Draft Free 8 3/8" diameter cast aluminum talk thru is well suited for exposed application. Natural voice communication is obtained through the tensed clear plastic diaphragm while eliminating air flow. Perforated clear security screen on customer side protects the diaphragm. Talk thru has bullet resistant shield on rear side. Unit is adjustable for glazing from 1/4" to 1 7/8" thick. Optional spacer ring is required for glass less than 1 3/16" thick.
Denote glass thickness of window when ordering.
Specify finish: clear or dark bronze anodize.
Requires 7 1/2" diameter hole.
Class I or III bullet resistant.