I am having an insulated firebox built and plan on attaching a BBQ GURU to it. I contacted them and they said for a firebox larger then 18X18 you will need two fans. My question is does it need to be two of there 25cfm fans or can I do (1) 25 and (1) 10. Again this will be an insulated firebox with the interior dimensions being 20X20X26 with the basket being 2" off the bottom for air flow.
