EVAHL Frequently Asked Questions (FAQ)

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 Regulatory Top

Is the EVAHL NIOSH Approved?
Yes. You may view the Approval Letter and Approved Component Matrix.

Does the EVAHL have an Assigned Protection Factor (APF) of 1,000?
Yes. You may view the independent, 3rd Party Documentation from RDECOM.

What Hazardous Location Certification does the EVAHL have?
The EVAHL is certified by CSA International (Certificate 2510928) for Hazardous Classified Locations according to ANSI/ISA 12.12.01

The Hazardous Location and Temperature Code designations are:
    Class I, Division 2, Groups A, B, C, D
    Class II, Division 2, Groups F, G
    Class III
    Temperature Code T6, Ta = -40°C to +50°C

You may view the CSA Certificate of Compliance.

To what hazardous location standard is the EVAHL approved?
ANSI/ISA 12.12.01

Why does the EVAHL battery have a locking screw?
In order to comply with the ANSI/ISA 12.12.01, precautions must be taken to limit energy release and to prevent sparking. The more powerful a battery is, the more stringent the precautions must be. In general, PAPR batteries are far more powerful than flashlight batteries and those of other small devices. This is largely due to the four hour minimum run times required by NIOSH test specifications but also due to the performance characteristics desired by the majority of users. Although there are many ways to meet the requirements of the standard, for the EVAHL and its energy capacity and classification, there were essentially two options considered. One option was to design the system so that the battery is internal and non-removable. Another option was to allow the battery to be removed but only with a tool. This helps prevent sparking by ensuring that, if the unit is dropped, the battery doesn't create a spark and by forcing the user to leave the hazardous environment to remove or install batteries with the tool.

Is the EVAHL Intrinsically Safe?
The term intrinsically safe is often misused and misunderstood. According to the Fire Protection Handbook, intrinsically safe is defined as "...equipment and wiring incapable of releasing sufficient energy under normal or abnormal conditions to cause ignition of a specific hazardous atmospheric mixture." OSHA 1910.307(c)(1) states that intrinsically safe equipment and associated wiring approved as intrinsically safe is permitted in any hazardous (classified) location for which it is approved. Neither of these definitions clearly indicate the type of equipment that is appropriate for a given location. What is clear, is that electrical equipment will be marked by a certifying agency for the type of Hazardous Classified Location it is allowed to be used in. The EVAHL is certified as Nonincendive Electrical Equipment for use in Class I and Class II, Division 2 and Class III, Division 1 and 2 Hazardous Locations. A more appropriate question to ask is: "What classification does the environment have where the electrical equipment is to be used?" Once this question is answered then select electrical equipment that has the same classification.

What is a hazardous classified location?
The National Electrical Code (NEC) defines hazardous locations as those areas "where fire or explosion hazards may exist due to flammable gases or vapors, flammable liquids, combustible dust, or ignitable fibers or flyings."

A substantial part of the NEC is devoted to the discussion of hazardous locations. That's because electrical equipment can become a source of ignition in these volatile areas. Articles 500 through 504, and 510 through 517 provide classification and installation standards for the use of electrical equipment in these locations. The writers of the NEC developed a short-hand method of describing areas classified as hazardous locations. One of the purposes of this discussion is to explain this classification system. Hazardous locations are classified in three ways by the National Electrical Code: TYPE, CONDITION, and NATURE.
Source: http://www.osha.gov/doc/outreachtraining/htmlfiles/hazloc.html

What are the appropriate OSHA standards surrounding hazardous classified locations?
OSHA Standards 1910.307 Hazardous (classified) locations, 1910.399 Electrical Definitions to Subpart S, and 1926.407 Safety and Health Regulations for Construction Subpart K Electrical Hazardous (classified) locations are three of OSHA's most applicable standards.

What is a Class? What are the differences between Class I, Class II and Class III?
A Class distinguishes the type of hazardous location according to the combustible material found in the atmosphere.

  • Class I Locations refer to locations that have potentially explosive concentrations of flammable gases or vapors in the air.
  • Class II Locations refer to locations that have potentially explosive concentrations of combustible dust.
  • Class III Locations refer to locations that have potentially explosive concentrations of easily-ignitable fibers or flyings present.

What is a Division? What are the differences between Division 1 and Division 2?
Divisions refer to the kind of conditions under which the hazard is present.

  • Division 1 refers to conditions that are normally hazardous and potentially explosive.
  • Division 2 refers to conditions that are not normally present in explosive concentrations (but may accidentally exist).

What is a Group? What are the differences between Groups A, B, C, D, E, F, G? Groups refer to the specific types of combustible gases, vapors, or dusts within the different Classes. The table (from http://www.osha.gov/doc/outreachtraining/htmlfiles/hazloc.html) below summarizes the differences:

I Gases, Vapors and Liquids NEC
(Art. 501)
A: Acetylene
B: Hydrogen and equivalent in hazard
C: Ether and equivalent in hazard
D: Hydrocarbons, Fuels, Solvents, and equivalent in hazard
Normally explosive and hazardous conditionsNot normally present in an explosive concentration
II Dusts
(Art. 502)
E. Metal dusts (conductive and explosive)
F. Carbon dusts (some are conductive and all are explosive)
G. Flour, starch, grain, combustible plastic or chemical dust (explosive)
Ignitable quantities of dust normally are or may be in suspension, or conductive dust may be presentDust not normally suspended in ignitable concentration (by may accidentally exist). Dust layers are present.
III Fibers and flyings
(Art. 503)
Textiles, wood-working, etc. (easily ignitable, but not likely to be explosive) Handled or used in manufacturingStored or handled in storage (exclusive of manufacturing)


Is the EVAHL NIOSH approved with the GRH grinding hood?
The EVAHL is not NIOSH approved with the GRH grinding hood. The GRH is designed for grinding applications which typically produce sparks that are not appropriate for a potentially explosive environment.

Is the EVAHL NIOSH approved with the Spectrum Full Facepiece?
The EVAHL is not currently NIOSH approved with the Spectrum Full Facepiece but there are plans to add this approval in the future.

Is the EVAHL approved with the FAMB2 Half Mask?
The EVAHL is not currently NIOSH approved with the FAMB2 Half Mask but there are plans to add this approval in the future.


Does the EVAHL use the same battery as the EVA?
The EVA and the EVAHL batteries use the same Lithium chemistry and visual fuel gauge technology but are packaged in unique housings that prevent interchangeable use.

Does the EVAHL battery have a visual fuel gauge?
Yes, the EVAHL battery has the same visual fuel gauge as the original EVA.

How long will an EVAHL battery last?
An EVAHL battery will operate the EVAHL blower for a minimum of 4 hours and a maximum of 12 hours or more, depending upon the age of the battery, the filter type, the head top, and the loading conditions. An EVAHL battery is expected to have a useful operating life of approximately ≥300 charge/discharge cycles.

What type of battery is in the EVAL?
The EVAHL is powered by a rechargeable Lithium Ion Polymer battery.


What Types of Chargers are available for the EVAHL?
The EVAHL has three battery charger options: a single charger, a six port (gang) charger, and a single port genius charger/analyzer.

Is the EVAHL battery compatible with the EVA charger?
The EVA and EVAHL battery chargers share common power supplies but the cup assembly where the battery nests on the charger are unique to each version.


How long will an EVAHL filter last?
The exact service life of any PAPR filter is variable depending upon usage conditions. The PAPRFC3 HE filter should be replaced when the EVAHL blower unit cannot deliver enough air to pass the pre-operational airflow indicator test. The PAPRFC4 OVAGHE filter cartridge

What types of filters are NIOSH approved with the EVAHL?
The EVAHL is approved with two filters: the PAPRFC3 High Efficiency Particulate (HE) filter and the PAPRFC4 Organic Vapor, Acid Gas, HE filter cartridge.


What applications are appropriate for the EVAHL?
The EVAHL PAPR is appropriate for non-IDLH environments which require respiratory protection of up to 1,000 APF and that also carry an electrical safety hazardous location classification of Class I, Division 2 Groups A, B, C, D or Class II, Division 2, Groups F, G or Class III. It is the responsibility of the employer to accurately assess the work environment and select the proper Personal Protection Equipment (PPE).
Reference: http://www.osha.gov/pls/oshaweb/owadisp.show_document?p_table=STANDARDS&p_id=9701

Are there any applications for which the EVAHL is not appropriate?
Yes, there are several applications for which the EVAHL is not appropriate. Below please find a partial listing:

  • IDLH (Immediately Dangerous to Life or Health) environments are never appropriate for the EVAHL (or any other PAPR) Sources: OSHA 1910.134(d)(2) and NIOSH PAPR Limitations
    Reference: http://www2a.cdc.gov/drds/cel/cl.htm#PAPR_1
  • Any environment in which the filter is not appropriate for the hazard is not appropriate for the EVAHL.
  • Any environment which is oxygen deficient is not appropriate for the EVAHL.
  • Class I, Division 1 and Class II, Division 1 environments are not appropriate for the EVAHL.
  • Class II, Division 2, Group E environments are not appropriate for the EVAHL.
  • The EVAHL is not appropriate for Abrasive Blasting applications (nor is any PAPR).
        · Only Type CE Respirators are appropriate for Abrasive Blasting.
        · By definition, all Type CE Respirators are Supplied Air Respirators.
    Reference: http://www.cdc.gov/niosh/npg/nengapdxcce.html
  • The EVAHL is not appropriate for Welding and Grinding applications.


How much does the EVAHL Weigh?

ConfigurationWeight in lbs.
EVAHL Blower, HE Filter, Battery, EVABELT14.05
EVAHL Blower, HE Filter, Battery, EVABELT24.20
EVAHL Blower, OVAGHE Filter, Battery, EVABELT15.50
EVAHL Blower, OVAGHE Filter, Battery, EVABELT25.75

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