24 gauge Stainless Steel. Two Piece Design
 
Heavy duty frame for easy installation
 
Removable access door with handle for easy cleaning. 
 
Two standard sizes 
 
8 x 8 fits minimun wall opening: 7.625" x 7.625"
13 x 13 fits minimun wall opening: 12.250" x 12.250"
 
Made in the USA. Lifetime Warranty