![My HVAC has two filter slots. Do I need a filter in both or is it like this to give me options? : r/hvacadvice My HVAC has two filter slots. Do I need a filter in both or is it like this to give me options? : r/hvacadvice](https://preview.redd.it/my-hvac-has-two-filter-slots-do-i-need-a-filter-in-both-or-v0-qyqi5rqyo2ab1.png?auto=webp&s=4528d40649f2f95916414d1ac964f4cfdab06a29)
My HVAC has two filter slots. Do I need a filter in both or is it like this to give me options? : r/hvacadvice
![heating - how to change furnace filter (bottom return) for Lennox G43UF - Home Improvement Stack Exchange heating - how to change furnace filter (bottom return) for Lennox G43UF - Home Improvement Stack Exchange](https://i.stack.imgur.com/jC82P.jpg)
heating - how to change furnace filter (bottom return) for Lennox G43UF - Home Improvement Stack Exchange
![heating - how to change furnace filter (bottom return) for Lennox G43UF - Home Improvement Stack Exchange heating - how to change furnace filter (bottom return) for Lennox G43UF - Home Improvement Stack Exchange](https://i.stack.imgur.com/wadCV.jpg)
heating - how to change furnace filter (bottom return) for Lennox G43UF - Home Improvement Stack Exchange
![hvac - Where should my furnace filter go in a Lennox G40UHX series furnace? - Home Improvement Stack Exchange hvac - Where should my furnace filter go in a Lennox G40UHX series furnace? - Home Improvement Stack Exchange](https://i.stack.imgur.com/HW8iv.png)
hvac - Where should my furnace filter go in a Lennox G40UHX series furnace? - Home Improvement Stack Exchange
![hvac - Where should my furnace filter go in a Lennox G40UHX series furnace? - Home Improvement Stack Exchange hvac - Where should my furnace filter go in a Lennox G40UHX series furnace? - Home Improvement Stack Exchange](https://i.stack.imgur.com/O7jvV.jpg)