25 x 20 in. 30 ga Return Air Duct Plenum
25 x 20 in. 30 ga Return Air Duct Plenum
Product Details
Product Description
- ASTM-A653 CS type B galvanized steel, G-30 coating LFQ chemical treatment
- Ceiling boot assembled with C-115 2/16" zinc coated steel rivets and has a rectangular opening
- The collar is 3-1/2" tall roll formed 30GA steel with 1/4" roll formed beading
- Knauf equipment liner M with ECOSE® technology available
- Thickness: R4 - 1", R6 - 1 1/2", & R8 - 2"
- ASTM C 1071, type I, flexible (replaces obsolete federal specification HH-I-545B.) NFPA 90A/90B, ASTM C 665/1617 temperature range (ASTM C 411), microbial growth (ASTM C1338, G21)
- 504D - with damper 504R6DBT - dB top without collar available in 26GA upon request