DougW, and anyone else that cares to chime in,
We just got brand new BA gear recently.
New Draeger SP-550 sets and masks, built especially for the New Zealand Fire Service.
Using the same size BA Cylinder as the older Steel HP Cylinders, but with a 1/4 the weight.
We took the sets into a local Blast Chiller in temperatures of -45C and the Regulators never even froze up, even under Positive Pressure settings and Negative Pressure too!.
I like the Draeger sets, I've used them since I first started in the Fire Service, and apart from Re-Generative Oxygen(That I used as a Paid FF) they are the best!. [Linked Image]