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listed Fire-Resistance Diffuser * TVB - Thermal Vapor Blanket * Square Collar
blades prevent metal on metal rattle
Standard Features * Gang-operated opposed blade radial volume control damper for use with RD Series Round Diffusers * Available in 2" increments from 6"-24"
T-Bar Fixed Core Step Down Diffuser
Designer Color or Satin Anodized Finish available on this product
Step Down Diffuser with Slide-in Damper 425-20X20 Commercial listed Fire-Resistance Diffuser * TVBStandard Features * Steel galvaneal construction * For evaporative coolers or central blower systems * Modern step down design * 4 way air diffusion * Countersunk mounting holes for flush appearance with color matching Phillips posi drive screws * One piece removable slide damper for off season closure * Soft White
