Your tenants live a healthier life and you increase the value of your housing stocks.
Since healthy living begins with fresh air.
In many countries good health is regarded as the most important human asset. And literally "feeling well" depends more than you think on the quality of the air we permanently inhale. A good room atmosphere increases the achieved living quality considerably, making it "priceless quality of life".
You make quality of life affordable by installing a Pluggit refresh fresh air system, since you provide your tenants with a higher degree of quality of life for a higher rent.