Clean or replace Lennox rooftop HVAC heat pump air filters


We have 2 Lennox roof top heat pump units in our office building. They are a T-Class unit and a CHP-Class unit, http://www.lennoxcommercial.com/products/list.asp?category_id=1 .
We like to clean or replace the air filters since it has been over a year since they were installed.
Does anyone have experience with these 2 models of HVAC and know how to gain access to the filters?
Thanks
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The smart thing to do is pay for a service call by the company that installed it. Lacking that, find a local guy who works with roof top equipment.
Then just watch him. You may decide that "next time" you will again watch him rather than DIY.
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