Carlson 29.5–36.5” Extra Wide Dog Gate with Small Pet Door, Walk-Through Pressure Mounted Metal Indoor Pet Safety Gate, Tested and Trusted by Pet Parents, American Designed, American Owned

You need to move the litter box to a less-humid room. The steam/humidity is making it easier for you to smell the litter. Put in in a room and put a baby gate with a cat door in that doorway. We have this one https://amzn.to/4uQnOHT We also recently bought stainless steel litterboxes. They cannot be scratched like the plastic ones, therefore odors cannot be trapped in the box material itself. We have two cats, and one is a Maine Coon so we bought the 2-pack in the XL size here https://amzn.to/3QrumyQ For the litter we buy the Arm & Hammer brand, any variety. It is less 'dusty' and not overly-scented.

I have this gate and it works perfectly https://www.amazon.com/Carlson-Extra-Wide-Through-Small/dp/B000JJDI0G/ref=mp_s_a_1_23?crid=1663FLCNBMKHE&dib=eyJ2IjoiMSJ9.Q7B7jnqpCWyoBSTmava43-jOyz9HXc7PlvUCf9c0zynAQ2uze4j557KBfk7a0UTcib3Ul6Gagm0T09Zms0h8dA.tYl4AQkDKuosk8MBVJ6Fh_xe1ZLv_5a39cSAhzcvSz8&dib_tag=se&keywords=gate+with+cat+door&qid=1780513994&sprefix=gate+with+c%2Caps%2C172&sr=8-23