My area in Pune is little bit dusty due to nearby construction. Bought it about two months back, I tried to mount it from smallest slot but when the fan started, it fell off from my usha fan. I packed it back and kept it aside for one month. During Diwali cleaning saw the box again and saw the customer care email ID behind. I pulled them up over mail, as the product was faulty.
It took us 3-4 days to realise, it actually works, as the cough just did not go the next day, but it gradually did.
They politely requested me to try it again with a tape as my fan blade appeared to be little smaller. They came on a video call, asking me to apply two layers tape for each slot. It worked like charm. I have been using it for about a week now. Me and my wife both are allergic, and we are coughing less than we used to earlier. Though it took us 3-4 days to realise, it actually works, as the cough just did not go the next day, but it gradually did.
Best part is it does not take any additional electricity or additional space on my room.
This is how the filter look like after few days, I did not bother to clean my fan blade while mounting this. As you can see after two layers of tape it does not slide side ways. I feel it works even better if they room is isolated by closing door and windows. Best part is it does not take any additional electricity or additional space on my room.