FireStopper® Residential Size Extinguishers

Class (A) Test Cribs

(CAN/ULC-S508 ยจ ANSI/UL 711)

Wood-Crib Construction Specifications

Classification and RatingNumber of Wood MembersTrade Size and Length of Wood MembersArrangement of Wood Members in Crib
1-A72mm: 38 by 38 by 500
in: 2 by 2 by 20
12 layers of 6
2-A112mm: 38 by 38 by 635
in: 2 by 2 by 25
16 layers of 7
3-A144mm: 38 by 38 by 735
in: 2 by 2 by 29
18 layers of 8
4-A180mm: 38 by 38 by 800
in: 2 by 2 by 32
20 layers of 9
6-A230mm: 38 by 38 by 925
in: 2 by 2 by 36
23 layers of 10