There are a several indications you need house ventilation, such as:
1. Enduring odors
If you have trouble getting potent aromas out of your house, you might have a ventilation concern.
2. Musty air
The air in your space should seem fresh, but stale sectors mean you could have inadequate ventilation.
3. Lots of dust
Dust can build up more rapidly in homes with stifled air movement.