Dimensions of 120mm case fan-diameter or diagonal?

I want to install two of these-

http://www.flipkart.com/cooler-master-90-cfm-blue-led/p/itmd7q4fcdvw3ujg?pid=COLD7Q4DF73WMYF4&_l=He6KBVf4L1udh%20tb3uTX2w--&_r=Hm9ZHljbShvygMoLNKykVA--&ref=b69b6530-af22-4946-8a34-e2d6a09f661a

My question is-do 120x120x25 mm dimensions mean 120mm diameter or diagonal?I measured my present case fan and it is 90mm along diameter and 120mm along diagonal.My PC-

http://h10025.www1.hp.com/ewfrf/wc/document?docname=c01815020&tmp_task=prodinfoCategory&cc=in&dlc=en&lc=en&os=2093&product=3929100&sw_lang=

However,I could not find any 90mm case fans,only 80mm and 120mm.Am I doing something wrong?Any help would be sincerely appreciated.
5 answers Last reply
More about dimensions 120mm case diameter diagonal
  1. 120mm is the width of the fan housing. The most common sizes are 80mm, 92mm and 120 mm
  2. Ok,that means the square within which the actual fan is placed,right?Will a 120mm fan fit in my case which probably has a 92 mm fan or only a 92mm fan will fit?Am asking because 92mm fans arent available but 120mm fans are.
  3. I can't order from Newegg as they do not ship to India. :( Also,can I fit an 80mm fan instead of my stock 92mm fan coz 80mm and 120mm fans are easily available here.
  4. I dont have that pc, so I dont know what will fit.
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