The Shielded Fan Vent Series with honeycomb panels in rigidaluminum frames are available pre-drilled in five standard sizes. The lightweight honeycomb medium can be combined with an aluminum screen for dust filtration. Standard finish is MIL-C-5541 iridite, and other finishes are available. Vents come with attached EMI/RFI finger stock shielding made of beryllium-copper. These pre-drilled vents are ready to install.