1. 1 Ambient Temperature Use Ranges of the BG-4

2. 2 May 21, 2003

3. 3 Draeger Safety, Inc. is clarifying the specifications regarding the ambient temperature during operation of the Draeger BG-4 Closed Circuit Breathing Apparatus

4. 4 The approved minimum permissible ambient temperature for the use of the BG-4 is -5°C 23°F.The approved minimum permissible ambient temperature for the use of the BG-4 is -5°C 23°F.

5. 5 The approved minimum permissible ambient temperature can be adjusted to -15°C or 5°F if the BG-4 is Stored at a temperature range of 20°C +/- 5°C or 68°F +/- 23°F.The approved minimum permissible ambient temperature can be adjusted to -15°C or 5°F if the BG-4 is Stored at a temperature range of 20°C +/- 5°C or 68°F +/- 23°F.

6. 6 The use of ice in the Cooling System is only required at ambient temperatures above 0°C (32°F).The use of ice in the Cooling System is only required at ambient temperatures above 0°C (32°F).

7. 7 At ambient temperatures below 0°C (32°F) ice is not required to be used.

8. 8 Draeger Safety, Inc. recommends when using the BG-4 to follow themaximum ambient temperature criteria: Draeger Safety, Inc. recommends when using the BG-4 to follow the maximum ambient temperature criteria: In maximum ambient temperatures of up to 40° or 104°F the apparatus with the cooling medium may be used up to 4 hours.In maximum ambient temperatures of up to 40° or 104°F the apparatus with the cooling medium may be used up to 4 hours.

9. 9 In maximum ambient temperatures of up to 60°C or 140°F the apparatus with the cooling medium may be used up to 1 hour.In maximum ambient temperatures of up to 60°C or 140°F the apparatus with the cooling medium may be used up to 1 hour.

10. 10 In maximum ambient temperature of up to 90°C or 194°F the apparatus with the cooling medium may be used up to 15 minutes.In maximum ambient temperature of up to 90°C or 194°F the apparatus with the cooling medium may be used up to 15 minutes. If you have any questions, regarding these specifications please contact Mary E. Doane at 1-800-922-5518 Ext 294 or your Draeger Safety Regional Sales Manager.If you have any questions, regarding these specifications please contact Mary E. Doane at 1-800-922-5518 Ext 294 or your Draeger Safety Regional Sales Manager.