Technical Manual C1 (TM 3-4240-216-20P) M13 Tank Gas-Particulate Unit
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Technical Manual C1 (TM 3-4240-216-20P) M13 Tank Gas Filter Unit
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This Technical Manual Change 1 for TM 3-4240-216-20P covers the M13 20 CFM Tank Gas-Particulate Filter Unit and is dated April 1963. It applies to the original TM 3-4240-216-20P manual issued on February 11, 1963 and is associated with FSN 4240-601-8372. For collectors of U.S. Army technical manuals, Chemical Corps material, Cold War protective equipment, and military maintenance literature, this is a useful period document tied to a specialized and less commonly encountered Army filtration system.
Unlike a full base manual, this item is an official Change 1 publication. That means it was issued to revise and update the original TM 3-4240-216-20P rather than replace it outright. For collectors, that matters. Army manuals were routinely kept current through numbered changes, and surviving change issues help document how maintenance guidance, parts support, and technical information evolved while the equipment remained in service. In that sense, this is not just a supplemental insert. It is part of the actual service history of the manual.
The M13 20 CFM Tank Gas-Particulate Filter Unit
The M13 belongs to the broader family of U.S. military gas-particulate filtration and collective-protection support equipment. As identified by its nomenclature, it is a 20 CFM tank gas-particulate filter unit, placing it squarely in the support side of Army chemical-defense and protected-environment operations rather than in the category of conventional weapons or vehicles.
A filter unit of this type was associated with the need to provide filtered airflow for armored or enclosed protected spaces, helping support personnel operating in environments where airborne chemical or particulate hazards were a concern. The 20 CFM rating identifies it as a compact but purpose-built military filtration unit intended for protected systems where clean airflow and contamination control mattered.
For collectors, that makes this manual change especially interesting because it documents the technical side of Cold War protective systems rather than more commonly seen combat equipment. It is a useful example of the Army’s broader readiness infrastructure during the chemical-defense era.
What This Manual Change Covers
Because this publication is tied to TM 3-4240-216-20P, it belongs to the maintenance, parts-support, and technical-reference side of Army documentation. In practical terms, a manual change like this is especially relevant for updated service information related to:
- equipment identification and nomenclature
- maintenance and servicing reference
- repair-parts and support-documentation context
- corrections or revisions to the original manual
- archival and restoration research
- collecting complete service-era manual sets
Since this is Change 1 for the February 11, 1963 issue, it is especially useful to collectors who want to pair it with the original base manual and preserve the manual as it was actually updated and used in service.
Historical Significance
The date April 1963 places this publication in the early Cold War period, when the U.S. military maintained extensive technical literature covering chemical defense, filtration, decontamination, and protected-environment support systems. Manuals and change sheets like this reflect a period when Army documentation extended far beyond weapons and vehicles to include the equipment required to help units remain operational in hazardous conditions.
For collectors and historians, this manual change is especially relevant to subjects such as:
- Cold War U.S. Army technical manuals
- Chemical Corps and protective equipment
- gas-particulate filtration systems
- collective-protection support equipment
- dated military paperwork and manual changes
Because it covers a specialized filtration unit rather than a more common vehicle or weapon system, it also adds variety to collections that already include standard ordnance or maintenance manuals.
About This Item
This listing is for Technical Manual Change 1 for TM 3-4240-216-20P covering the M13 20 CFM Tank Gas-Particulate Filter Unit, dated April 1963. It was issued for the February 11, 1963 printing of the original TM 3-4240-216-20P manual and is associated with FSN 4240-601-8372.
It is especially well suited for:
- U.S. Army technical manual collections
- Chemical Corps and protective-equipment displays
- Cold War military paper collections
- museum exhibits on military field support systems
- archive and research libraries focused on U.S. military technical publications
Because manuals were working documents, surviving examples are valued not only for their content, but also for their connection to real military maintenance and support practice.
Why This Manual Matters
Many military manuals focus only on base editions, but change sheets are a major part of how Army documentation was actually maintained in service. This item adds a layer of authenticity and completeness that a base manual alone does not always provide.
For collectors, it is a useful companion piece to the original TM 3-4240-216-20P. For researchers, it helps document the continued maintenance and support history of the M13 20 CFM Tank Gas-Particulate Filter Unit. For museums, it adds context to the administrative and technical side of a protective system that is far less commonly documented than standard combat equipment.
Ideal For
This manual is a strong fit for:
- U.S. Army technical manual collections
- Cold War Chemical Corps displays
- filtration and protective-equipment collections
- museum and archival reference libraries
- collectors of military paperwork and dated technical publications
Approx length 10", Approx width 8", Approx height .2", Approx weight .2lbs.
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