New York Metro-based Ducts Unlimited is the design-engineering and sub-contract-manufacturer of flexible, non-metallic ducts to militaries and their defense contractors worldwide. We produce ducts measuring 2 to 48in (50 to 1,200mm) in lengths up to 50ft (15M).


Ducts Unlimited’s manufacturing center houses a broad variety of performance-coated fabrics for military ducting: neoprene, PVC, polypropylene, silicone, and thermoplastic rubber, all dedicated to delivering portable air handling products for use in every operational environment for any mission. All processes within the center conform to the quality requirements of ISO 9001:2000.


Ducts Unlimited is the only military-specific HVAC and ECU system duct supplier that has designed and manufactured countermeasures ducting. This includes:

  • Chemical and biological barrier (CB) ducting that provides no less than eight hours blockage before breakthrough to hydrocyancic acid (AC), cyanogen chloride (CK), Sarin (GB), mustard gas (HD), thickened soman (tGD), VX nerve gas, acetone, actonitrile, anhydrousammonia (G), 1, 3-Butadiene (G), carbon disulfide, chlorine, dichloromethane, diethylamine, dimethyl, formamide, ethyl acetate, ethylene oxide (G), hexane, hydrogen chloride, methanol, methyl chloride, nitrobenzene, sodium hydroxide, sulfuric acid, tetrachloroethylene, tetrahydrofuran, toluene, carbonyl chloride (CG), dimethyl sulfate and hydrogen cyanide (HCN)
  • Electromagnetic interference (EMI) ducting that provides no less than 75db of shielding effectiveness in the 100MHz-1GHz range, with 65db shielding past that to 12GHz
  • Infrared reflective (IR) ducting that provides no less than 42% reflectance in the 620-860nm range (383 Green) and 72% reflectance in the 600-900nm range (686A Tan)


Ducts Unlimited works with ALL the color charts from ALL the world’s militaries. Whatever your requirement: DLA (Defence Logistic Agency), FS595 (Federal Standard 595, Rev. B) or RAL (German Institute for Quality Assurance and Certification), we can supply ducts in those exact colors.

Desert Tan supply and return ducts.
Olive Drab supply and return ducts.
Ducts Unlimited manufacture military ducts from 2in to 48in (50mm to 1,200mm).


Although outlet ports for HVAC and ECU systems are largely standardized within any one army, their specifications can vary from country to country, and sometimes even among services within a country. Ducts Unlimited supplies to a variety of fighting forces worldwide, so it is important that our range of ducts be as versatile as possible. With access to virtually all HVAC and ECU systems specifications, and with their country-to-country interconnect standards to tents or trailers available, Ducts Unlimited can always “cuff” ducts to the requirements of the appliance they will be attached to. From a simple belt and buckle to a more elaborate stainless steel twist-and-lock, a secure fit is assured every time. We also provide insulation where specified, in polyester fabrics or foams up to 1in thick.


As the premier ducting sub-contract manufacturer to primary defense contractors, Ducts Unlimited strictly adheres to all U.S. military specifications, including over 20 that are duct-related, notably SAE-AS38386 (aerospace), SAE-AS7365 (ground heaters) and MIL-H-18158E (shipboard ventilation). Today, Ducts Unlimited has over 150,000 linear feet of ducting in service worldwide. Their applications include: command posts, hospitals, decontamination facilities, communications centers and tactical shelters, in theatres all over the world.