The deployment was in two parts, the first in North Tallcree and the second at Peace River. Both fires are now under control but international crews are still in the areas dampening down and monitoring.
Mr Cox said he spent most of his time in the air, commanding fire crews from a helicopter and relaying messages back to base.
In his second shift he was teamed up with a crew of 20 Mexicans that had only one English speaker.
"We were mopping up, securing boundaries of the fire so it didn't take off and go again if the winds changed. We worked on several fires for 12-hour days. It was so flat we could see for miles and miles. I'm now admiring the hills again."
Mr Cox has been volunteering with Pumicelands since he started work with forest managers Timberlands in 2008.
The thinning-to-waste programme manager has previously been deployed to Australia twice and has fought fires across New Zealand.
He said it was a valuable experience that he was looking forward to sharing with his colleagues.
"We'll all be meeting in Wellington for a debrief to discuss what we've learned and what we could have done better as well as what could work here."
National Rural Fire Officer Kevin O'Connor said the firefighters had shown their mettle during the long, strenuous deployment.
"Their skills - especially in logistics and working effectively in remote locations using aircraft - proved really useful and were in high demand."
Canada firefighting
•The deployment followed a request from the Canadian Interagency Forest Fire Centre.
•New Zealand previously lent support to Canadian authorities in August 2009 during an outbreak of wildfires.
•New Zealand firefighters have also helped their counterparts in Australia nine times and in North America six times in the past 15 years.
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