www.bullard.com
DC50 Series Dual-Cool Climate Control
Tube and DC70 Vest Instruction Sheet
The DC50 Dual-Cool tube is approved by NIOSH to supply a continuous flow
of cool air to certain Bullard supplied air respirators. Please consult the
NIOSH approval matrix in your respirator user manual to verify that the DC50
is NIOSH approved for your specific configuration. All Bullard parts must be
present and properly assembled to constitute a NIOSH-approved respirator.
Air Quality Requirements
Grade D breathing air must be supplied to the point-of-attachment of the Bullard
air supply hose, where the air supply hose connects to the fitting. Always use an
inlet filter on your air source and monitors and alarms as necessary to assure
clean, breathable, Grade D air.
Supplied breathing air must at least meet or exceed the requirements
for Type 1 gaseous air as described in the Compressed Gas
Association Commodity Specification G-7.1 (Grade D or higher quality)
and specified by Federal Law 42CFR, Part 84, Subpart J, 84.141(b) and
29 CFR 1910.134(i)(1)(ii).
The requirements for Grade D breathable air include:
Oxygen ............................................................. 19.5-23.5%
Hydrocarbons in mg/m
3
of gas .................. 5 mg/m
3
max.
Carbon monoxide .......................................... 10 ppm max.
Carbon dioxide ......................................... 1,000 ppm max.
Odor ............................................... No pronounced odor*
No toxic contaminants at levels that make air unsafe to breathe.
*
Specific measurement of odor in gaseous air is impractical. Air normally may
have a slight odor. The presence of a pronounced odor should render the air
unsatisfactory.
Contact the Compressed Gas Association (1235 Jefferson David Highway,
Arlington, VA 22202 or www.cganet.com) for complete details on Commodity
Specification G-7.1.
For technical assistance, contact Bullard Customer Service at 877-BULLARD
(285-5273).
For use with Airline Respirators
WARnIng
Before using this product, read and follow all directions and warnings,
including those in the respirator instruction manual.
The respirator’s air source must supply clean, breathable air, Grade
D or better, at all times. The respirator does not purify air or filter out
contaminants.
Connecting the respirator to a line supplying Nitrogen or other harmful
gases could cause death or serious injury.
The DC50 Dual-Cool tube cannot be used with a low pressure air source
such as an ambient air pump.
Failure to follow these instructions could result in death or serious injury.
