Cutting old Unused Air heating and Ventilation Pipe With Safety First

[agoh]

I am quite new to DIY so apologise if this is a dull question!
I am hoping to fit a fridge into some wall space where the old central heating system was installed. It has been deactivated and replaced by radiators when I bought the house.

Upon cutting a section of the wall, there is a huge metal pipe where I presume warm air is passed through.

My dull question is, am I able to cut the pipe?
Is there any reason there might a safety issue here? (e.g. gas??? :S)

Pictures can sometimes paint the answer, so please take a look.

Negative / positive answers welcome, but constructive comments would be appreciated.

Andrew

[lets have a look]

yes you can rip it out