• One Self trimming unit: 18″ wide by 24″ high
• Fits all 16″ centers 2×4’s and 2×6’s;
• Six patented rip-tab knockouts in most common positions
– Four true 4″ diameter knockouts (two rear, two right upper and lower)
– Two 3″ x 4.5″ oval knockouts (left upper and lower)
Oval knockouts are provided for non-standard connections to existing venting (i.e.
squashed duct),or for a round to oval adapter.
• 4 starburst knockouts for gas connections and venting
• 6 pre-drilled mounting holes
• Plastic meets UL® standard 94 HB tests for flammability
Built by Builders Best in the USA.