Listings

UL Logo Listed Canada1 Optimum Window Mfg. Is listed and  is a current member of UL Canada. 
All of Optimum Window which is rated for fire carries a UL listing; the windows are tested and monitored by the Underwriters Laboratories.
Optimum Window Mfg. is a member in good standing with the Steel Window Institute.
Optimum Window Mfg. is a member in good standing with the National professional association of architects.
Optimum Window Mfg. is a member in good standing with the National Glass Associtaion.
Optimum Window Mfg. is a member with good standing with the Construction Specification Institute.
Optimum Widnow Mfg. makes all of our steel windows with recycle friendly steel.
National Fenestration Rating Council – www.nfrc.org/
National Certified Testing Laboratories – www.nctlinc.com/