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listed Fire-Resistance Diffuser * TVB - Thermal Vapor Blanket * Square collar
Hinged removable door with hinges parallel to the longest dimension
Standard Features * 1" rim size (2" larger than nominal duct size) * 14 gauge steel * 1305: 1/2" lattice opening
2x4 * Soft White
CB Series W/Damper R
4" 3 Hour Vertical Mount Fire Door 2665-16 Specialty Products listed Fire-Resistance Diffuser * TVBh3. Standard Features * 2661 Square or rectangular fire door for vertical mount only. Maximum dimension 60x60. For damper free area chart A click here * 2663 Out of Airstream fire door. Square or rectangular for vertical mount only. Maximum dimension 60w x 52h. For damper free area chart B click here * 2665 Round fire door for vertical mount only. Available 4" thru 52" round. * 3 hour rated * UL and California State Fire Marshall approved * 4 1 4"
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