Nothing is worse than to be in a place that’s poorly ventilated. This is more difficult for people with respiratory problems. I’m sure you’ve been to places like auditoriums or shopping malls and you feel like you’re being choked because of poor ventilation.
To make your clients come back for business make sure that your facility has the right ventilation system. A company called flomerics.com has a unique HVAC design software specifically for building design, with an easy-to-use menu system developed specially for the design and optimization of heating, ventilating and air-conditioning systems. In the US they can be contacted at 508.357.2012 if you have any questions about their product.