What is the CFM rating, and is it strong enough for use with air filter? room is 5X5X7
The CanFan 6" fan with thermostat actually changes speed based on the temperature, but at full blast runs at 413 CFM. It is certainly strong enough to use a filter with, however when temperatures are lower and it slows down, you will see slightly reduced efficiency, though you should not have any blow through on the filter.
The new thermostatic fan is controlled by setting the dial to the desired temperature. The fan has an integrated sensor inside of the fan to sense the temperature of the airflow every 1.5 minutes. When the airflow temperature is warmer than the dial setting, the fan will automatically speed up. If the airflow is cooler then the set point, the fan will automatically slow down. This thermostatic fan will maintain airflow at the low speed until higher speed is required. No remote sensors, no problem!