I help my partner around the condo by changing the air filters in the Heating plus A/C system… Everything else that goes with lake condo maintenance plus maintenance, he does, however he consistently has the air filters in the cupboard in the oil furnace room, all I need to do is pull 1 out of the box plus put it in the oil furnace, but last week, I pulled out an air filter, however it didn’t want to go in, i tried it front to back, back to front, plus every side first, however it wouldn’t go in. He marked the box just like every box, so I thought maybe there was some dirt in the air filter compartment. I got the vacuum plus sucks out any dirt there, plus I tried to install the air filter again; When it didn’t fit, I tried to shove it in, plus all I did was get it stuck. I called my partner plus asked what I did wrong. He said I was actually using the wrong air filter, however there was only 1 box there, plus it was the same box I consistently removed air filters from. He was getting frustrated plus said he had a meeting in ten hours. He didn’t have time to discuss air filters with myself and others on the iphone. I hung up plus called the Heating plus A/C company. When the Heating plus A/C company arrived, he said I was trying to install the wrong air filter. I said I didn’t guess it was the wrong air filter. He looked at the box, plus said the right numbers were on the box, however the wrong air filter was in it. It was my partner’s fault, plus not mine.