Does anyone know how to change this air filter?

i have a Hunter HEPATech 30251 air filter and i can't find a switch or latch or button anywhere and since i got them from someone else i don't have the manual.any help?
Does anyone know how to change this air filter?
I was able to find a model on Hunter's site that is similar in appearance. Perhaps the owner's manual for that one will help. If not, try calling Hunter's technical support number.



Phone:

1-888-830-1326

Monday 鈥?Friday 7am 鈥?7pm CST

Saturday 8am 鈥?5pm CST



Toll-Free Canada Number:

1-866-268-1936



Don
Does anyone know how to change this air filter?
Try getting the manual from the internet.