Section II. DESCRIPTION AND DATA - TM-3-4240-201-130008

TM 3-4240-201-13

b. Use DD Form 6 (Report of Packaging and

Edgewood Arsenal, ATTN: SMUEA-DE-ET, Edgewood

Arsenal, MD 21010.

Handling Deficiencies) to report damaged or improper

d. Refer to TM 740-90-1 for administrative storage

shipment of materiel.

c. The reporting of errors, omissions, and

instructions for this filter unit.

e. Refer to FM 5-25 and TM 9-1375-200 for

recommendations for improving this manual by the

destruction instructions on this equipment.

individual user is encouraged.

Reports should be

submitted on DA Form 2028 (Recommended Changes

to Publications) and forwarded direct to Commander,

Section II.

DESCRIPTION AND DATA

(2) Size 3 hose assembly. Each size 3 hose

1-3.

Use

assembly consists of a 9-foot airduct hose, two ratchet

clamps, one pulomatic plug, and one Y-fitting and

The filter unit adsorbs toxic gases, dusts, and aerosols

socket.

from the air and supplies purified respiratory air to six or

d. Air Purifier. The M2A2 air purifier (fig. 1-4)

fewer hospital patients. These patients have wounds or

consists of a manifold assembly, a precleaner and

bandages on the neck, face, or head and cannot wear a

housing assembly, an M13 12 cfm particulate filter, an

conventional mask.

M12A1 12 cfm gas filter, and airflow control caps. The

manifold assembly closes the air outlet end and the end

1-4.

Description

plate closes the inlet end of the air purifier. The manifold

assembly has four (earlier models have three) pulomatic

a. General. The filter unit consists of the following:

sockets for attaching hose assemblies. The four sockets

headpiece, hose assembly, air purifier, transformer,

are equipped with airflow control caps. Each airflow

accessories, and repair kit. Air is drawn through intake

control cap has a ring in its middle which fits around a

holes in the air purifier where it is filtered and purified.

pulomatic socket. One end is a solid cap and the other

The purified air is blown through hoses to the

end has a hole in its center. The solid caps are used to

headpieces. Power to operate the purifier is controlled

prevent foreign matter or moisture from entering the gas

by a transformer unit. The electrical power normally

filter when the hoses are not attached to the purifier. A

supplied to the transformer is 115 volt alternating current

solid end cap is snapped over the pulomatic socket that

(ac) with emergency 24 volt battery power. If the 115 volt

is not in use. The end of the airflow control cap with the

ac power fails, the transformer automatically switches to

small hole in it is snapped over a pulomatic plug on the

the standby 24 volt dc power source. Each headpiece is

manifold when a second pulomatic socket is not in use.

stored in a carrier when not in use.

This prevents excessive air pressure from building in the

b. Headpiece. The headpiece (fig. 1-2) consists of

two pulomatic sockets in use.

six M13A1 hospital filter unit headpieces and six M12

e. Transformer. The transformer (fig. 1-5) consists

hospital filter unit headpiece carriers. The headpiece

of a step down power transformer, a case, three power

carrier is a plastic bag equipped with a buckle and a

cable assemblies, a relay, and a toggle switch. The

strap. When the headpiece is inside the carrier, the

transformer receives 115 volts ac input, which it steps

carrier is folded on the marked lines, rolled tightly, and

down to a 30 volts 3 amperes output. The transformer is

fastened with the strap and buckle. The headpiece is a

capable of operating on a 24 volts dc power source. The

hood that fits loosely over the patient's head. The plastic

case is marked to identify the three power cables as

headpiece consists of the hood, inlet adapter mount,

follows: LEAD TO 115 V 60 HZ SUPPLY; LEAD TO 24

outlet valve, eyepiece, and strap. The strap provides the

V BATTERY; and LEAD

means for fastening the headpiece around the neck of

the patient as shown in figure 1-1.

c. Hoses. The hose assemblies (fig. 1-3) consist

of two size 3 hose assemblies and six size 2 hose

assemblies.

(1) Size 2 hose assembly. Each size 2 hose

assembly consists of a 6-foot airduct hose, two ratchet

clamps, a pulomatic plug, and an is: let adapter.

1-2