Plain English: Large duct openings through the perimeter need a permanent physical barrier, an inspection port and acoustic treatment. An alarm sensor is not a substitute. Action plan Run the numbers. Bars or grilles are required when an op …
Ducts are the largest openings in most SCIF perimeters. Tech Spec §3.G.7 sets a size threshold above which a duct must be physically barred. The rule. "All vents or duct openings that penetrate the perimeter walls of a SCIF and exceed 96 s …
… plenum connects to non-SCIF space. Settle this on the pre-construction checklist. Ducts. Openings larger than 96 square inches need bars, grilles or metal baffles, unless one dimension is under 6 inches (3.G.7.c). IDS is not listed as a sub …
Steel bars of at least ½-inch diameter, welded 6 inches on center, that protect perimeter duct and vent openings over 96 square inches unless one dimension is under 6 inches (Tech Spec 3.G.7). See: Penetrations, Utilities & Life Safety
… seal both sides finished to match the wall; maintain acoustic performance; add bars if a duct opening exceeds 96 square inches; fill and cap spare conduit with acoustic fill. Do not cut hardening layers (expanded metal or plywood in Wall B …
… least 12 characters and changed every six months, unless PIV/CAC authentication is used. Duct and vent openings larger than 96 square inches need bars, grilles or baffles. IDS is not listed as a substitute. Field note: Put all twelve on the …
When a duct penetration meets the size trigger, Tech Spec §3.G.7 allows bars, one of several grille options, or permanently installed metal baffles. Protection Tech Spec / UFC specification Man-bars "minimum of 1/2 inch diameter steel, wel …
… same as the walls Class 5 vault door FED-STD 832 also covers openings: those exceeding 96 square inches and over 6 in. in the smallest dimension require 9-gauge expanded metal mesh or rigid steel bars at least 1/2 in. in diameter, welded 6 …
… lock on the primary door (3.E.2) Same lock family Openings in Perimeter Exceeding 96 Square Inches Bars, grilles or baffles over 96 in² (3.G.7.c) Same threshold BMS on Perimeter Doors; Interior Motion Detection UL 634 Level II HSS and moti …
… eight inches of reinforced concrete" Compressive strength "of at least 2,500 pounds per square inch (psi)" "steel reinforcing rods, a minimum of 5/8 inches in diameter, positioned centralized in the concrete pour and spaced horizontally and …
… 2 V-245798 … Vault/Secure Room Storage Standards - Openings in Perimeter Exceeding 96 Square Inches 3 V-245802 … Secure Room Storage Standards - Balanced Magnetic Switch (BMS) on Perimeter Doors 4 V-245803 … Secure Room Storage Standa …
Every opening is a forced-entry, acoustic and TEMPEST question at the same time. Trap Why it fails Fix Source type Duct over 96 sq in, with no dimension under 6 in, lacking bars, grilles or baffles Tech Spec 3.G.7 Bars, grille or baffles pe …
… than any other trade. Most of the issues are settled by where equipment sits and how ducts cross the wall. Location. "Utilities and general building support spaces should remain outside of the secure areas" (UFC 4-010-05 §3-3.3.2). Air han …
… after finishes. These are the findings that recur. Failure Requirement it breaks Basis Ducts over 96 sq in (no dimension under 6 in.) without bars, grille or baffles Tech Spec 3.G.7 Primary No inspection access port, or port outside without …
… vault GSA-approved modular vault meeting AA-V-2737 Reinforced concrete Minimum eight inches of reinforced concrete; compressive strength rating of at least 2,500 psi; steel reinforcing rods at least 5/8 inch diameter, centered in the pour, …
Walls are rarely the reason a SCIF fails acoustically. Doors, glazing and ductwork usually are. Doors. Use STC-rated door assemblies: door, frame, seals, threshold and drop seal tested together (UFC 3-4.6.1). Lab rating no less than STC 50 …
Bars and baffles hidden inside ductwork must be inspectable. Otherwise nobody can confirm they are still there. Access port requirements. Option Requirement Inside the perimeter (preferred) "an access port shall be installed inside the secu …
… fits. Speakers move air. They fill air paths: plenums, ceiling voids, raised floors and ducts. Surface transducers vibrate the structure they are mounted on: door frames, studs, glazing, duct walls and pipes. The building element itself bec …
The problem. An HVAC duct is a large hole in the shield. A 12-inch-wide rectangular opening has a cutoff near 0.5 GHz (5.9 / 12), so frequencies above that pass through it freely. The solution. A honeycomb vent splits the opening into many …
… was run correctly. Each trial is four consecutive steps at one step per second, about 30 inches (± 3 inches) per step, with 3–5 second pauses. The alarm must activate on at least three of every four trials "made by moving progressively t …
Pipes and conduit are smaller than ducts but far more numerous, and most are metal. The physical rules are simple (minimize, seal, finish). The TEMPEST rules apply only when the CTTA's review calls for countermeasures. DoD treatment when TE …
… and are escorted. Recurring testing (7.D.3): "Semi-annual IDS testing shall be conducted to ensure continued performance." Test Method and pass criterion Motion Each trial is four consecutive steps at one step per second, about 30 in ± 3 i …
… 0.87. Attenuation falls to zero as f approaches fc. Worked example: a 1-inch tube, 5 inches long, air-filled Step Calculation Result Diameter 1 in = 2.54 cm D = 2.54 cm Cutoff 17.6 / 2.54 fc ≈ 6.9 GHz Length in diameters 5 in / 1 in L/D = …
… report that most SCIF doors fail accreditation because of installation, not defective products. Set frames plumb, level and square before the wall is finished, because a racked frame causes binding deadbolts, gaps at seals and misaligned do …
… Review directs otherwise, UFC 3-4.11.2 says to ground metallic sprinkler pipe within 6 inches of the penetration using No. 4 copper wire to the building grounding system. In an RF-shielded room, use the shield vendor's engineered pipe waveg …
Knowledge base · public-level
Ask a question the way you would ask a colleague on the jobsite. SCIF Answers covers ICD 705, the IC Tech Spec, UL 2050 Extent 3, doors and locks, acoustics, RED/BLACK and RF shielding: 344 sections across 19 modules, each one citing the public document it relies on.
Built 12 September 2026. Public-level information only: the Accrediting Official, Cognizant Security Authority and CTTA set the requirements for any real facility. Planning a SCIF or SAPF? Talk to LA CCTV Supply or see SCIF Security.
