance that our products are as environmentally friendly as they are beautiful for use in your home. The GREENGUARD Indoor Air Quality Certified Mark is a registered certification mark used under license through the GREENGUARD Environmental Institute. Ask Days Design Studio for list of Hunter Douglas Green Guard Certified Products.