Three Avon Protection STPAPR/IPAPR units. ST PAPR – The total respiratory protection system. This Powered Air-Purifying Respirator (PAPR) has been designed to add even greater flexibility to Avon’s revolutionary FM53T mask and is available as an optional extra with the ST53 and ST53SD. The addition of the STPAPR provides the additional levels of serviceability and comfort associated with powered air while still retaining the ability to switch instantly to the positive pressure SCBA mode when required. The STPAPR achieves this by utilising a Compact Demand Valve (CDV) fitted directly into the STPAPR. Extremely rare, part of Avon’s original push towards Special Operations oriented masks and equipment. These are not being manufactured anymore and very rare on the surplus market. These units were originally made to have a variable speed option for the blower motor, however these are single speed versions. Single speed versions, in very good, working condition, all checked with a BA-5800A/U battery on 5/6/2025. These have been stored in a climate controlled environment since being manufactured, have not seen any use beside annual inspection, these all include the OEM remote switch which is coiled and zip tied to the hose under the fabric hose cover, crush proof hose with 40mm cruciform connection, and the fabric cover for main unit. And Gen 1 VPU’s. These will require a BA-5800A/U battery, or can be used with a re-chargeable Li-ion battery provided you have the conversion kit. Easy to reach remote on/off switch. Integrated CDV for easy switch of operational modes. Enables SCBA to convert to Combination Respirator Unit (CRU). High flow rate up to 130 Liters/Min. Minimum 7 hour battery life. Chest strap for back wear. Side mount hose into the facemask. 40mm STANAG filter interface. Accepts traditional and conformal filters. Utilizes two filters for maximum flow rates. Originally intended to be used as an add-on to the ST53, being attached to the side of the air cylinder bag and allowing the operator to switch between SCBA and PAPR modes of operation depending on the requirements. These are able to be used solely as a PAPR unit, not requiring a SCBA tank. On the back are MOLLE webbing straps which allow you to attach the unit to a plate carrier. Developed and manufactured between the early 2000’s and late 2010’s, created by Avon in response to a program initiated by the The Joint Program Executive Office for Chemical, Biological, Radiological and Nuclear Defense. These were primarily used by USSOCOM, and were later replaced by the MP-PAPR and CS-PAPR units from Avon Protection in the mid 2010’s. Included in the photos is a photo of CAG/Delta Force using the STPAPR/IPAPR units along with M53 gas masks, 9.0 liter oxygen tanks, GPCF50 filters, and Gen 1 VPU’s. From a March 9th 2012 article by Military Systems and Technology. The STPAPR is available as an optional extra with the CE certified Avon ST53 and ST53SD self contained breathing apparatus and offers a fully modular powered air supply when operatives are facing extreme respiratory threats from toxic industrial materials (TIMS). It is relatively compact and takes just moments to attach by using quick connect air line couplings to the internal demand valve and a breathing hose to the mask. Robust straps locate the unit alongside the air cylinder on the ST53 and for the ST53SD/STPAPR, while a twin-pouch back pack unit ensures the combined system is very comfortable to wear. The addition of the STPAPR also provides the high level of serviceability and comfort associated with powered air while retaining the ability to switch instantly to the positive pressure SCBA mode when required.