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Hi, I'm Tim and I'm an HVAC expert here to assist you with your questions. Please provide all information I request as it makes it more difficult to troubleshoot something when I'm not there onsite. Essentially, you become my eyes and ears. Thanks for the opportunity to help. At the end of our dialog, you will have a chance to rate my service, but please wait until we are finished and you're satisfied you have all the information you need. Please be patient as many times we work with several customers at once.
The two filters attach to the core with "clips". See page 19 of this installation manual for their location. If you don't have clips, you may need to order from a Lifebreath distributor such as this one.
Sorry was looking at the 100/155 series. The filters should be near the top right at the inlet and outlet and looks like there are 2 different sizes.
The filters should be identical in composition. But I show the smaller filter goes to the left as facing the front. See this document.
Unfortunately, there are no really good pictures that I could find on the internet.
Let me check with Lifebreath tomorrow, see if I can find a solution.
In the meantime if you can upload some pictures of the inside of unit and where you are placing filters, it would be helpful. It makes it really tough to troubleshoot over the internet and a good visual always helps.
Also, serial number of the unit will help should it be needed.
OK, and pictures will be great as soon as you can.
To add pictures, save to your PC and upload using the small paper clip icon at the top of answer box.
Are you using a desktop?